Motor home two-way water level detection device

Abstract

The utility model discloses a two-way water level detection device for a motor home, which is characterized in that an RF433 receiving unit is used for receiving a wireless wake-up signal sent by a main control system of the motor home and transmitting the wireless wake-up signal to an MCU (Microprogrammed Control Unit) U1 in the form of a digital signal; the first liquid level acquisition unit is used for acquiring an induction signal of a liquid level sensor connected with the input end of the first liquid level acquisition unit, converting the induction signal into a voltage signal and transmitting the voltage signal to the MCU U1; the second liquid level acquisition unit is used for acquiring an induction signal of a liquid level sensor connected with the input end of the second liquid level acquisition unit, converting the induction signal into a voltage signal and transmitting the voltage signal to the MCU U1; the MCU controller U1 is used for calculating water level values in a black water tank and a grey water tank of the motor home and transmitting the water level values to the RF433 sending unit in a digital signal mode. And the RF433 sending unit is used for converting the digital signal sent by the MCU controller U1 into a wireless signal and sending the wireless signal to a touring car main control system. The utility model has the characteristics that the water tank is convenient to disassemble and assemble, the joint does not need to be repeatedly plugged, water and dust influence is avoided, and the water level detection precision is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to a house car water tank water level detection circuit, especially a house car double-path water level detection device. BACKGROUND

[0002] The black water tank and the grey water tank of the traditional house car are generally installed at the lower part of the house car, and in the prior art, the liquid level sensor in the water tank is directly connected to the control system of the house car through wires so that the control system can monitor the water condition in the water tank, but the installation space near the bottom of the car is narrow, and the water tank needs to be frequently disassembled for waste water disposal and cleaning, so the wired water level sensing device needs to be repeatedly unplugged and plugged when the user disassembles and assembles the water tank, which is very inconvenient in use; at the same time, since the house car is placed outdoors for a long time, there is a lot of water vapor and dust, and the direct insertion connection mode is prone to cause circuit failure, thereby reducing the accuracy of water level detection; in addition, the resistance of the detection circuit is small, and the detection circuit requires small voltage and current, so the small impedance of the plug-in device seriously affects the detection accuracy of the water level; in addition, since the house car is surrounded by a metal shell, if it is necessary to install a cover later, such as adding a water tank or changing the position of the water tank, it is necessary to increase the punching and wiring, which limits the installation and upgrading work. SUMMARY

[0003] The utility model solves the technical problem in the prior art, and provides a house car double-path water level detection device which is convenient to disassemble and assemble, does not need to be repeatedly unplugged and plugged, is not affected by water and dust, and has high water level detection accuracy.

[0004] To solve the above technical problems, the utility model adopts the following technical scheme.

[0005] The utility model provides a house car two -way water level detection device, it includes MCU controller U1, first liquid level acquisition unit, second liquid level acquisition unit, RF433 sending unit and RF433 receiving unit, the input of first liquid level acquisition unit and second liquid level acquisition unit is connected in the liquid level sensor in house car black water tank and grey water tank respectively, the output of first liquid level acquisition unit and second liquid level acquisition unit is connected in MCU controller U1 respectively, the input of RF433 sending unit and the output of RF433 receiving unit are connected in MCU controller U1 respectively, and RF433 sending unit and RF433 receiving unit establish wireless communication with the house car master control system of prearranging, wherein: RF433 receiving unit is used to receive the wireless wake -up signal of house car master control system and is transmitted to MCU controller U1 in the form of digital signal, first liquid level acquisition unit is used to gather the sensing signal of the liquid level sensor of input end, then converts into voltage signal and is transmitted to MCU controller U1, second liquid level acquisition unit is used to gather the sensing signal of the liquid level sensor of input end, then converts into voltage signal and is transmitted to MCU controller U1, MCU controller U1 is used to calculate the water level value in house car black water tank and grey water tank according to the voltage signal of first liquid level acquisition unit and second liquid level acquisition unit output respectively and is transmitted to RF433 sending unit in the form of digital signal, RF433 sending unit is used to convert the digital signal of MCU controller U1 into wireless signal and sends to house car master control system.

