Solar power supply circuit, swimming pool temperature sensor, air humidity instrument and environment detection device

Abstract

The invention discloses a solar power supply circuit, a swimming pool temperature sensor, an air hygrograph and an environment detection device.The solar power supply circuit comprises a solar panel, an energy storage capacitor, a first low-voltage detection chip, a voltage stabilization unit and a processor chip, and the positive electrode end and the negative electrode end of the solar panel are electrically connected with the two ends of the energy storage capacitor respectively; the positive electrode end of the solar panel is electrically connected with the input end of the first low-voltage detection chip, the output end of the first low-voltage detection chip is electrically connected with the input end of the voltage stabilizing unit, and the output end of the voltage stabilizing unit is electrically connected with the positive electrode of a power source of the processor chip. The negative electrode end of the solar panel, the grounding end of the first low-voltage detection chip and the grounding end of the voltage stabilizing unit are electrically connected with the power source negative electrode of the processor chip, and the problem that when the electric quantity of an existing solar panel is low, the normal working time is long is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of solar power supply circuits, and in particular to a solar power supply circuit, a swimming pool temperature sensor, an air humidity meter and an environment detection device. Background Art

[0002] Existing solar circuits generally generate electricity from solar energy through solar panels and then store the electricity in batteries. Under the same light, the size of the solar panel (or solar panel) determines the amount of electricity generated by the solar panel. When solar panels are installed on some smaller devices, such as temperature sensors, air humidity meters and other devices, the size of the solar panel is limited and cannot generate too much electricity. At this time, if the solar panel is to directly drive the circuit to work, the circuit has not yet worked properly due to the low power of the solar panel, but the circuit that is not working properly will continue to consume power, thus extending the time required for normal operation. Especially when the battery is out of power, if the battery needs to be charged, the working time of the circuit will be further extended. Summary of the invention

[0003] Therefore, it is necessary to provide a solar power supply circuit, a swimming pool temperature sensor, an air humidity meter and an environmental detection device to solve the problem that when the power of the existing solar panels is low, the normal working time is long.

[0004] To achieve the above-mentioned purpose, the present invention provides a solar power supply circuit, including a solar panel, an energy storage capacitor, a first low voltage detection chip, a voltage stabilizing unit and a processor chip, wherein the positive terminal and the negative terminal of the solar panel are electrically connected to the two ends of the energy storage capacitor respectively, the positive terminal of the solar panel is electrically connected to the input end of the first low voltage detection chip, the output end of the first low voltage detection chip is electrically connected to the input end of the voltage stabilizing unit, the output end of the voltage stabilizing unit is electrically connected to the positive power supply of the processor chip, the negative terminal of the solar panel, the ground terminal of the first low voltage detection chip, the ground terminal of the voltage stabilizing unit and the negative power supply of the processor chip are electrically connected, and the first low voltage detection chip is used to detect that the voltage of the input end is greater than a first voltage preset value and then output the electric energy of the input end from the output end, and the first voltage preset value is greater than the minimum operating voltage of the processor chip.

[0005] The present invention also provides an environment detection device, comprising a shell, a circuit board, an environment detection sensor and a display screen, wherein the circuit board is placed in the shell, and the circuit board is provided with a solar power supply circuit as described in any one of the embodiments of the present invention, and the solar panel of the solar power supply circuit is arranged on the shell, and the detection data end of the processor chip of the solar power supply circuit is electrically connected to the data end of the environment detection sensor, and the display data end of the processor chip of the solar power supply circuit is electrically connected to the data end of the display screen, the environment detection sensor and the display screen are arranged on the shell, and the processor chip is used to obtain data from the environment detection sensor and display it on the display screen.