[0006] Preferably, the first liquid level acquisition unit includes resistance R2, resistance R3, voltage stabilizing tube ZD1 and capacitor C1, the first end of the resistance R2 and the first end of the capacitor C1 are connected to each other as the input of the first liquid level acquisition unit, the resistance R3 is connected between the second end of the resistance R2 and the ground, the second end of the capacitor C1 is grounded, the cathode of the voltage stabilizing tube ZD1 is connected to the second end of the resistance R2, the anode of the voltage stabilizing tube ZD1 is grounded, and the second end of the resistance R2 is the output of the first liquid level acquisition unit.

[0007] Preferably, the second liquid level acquisition unit includes resistance R6, resistance R8, voltage stabilizing tube ZD2 and capacitor C5, the first end of the resistance R6 and the first end of the capacitor C5 are connected to each other as the input of the second liquid level acquisition unit, the resistance R8 is connected between the second end of the resistance R6 and the ground, the second end of the capacitor C5 is grounded, the cathode of the voltage stabilizing tube ZD2 is connected to the second end of the resistance R6, the anode of the voltage stabilizing tube ZD2 is grounded, and the second end of the resistance R6 is the output of the second liquid level acquisition unit.

[0008] Preferably, the RF433 sending unit comprises an RF433 sending chip U2, a crystal oscillator Y1 and an inductor L1, the crystal oscillator Y1 is connected to a clock end of the RF433 sending chip U2, an input end of the RF433 sending chip U2 is connected to the MCU controller U1 through a resistor R4, and an output end of the RF433 sending chip U2 is connected to a sending antenna ANT1 through the inductor L1.

[0009] Preferably, the RF433 receiving unit comprises an RF433 receiving chip U3, a crystal oscillator Y2, an inductor L2 and an inductor L3, the crystal oscillator Y2 is connected to a clock end of the RF433 receiving chip U3, an output end of the RF433 receiving chip U3 is connected to the MCU controller U1 through a resistor R9, the output end of the RF433 receiving chip U3 is connected to a first end of the inductor L2, a second end of the inductor L2 is grounded, and a first end of the inductor L3 is connected between the first end of the inductor L2 and a capacitor C7, and the first end of the inductor L3 is connected to a receiving antenna ANT2.

[0010] Preferably, the MCU controller U1 is connected with an RS485 communication unit, and the RS485 communication unit comprises a wired interface RJ1, and the wired interface RJ1 is used for being connected to a motor home main control system through a data line.

[0011] In the working process, the motor home main control system first transmits a wireless wake-up signal to the MCU controller U1 through the RF433 receiving unit, so that the MCU controller U1 acquires double-path water level sensor signals, specifically, the first liquid level collecting unit collects the sensing signals of the liquid level sensor connected to the input end thereof, and then converts the sensing signals into voltage signals and transmits the voltage signals to the MCU controller U1, at the same time, the second liquid level collecting unit collects the sensing signals of the liquid level sensor connected to the input end thereof, and then converts the sensing signals into voltage signals and transmits the voltage signals to the MCU controller U1, then the MCU controller U1 calculates the water level values in the motor home black water tank and the motor home gray water tank according to the voltage signals output by the first liquid level collecting unit and the second liquid level collecting unit respectively, the obtained water level values are transmitted to the RF433 sending unit in the form of digital signals, finally, the RF433 sending unit converts the digital signals sent by the MCU controller U1 into wireless signals and sends the wireless signals to the motor home main control system. Compared with the prior art, the motor home double-path water level detection device does not depend on cable transmission of water tank water level signals, not only facilitates disassembly and assembly of the water tank, but also avoids repeated plugging and unplugging of connectors in the operation process, meanwhile, the electronic devices are prevented from being affected by water dust, thereby ensuring high-precision water level detection, and better meeting the application requirements. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1The utility model discloses a house car dual -path water level detection device circuit principle drawing,

[0013] Figure 2 It is circuit principle drawing for RS485 communication unit,

[0014] Figure 3 It is communication flow chart in the utility model preferred embodiment. Specific implementation

[0015] The utility model will be described in more detail below with the combination of drawings and examples.