[0006] Different from the prior art, the above technical solution can store the electricity of the solar panel in time through the energy storage capacitor, and then through the first low voltage detection chip, when the voltage stored in the energy storage capacitor of the solar panel has not reached the first voltage preset value, no voltage output is performed, so as to avoid the processor chip being unable to work normally or repeatedly restarting and wasting electric energy due to too low voltage, and then output is performed when the voltage of the energy storage capacitor reaches the first voltage preset value, so that the processor chip can start working normally immediately, reducing the time required to enter normal operation. In this way, the processor chip is prevented from consuming the electric energy of the solar panel when the voltage does not reach the working voltage, and the problem of the existing solar panel taking a long time to enter normal operation when the power is low is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 A circuit diagram according to an embodiment;

[0008] Figure 2 A circuit diagram of another embodiment;

[0009] Figure 3 A circuit diagram according to another embodiment;

[0010] Figure 4 A circuit diagram of yet another embodiment;

[0011] Figure 5 A circuit diagram of a processor chip according to one embodiment. DETAILED DESCRIPTION

[0012] In order to explain the technical content, structural features, achieved objectives and effects of the technical solution in detail, the following is a detailed description in conjunction with specific embodiments and accompanying drawings.

[0013] See also Figure 1The present invention provides a solar power supply circuit, including a solar panel S1, an energy storage capacitor C8, a first low voltage detection chip U6, a voltage stabilizing unit U5 and a processor chip U1, wherein the positive terminal and the negative terminal of the solar panel S1 are electrically connected to the two ends of the energy storage capacitor C8 respectively, the positive terminal of the solar panel S1 is electrically connected to the input end of the first low voltage detection chip U6, the output end of the first low voltage detection chip U6 is electrically connected to the input end of the voltage stabilizing unit U5, the output end of the voltage stabilizing unit U5 is electrically connected to the positive power supply of the processor chip, the negative terminal VDD of the solar panel S1, the ground end of the first low voltage detection chip U6, the ground end of the voltage stabilizing unit U5 and the positive power supply of the processor chip are electrically connected, the first low voltage detection chip U6 is used to detect that the voltage of the input end is greater than a first voltage preset value and then output the electric energy of the input end from the output end, and the first voltage preset value is greater than the minimum working voltage of the processor chip.

[0014] The solar panel S1 is used to convert solar energy into electrical energy for output. The energy storage capacitor C8 can immediately store the electrical energy of the solar panel S1. The first low voltage detection chip U6 is used to detect that the voltage at the input end (i.e., the voltage of the energy storage capacitor C8) is greater than the first voltage preset value and then output the electrical energy at the input end from the output end. After the output end of the first low voltage detection chip U6 outputs electrical energy, the voltage stabilizing unit U5 obtains electrical energy and starts working, and outputs a stable voltage to the processor chip U1 for use. Figure 1 and Figure 5 As shown, the voltage stabilizing unit U5 outputs a voltage VDD1.2 for the processor chip U1. The voltage stabilizing unit may be an LDO voltage stabilizing chip or a DC-DC voltage stabilizing chip, preferably the LDO voltage stabilizing chip in the figure, and the processor chip U1 is a programmable chip, such as an MCU. It should be noted that the minimum operating voltage of the processor chip refers to the minimum voltage at which the processor chip can start and operate stably, such as the minimum operating voltage of the processor chip can be 1.2V. The first voltage preset value needs to be at least greater than the minimum operating voltage, such as 1.3V, or a higher voltage, such as 1.5V. In this way, the voltage stabilizing unit U5 can output a voltage that meets the minimum operating voltage of the processor chip, so that the processor chip U1 can work normally. In this way, when the voltage stored in the energy storage capacitor of the solar panel has not reached the first voltage preset value, the voltage output is not performed, so as to avoid the low voltage from preventing the processor chip U1 from working normally and wasting electric energy, and then when the voltage of the energy storage capacitor reaches the first voltage preset value, the output is performed, so that the processor chip can start working normally immediately, reducing the time required to enter normal work. This prevents the processor chip from consuming the power of the solar panel when the voltage does not reach the working voltage, and solves the problem that the normal working time is longer when the power of the existing solar panel is low.