[0016] The utility model discloses a house car dual -path water level detection device, please see Figure 1 It includes MCU controller U1, first liquid level acquisition unit 1, second liquid level acquisition unit 2, RF433 sending unit 3 and RF433 receiving unit 4, and the input of first liquid level acquisition unit 1 and second liquid level acquisition unit 2 is connected to the liquid level sensor in the house car black water tank and grey water tank respectively, the output of first liquid level acquisition unit 1 and second liquid level acquisition unit 2 is connected to MCU controller U1 respectively, the input of RF433 sending unit 3 and the output of RF433 receiving unit 4 are connected to MCU controller U1 respectively, and RF433 sending unit 3 and RF433 receiving unit 4 establish wireless communication with the preset house car master control system, wherein:

[0017] RF433 receiving unit 4 is used to receive the wireless wake-up signal sent by the house car master control system and is transmitted to MCU controller U1 in the form of digital signal;

[0018] First liquid level acquisition unit 1 is used to collect the sensing signal of the liquid level sensor connected to its input, and then converts into voltage signal and is transmitted to MCU controller U1;

[0019] Second liquid level acquisition unit 2 is used to collect the sensing signal of the liquid level sensor connected to its input, and then converts into voltage signal and is transmitted to MCU controller U1;

[0020] MCU controller U1 is used to calculate the water level value in the house car black water tank and grey water tank according to the voltage signal output by first liquid level acquisition unit 1 and second liquid level acquisition unit 2 respectively and is transmitted to RF433 sending unit 3 in the form of digital signal;

[0021] RF433 sending unit 3 is used to convert the digital signal sent by MCU controller U1 into wireless signal and sends to the house car master control system.

[0022] During the working process of the device, the motor home master control system first transmits a wireless wake-up signal to the MCU controller U1 through the RF433 receiving unit 4, so that the MCU controller U1 acquires double-path water level sensor signals, specifically, the first liquid level collecting unit 1 collects the sensing signals of the liquid level sensor connected to its input end, and then converts the sensing signals into voltage signals and transmits the voltage signals to the MCU controller U1, at the same time, the second liquid level collecting unit 2 collects the sensing signals of the liquid level sensor connected to its input end, and then converts the sensing signals into voltage signals and transmits the voltage signals to the MCU controller U1, and then the MCU controller U1 calculates the water level values in the motor home black water tank and the motor home gray water tank according to the voltage signals output by the first liquid level collecting unit 1 and the second liquid level collecting unit 2 respectively, and the obtained water level values are transmitted to the RF433 sending unit 3 in the form of digital signals, and finally the RF433 sending unit 3 converts the digital signals sent by the MCU controller U1 into wireless signals and sends the wireless signals to the motor home master control system. Compared with the prior art, the water level signal in the water tank is not transmitted by relying on a cable, which not only facilitates the disassembly and assembly of the water tank, but also avoids the need to repeatedly plug and unplug the connector during the operation process, and at the same time, the electronic devices are prevented from being affected by water dust, thereby ensuring high-precision water level detection, and better meeting the application requirements.

[0023] As a preferred mode, the first liquid level collecting unit 1 comprises a resistor R2, a resistor R3, a voltage stabilizing tube ZD1 and a capacitor C1, the first end of the resistor R2 and the first end of the capacitor C1 are connected to each other and serve as the input end of the first liquid level collecting unit 1, the resistor R3 is connected between the second end of the resistor R2 and the ground, the second end of the capacitor C1 is grounded, the cathode of the voltage stabilizing tube ZD1 is connected to the second end of the resistor R2, the anode of the voltage stabilizing tube ZD1 is grounded, and the second end of the resistor R2 serves as the output end of the first liquid level collecting unit 1.

[0024] Please refer to Figure 1 , the first end of the resistor R2 is connected to the power supply end through a pull-up resistor R1, the pull-up resistor R1 is used to enhance the voltage signal strength of the input end of the first liquid level collecting unit 1, and the voltage stabilizing tube ZD1 is used to stabilize the output voltage of the first liquid level collecting unit 1.

[0025] Further, the second liquid level acquisition unit 2 comprises a resistor R6, a resistor R8, a voltage stabilizing tube ZD2 and a capacitor C5, the first end of the resistor R6 and the first end of the capacitor C5 are connected to each other and serve as the input end of the second liquid level acquisition unit 2, the resistor R8 is connected between the second end of the resistor R6 and the ground, the second end of the capacitor C5 is grounded, the cathode of the voltage stabilizing tube ZD2 is connected to the second end of the resistor R6, the anode of the voltage stabilizing tube ZD2 is grounded, and the second end of the resistor R6 serves as the output end of the second liquid level acquisition unit 2.