[0015] The above embodiment can directly provide the electric energy of the solar panel to the processor chip U1 for operation. In some embodiments, the excess electric energy of the solar panel can also be stored. Figure 2 As shown, it also includes a first diode D1, a second diode D2, a third diode D3, a charging control unit 10 and an energy storage unit. The output end of the first low voltage detection chip U6 is electrically connected to the input end of the voltage stabilizing unit U5, including: the output end of the first low voltage detection chip U6 is electrically connected to the positive end of the third diode D3, and the negative end of the third diode D3 is electrically connected to the input end of the voltage stabilizing unit U5. The third diode D3 can prevent the current from flowing back to the first low voltage detection chip U6 when the solar panel S1 is out of power, and avoid the reverse outflow of electric energy and waste of electric energy. The positive end of the solar panel S1 is also electrically connected to the positive pole of the first diode D1, the negative pole of the first diode D1 is electrically connected to the input end of the charging control unit 10, the output end of the charging control unit 10 is electrically connected to the positive end of the energy storage unit and the positive pole of the second diode, the negative pole of the second diode is electrically connected to the negative pole of the third diode D3 and the input end of the voltage stabilizing unit U5, and the negative pole of the energy storage unit is electrically connected to the negative pole of the solar panel. The charging control unit 10 is used to reduce the electric energy at the input end and control the charging current as the voltage at the input end decreases after the voltage at the input end is greater than the second voltage preset value, the second voltage preset value is greater than the first voltage preset value, and the energy storage unit is a capacitor C9 or a rechargeable battery BAT+. The capacity of the capacitor C9 can be greater than the energy storage capacitor C8 to achieve more energy storage, the rechargeable battery can be a lithium battery, a nickel-hydrogen battery, etc., and the charging voltage can include 1.5V.

[0016] The second voltage preset value is greater than the first voltage preset value, such as 1.5V, so that the circuit of the present invention first ensures the operation of the processor chip. Then, after the voltage is higher, the charging control unit 10 starts charging. At the same time, the charging control unit 10 can control the charging current to decrease as the voltage at the input end decreases. When the voltage of the solar panel S1 is still relatively small, the charging current is small to avoid excessive loss of electric energy. Then, when the voltage of the solar panel S1 is still relatively large, the charging current is large, and more electric energy can be charged to the energy storage unit. Then, when the solar panel S1 has no power and the energy storage unit has power, the power of the energy storage unit can flow from the second diode to the voltage stabilizing unit U5, so that the energy storage unit can supply power to the processor chip U1. This embodiment ensures that the excess power can be stored in the energy storage unit, and can also ensure that when the power of the solar panel S1 is low, the processor chip is powered first, so as to ensure the operation of the processor chip first.

[0017] Furthermore, in order to avoid the situation where the voltage of the energy storage unit is too low when the energy storage unit is used alone, the processor chip may not be able to work normally. Figure 3 As shown, in Figure 2 On the basis of, the present invention also includes a second low voltage detection chip U7. The output end of the charging control unit 10 is electrically connected to the positive end of the energy storage unit and the positive pole of the second diode D2, including: the output end of the charging control unit 10 is electrically connected to the positive end of the energy storage unit and the input end of the second low voltage detection chip U7, the output end of the second low voltage detection chip U7 is electrically connected to the positive pole of the second diode D2, the ground end of the second low voltage detection chip U7 is electrically connected to the negative pole of the solar panel S1, and the second low voltage detection chip U7 can be the same chip as the first low voltage detection chip. In this way, the low voltage detection chip can ensure that electrical energy is provided to the voltage stabilizing unit only after the voltage of the energy storage unit is greater than the first voltage preset value, and then to the processor chip for use. It can ensure the normal operation of the processor chip when the energy storage unit is used alone, and avoid the situation where the processor chip cannot work normally due to too low voltage and then consumes electrical energy.

[0018] Furthermore, if Figure 4 As shown, in order to store the excess electric energy of the solar panel, the present invention also includes a first diode D1, a second diode D2, a third diode D3, a charging control unit 10 and an energy storage unit; the positive terminal of the solar panel S1 is electrically connected to the input terminal of the first low voltage detection chip U6, including: the positive terminal of the solar panel S1 is electrically connected to the positive terminal of the third diode D3, and the negative terminal of the third diode D3 is electrically connected to the input terminal of the first low voltage detection chip U6; the positive terminal of the solar panel S1 is also electrically connected to the positive terminal of the first diode D1, and the negative terminal of the first diode D1 is electrically connected to the charging control unit 10. The input end of the charging control unit 10 is electrically connected, the output end of the charging control unit 10 is electrically connected to the positive end of the energy storage unit and the positive end of the second diode D2, the negative end of the second diode D2 is electrically connected to the negative end of the third diode and the input end of the first low voltage detection chip U6, and the negative end of the energy storage unit is electrically connected to the negative end of the solar panel; the charging control unit 10 is used to reduce the electric energy at the input end and control the charging current as the voltage at the input end decreases after the voltage at the input end is greater than the second voltage preset value, the second voltage preset value is greater than the first voltage preset value, and the energy storage unit is a capacitor or a rechargeable battery.

[0019] In this way, the charging control unit 10 starts charging only after the voltage of the solar panel is high. At the same time, the charging control unit 10 can control the charging current to decrease as the voltage at the input end decreases. When the voltage of the solar panel S1 is still relatively small, the charging current is small to avoid excessive loss of electric energy. Then, when the voltage of the solar panel S1 is still relatively large, the charging current is large, and more electric energy can be charged to the energy storage unit. Then, when the solar panel S1 has no power but the energy storage unit has power, the power of the energy storage unit can flow from the second diode D2 to the first low voltage detection chip and then to the voltage stabilizing unit U5, so that the energy storage unit can supply power to the processor chip U1. This embodiment ensures that excess power can be stored in the energy storage unit, and can also ensure that when the power of the solar panel S1 is low, the processor chip is powered first, so that the operation of the processor chip is guaranteed first.

[0020] The charging control unit 10 of the present invention can be implemented as long as it meets the control requirements of the present invention, such as by using a separate chip or discrete components. Figures 2 to 4 As shown, the charging control unit 10 includes an NPN transistor Q4, a first voltage-dividing resistor R6 and a second voltage-dividing resistor R7. The collector of the NPN transistor Q4 is electrically connected to one end of the first voltage-dividing resistor R6 as the input end of the charging control unit 10, the base of the NPN transistor Q4 is electrically connected to the other end of the first voltage-dividing resistor R6 and one end of the second voltage-dividing resistor R7, and the other end of the second voltage-dividing resistor R7 is electrically connected to the emitter of the NPN transistor Q4 as the output end of the charging control unit 10. At this time, the second voltage preset value of the charging control unit 10 satisfies the following formula: V2=V3*(R1+R2) / R2. Wherein V2 is the second voltage preset value, V3 is the NPN transistor conduction voltage, R1 is the resistance value of the first voltage-dividing resistor R6, and R2 is the resistance value of the second voltage-dividing resistor R7. When the voltage difference between the input end and the output end of the charging control unit 10 reaches the turn-on voltage of the NPN transistor Q4 after passing through the voltage-dividing resistor, charging can be started. As the voltage at the input end of the charging control unit 10 increases, the charging current increases, thereby meeting the charging control requirements.

[0021] Furthermore, if Figure 1 As shown, a third diode D3 is also included, and the positive terminal of the solar panel S1 is electrically connected to the input terminal of the first low voltage detection chip U6 through the third diode D3, or the output terminal of the first low voltage detection chip U6 is electrically connected to the input terminal of the voltage stabilizing unit U5 through the third diode D3. The third diode D3 can prevent the current from flowing back to the first low voltage detection chip U6 when the solar panel S1 is out of power, thereby preventing the reverse outflow of electric energy and wasting electric energy.

[0022] Furthermore, it also includes a monochrome display screen, a temperature sensor or a humidity sensor, and the data end of the monochrome display screen, the temperature sensor or the humidity sensor is electrically connected to the data end of the processor chip U1. The monochrome display screen consumes less power and can meet the display under low power consumption conditions, reducing the time required for display.

[0023] Furthermore, the capacity of the energy storage capacitor C8 is 200uf to 1500uf, preferably 470uf; such a small capacity of the energy storage capacitor can quickly boost the voltage to reach the voltage required for the processor chip to start up. Of course, it should not be too small to avoid a rapid drop in voltage after the first low voltage detection chip is turned on.

[0024] And the processor chip is preferably a low-power chip, and the minimum operating current of the processor chip U1 (that is, the minimum current required for the processor chip to run) is less than 9uA, preferably less than 5uA; this can achieve rapid startup of the processor chip.

[0025] And, in some embodiments, the area of ​​the solar panel S1 is less than 24 square centimeters (i.e., the size is less than 30mm*80mm or less than 40mm*50mm), or the size of the solar panel S1 is 38mm*13mm, 35mm*14mm, 46mm*16mm, 55mm*14mm, 55mm*18mm or 60mm*30mm. The solar panel has a smaller area and can be used on smaller devices, thereby enabling the processor chip of the smaller device to start quickly.

[0026] Furthermore, after the processor chip is started, the main program in the processor chip waits for a first preset time before entering the working mode. The main program can be the main main program, and at this time, the external unit module connected to the processor chip is not initialized, driven or detected. After power-on, by waiting for a period of time, more electric energy can be stored to avoid the situation where the voltage drops rapidly after the power is used too quickly when the work is started at the beginning.

[0027] The present invention provides a swimming pool temperature sensor, including a housing, a circuit board, a thermistor and a display screen. The circuit board is placed in the housing. The circuit board is provided with a solar power supply circuit of any one of the embodiments of the present invention. The solar panel of the solar power supply circuit is arranged on the housing. The detection data end of the processor chip of the solar power supply circuit is electrically connected to the data end of the thermistor. The display data end of the processor chip U1 of the solar power supply circuit is electrically connected to the data end of the display screen. The thermistor and the display screen are arranged on the housing. The processor chip U1 is used to obtain data from the thermistor and display it on the display screen. The thermistor can be a thermistor (such as Figure 5The temperature sensor can detect and display the temperature of the swimming pool. After the solar panel receives light, the voltage of the energy storage capacitor reaches the first preset voltage value, so that the processor chip can start normal operation immediately, reducing the time required to enter normal operation and realizing rapid display of temperature.

[0028] The present invention provides an air humidity meter, including a housing, a circuit board, a humidity sensor and a display screen. The circuit board is placed in the housing. The circuit board is provided with a solar power supply circuit of any one of the embodiments of the present invention. The solar panel S1 of the solar power supply circuit is arranged on the housing. The detection data end of the processor chip U1 of the solar power supply circuit is electrically connected to the data end of the humidity sensor. The display data end of the processor chip U1 of the solar power supply circuit is electrically connected to the data end of the display screen. The humidity sensor and the display screen are arranged on the housing. The processor chip U1 is used to obtain the data of the humidity sensor and display it on the display screen. The humidity sensor can be a humidity sensitive resistor (such as Figure 5 The humidity sensing resistor RT) or humidity detection chip in the environment detection circuit 20 can detect and display the environmental humidity. After the solar panel receives light, the humidity meter outputs when the voltage of the energy storage capacitor reaches the first voltage preset value, so that the processor chip can start normal operation immediately, reducing the time required to enter normal operation and realizing rapid display of humidity.

[0029] The present invention provides an environment detection device, including a housing, a circuit board, an environment detection sensor and a display screen. The circuit board is placed in the housing. The circuit board is provided with a solar power supply circuit of any one of the embodiments of the present invention. The solar panel S1 of the solar power supply circuit is arranged on the housing. The detection data end of the processor chip U1 of the solar power supply circuit is electrically connected to the data end of the environment detection sensor. The display data end of the processor chip U1 of the solar power supply circuit is electrically connected to the data end of the display screen. The environment detection sensor and the display screen are arranged on the housing. The processor chip U1 is used to obtain data from the environment detection sensor and display it on the display screen. The environment detection sensor can be as follows: Figure 5 The environment detection circuit 20 shown in the figure may be a thermistor (temperature sensor) or a humidity sensor, such as Figure 5 The device uses a thermistor RH or a humidity-sensitive resistor RT. After the solar panel receives light, the voltage of the energy storage capacitor reaches a first preset voltage value, and outputs an output, so that the processor chip can start normal operation immediately, reducing the time required to enter normal operation and realizing rapid display of environmental parameters.

[0030] It should be noted that, although the above embodiments have been described in this article, the patent protection scope of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, changes and modifications made to the embodiments described herein, or equivalent structures or equivalent process changes made using the contents of the present invention specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields, are all included in the patent protection scope of the present invention.

Claims

1. A solar power supply circuit, characterized in that: It includes a solar panel, an energy storage capacitor, a first low voltage detection chip, a voltage stabilizing unit and a processor chip, wherein the positive terminal and the negative terminal of the solar panel are electrically connected to the two ends of the energy storage capacitor respectively, the positive terminal of the solar panel is electrically connected to the input terminal of the first low voltage detection chip, the output terminal of the first low voltage detection chip is electrically connected to the input terminal of the voltage stabilizing unit, the output terminal of the voltage stabilizing unit is electrically connected to the positive power supply terminal of the processor chip, the negative terminal of the solar panel, the ground terminal of the first low voltage detection chip, the ground terminal of the voltage stabilizing unit and the negative power supply terminal of the processor chip are electrically connected, and the first low voltage detection chip is used to detect that the voltage of the input terminal is greater than a first voltage preset value and then output the electric energy of the input terminal from the output terminal, and the first voltage preset value is greater than the minimum operating voltage of the processor chip.

2. A solar power supply circuit according to claim 1, characterized in that: It also includes a first diode, a second diode, a third diode, a charging control unit and an energy storage unit; The output end of the first low voltage detection chip is electrically connected to the input end of the voltage stabilizing unit, including: the output end of the first low voltage detection chip is electrically connected to the positive end of the third diode, and the negative end of the third diode is electrically connected to the input end of the voltage stabilizing unit; The positive terminal of the solar panel is also electrically connected to the positive terminal of the first diode, the negative terminal of the first diode is electrically connected to the input terminal of the charging control unit, the output terminal of the charging control unit is electrically connected to the positive terminal of the energy storage unit and the positive terminal of the second diode, the negative terminal of the second diode is electrically connected to the negative terminal of the third diode and the input terminal of the voltage stabilizing unit, and the negative terminal of the energy storage unit is electrically connected to the negative terminal of the solar panel; The charging control unit is used to reduce the electric energy at the input end and control the charging current as the voltage at the input end decreases after the voltage at the input end is greater than a second voltage preset value. The second voltage preset value is greater than the first voltage preset value. The energy storage unit is a capacitor or a rechargeable battery.

3. A solar power supply circuit according to claim 2, characterized in that: Also includes a second low voltage detection chip; The output end of the charging control unit is electrically connected to the positive end of the energy storage unit and the positive electrode of the second diode, including: The output end of the charging control unit is electrically connected to the positive terminal of the energy storage unit and the input end of the second low voltage detection chip, the output end of the second low voltage detection chip is electrically connected to the positive electrode of the second diode, and the ground end of the second low voltage detection chip is electrically connected to the negative terminal of the solar panel.

4. A solar power supply circuit according to claim 1, characterized in that: It also includes a first diode, a second diode, a third diode, a charging control unit and an energy storage unit; The positive terminal of the solar panel is electrically connected to the input terminal of the first low voltage detection chip, including: The positive terminal of the solar panel is electrically connected to the positive terminal of the third diode, the negative terminal of the third diode is electrically connected to the input terminal of the first low voltage detection chip, and the negative terminal of the energy storage unit is electrically connected to the negative terminal of the solar panel; The positive terminal of the solar panel is also electrically connected to the positive terminal of the first diode, the negative terminal of the first diode is electrically connected to the input terminal of the charging control unit, the output terminal of the charging control unit is electrically connected to the positive terminal of the energy storage unit and the positive terminal of the second diode, and the negative terminal of the second diode is electrically connected to the negative terminal of the third diode and the input terminal of the first low voltage detection chip; The charging control unit is used to reduce the electric energy at the input end and control the charging current as the voltage at the input end decreases after the voltage at the input end is greater than a second voltage preset value. The second voltage preset value is greater than the first voltage preset value. The energy storage unit is a capacitor or a rechargeable battery.

5. A solar power supply circuit according to any one of claims 2 to 4, characterized in that: The charging control unit includes an NPN transistor, a first voltage-dividing resistor and a second voltage-dividing resistor. The collector of the NPN transistor is electrically connected to one end of the first voltage-dividing resistor and serves as the input end of the charging control unit. The base of the NPN transistor is electrically connected to the other end of the first voltage-dividing resistor and one end of the second voltage-dividing resistor. The other end of the second voltage-dividing resistor is electrically connected to the emitter of the NPN transistor and serves as the output end of the charging control unit.

6. A solar power supply circuit according to claim 1, characterized in that: It also includes a third diode, through which the positive terminal of the solar panel is electrically connected to the input terminal of the first low voltage detection chip, or the output terminal of the first low voltage detection chip is electrically connected to the input terminal of the voltage stabilizing unit.

7. A solar power supply circuit according to any one of claims 1 to 4 and 6, characterized in that: It also includes a monochrome display screen, a temperature sensor or a humidity sensor, and the data end of the monochrome display screen, the temperature sensor or the humidity sensor is electrically connected to the data end of the processor chip.

8. A solar power supply circuit according to any one of claims 1 to 4 and 6, characterized in that: The capacity of the energy storage capacitor is 200uf to 1500uf, preferably 470uf; or: The minimum operating current of the processor chip is less than 9uA, preferably less than 5uA; or: The area of ​​the solar panel is less than 24 square centimeters or the size of the solar panel is 38mm*13mm, 35mm*14mm, 46mm*16mm, 55mm*14mm, 55mm*18mm or 60mm*30mm.

9. A solar power supply circuit according to any one of claims 1 to 4 and 6, characterized in that: After the processor chip is started, the main program in the processor chip waits for a first preset time before entering the working mode.

10. A swimming pool temperature sensor, comprising a housing, a circuit board, a thermistor and a display screen, wherein the circuit board is placed in the housing, and the circuit board is provided with a solar power supply circuit as claimed in any one of claims 1 to 9, wherein the solar panel of the solar power supply circuit is arranged on the housing, the detection data end of the processor chip of the solar power supply circuit is electrically connected to the data end of the thermistor, the display data end of the processor chip of the solar power supply circuit is electrically connected to the data end of the display screen, the thermistor and the display screen are arranged on the housing, and the processor chip is used to obtain data from the thermistor and display it on the display screen.

11. An air humidity meter, comprising a shell, a circuit board, a humidity sensor and a display screen, wherein the circuit board is placed in the shell, and the circuit board is provided with a solar power supply circuit as claimed in any one of claims 1 to 9, wherein the solar panel of the solar power supply circuit is arranged on the shell, the detection data end of the processor chip of the solar power supply circuit is electrically connected to the data end of the humidity sensor, the display data end of the processor chip of the solar power supply circuit is electrically connected to the data end of the display screen, the humidity sensor and the display screen are arranged on the shell, and the processor chip is used to obtain data from the humidity sensor and display it on the display screen.

12. An environmental detection device, characterized in that: The invention comprises a shell, a circuit board, an environment detection sensor and a display screen, wherein the circuit board is placed in the shell, and the circuit board is provided with a solar power supply circuit according to any one of claims 1 to 9, and the solar panel of the solar power supply circuit is arranged on the shell, and the detection data end of the processor chip of the solar power supply circuit is electrically connected to the data end of the environment detection sensor, and the display data end of the processor chip of the solar power supply circuit is electrically connected to the data end of the display screen, the environment detection sensor and the display screen are arranged on the shell, and the processor chip is used to obtain data of the environment detection sensor and display it on the display screen.

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