[0026] For the preferred circuit structure of the transmitting circuit, please refer to Figure 1 The RF433 transmitting unit 3 comprises an RF433 transmitting chip U2, a crystal oscillator Y1 and an inductor L1, the crystal oscillator Y1 is connected to the clock end of the RF433 transmitting chip U2, the input end of the RF433 transmitting chip U2 is connected to the MCU controller U1 through the resistor R4, and the output end of the RF433 transmitting chip U2 is connected to the transmitting antenna ANT1 through the inductor L1.

[0027] In order to realize the wireless signal receiving function, in the embodiment, the RF433 receiving unit 4 comprises an RF433 receiving chip U3, a crystal oscillator Y2, an inductor L2 and an inductor L3, the crystal oscillator Y2 is connected to the clock end of the RF433 receiving chip U3, the output end of the RF433 receiving chip U3 is connected to the MCU controller U1 through the resistor R9, the output end of the RF433 receiving chip U3 is connected to the first end of the inductor L2, the second end of the inductor L2 is grounded, the first end of the inductor L3 is connected between the first end of the inductor L2 and the capacitor C7, and the first end of the inductor L3 is connected to the receiving antenna ANT2.

[0028] The utility model discloses a house car double -way water level detection device, by resistance R1, resistance R2, resistance R3, voltage stabilizing tube ZD1, capacitor C1 constitute a water level resistance -voltage conversion, then send output signal to MCU and carry out AD conversion, calculate corresponding water level value (percentage %) again, and by resistance R5, resistance R6, resistance R7, voltage stabilizing tube ZD2, capacitor C2 constitute another water level resistance -voltage conversion, then carry out AD conversion to MCU, calculate corresponding water level value (percentage %). For the signal transceiver part, RF433 data transmitting circuit is composed of RF433 transmitting chip U2, crystal oscillator Y1, inductor L1, capacitor C1, capacitor C2, capacitor C3 and antenna, and RF433 data receiving circuit is composed of RF433 receiving chip U3, crystal oscillator Y2, inductor L2, inductor L3, capacitor C6, capacitor C7, capacitor C8 and antenna.

[0029] For the convenience of installation and debugging, the embodiment retains the wired transmission mode of sensor data, please refer to Figure 2 The MCU controller U1 is connected with an RS485 communication unit 5, the RS485 communication unit 5 comprises a wired interface RJ1, and the wired interface RJ1 is used for being connected to a motor home main control system through a data line.

[0030] In combination with Figures 1 to 3 The utility model discloses a motor home double -way water level detection device, it has adopted double -way water level sensor detection circuit, has solved motor home black water tank, grey water tank's water level detection accuracy and reliability problem, has selected RF433 wireless communication mode simultaneously, makes its wireless penetration ability stronger, and communication is more stable, simultaneously, the utility model device can be directly installed on the water tank, and when pouring waste water and cleaning water tank does not need to repeatedly plug in the circuit, and the operation process is more convenient, in the specific application, the utility model can use button cell power supply, and the volume is small, and circuit power consumption is low, and based on low -power consumption control mode, is more energy -conserving, and the endurance ability is longer, in addition, the utility model has reserved traditional RS485 wired communication circuit interface, can connect communication line under certain need, thereby realizes direct -connection communication.

[0031] The above is only the preferred embodiment of the utility model, and is not used for limiting the utility model, and all modifications, equivalent replacement or improvement etc. in the technical range of the utility model should be contained in the range of protection of the utility model.

Claims

1. A dual-channel water level detection device for RVs, characterized in that, The MCU controller U1, the first liquid level acquisition unit, the second liquid level acquisition unit, the RF433 sending unit and the RF433 receiving unit are included, the input ends of the first liquid level acquisition unit and the second liquid level acquisition unit are connected to the liquid level sensors in the black water tank and the gray water tank of the motor home respectively, the output ends of the first liquid level acquisition unit and the second liquid level acquisition unit are connected to the MCU controller U1 respectively, the input end of the RF433 sending unit and the output end of the RF433 receiving unit are connected to the MCU controller U1 respectively, and the RF433 sending unit and the RF433 receiving unit establish wireless communication with the preset motor home master control system, wherein: The RF433 receiving unit is used for receiving the wireless wake-up signal sent by the motor home master control system and transmitting to the MCU controller U1 in the form of a digital signal. The first liquid level acquisition unit is used for collecting the sensing signal of the liquid level sensor connected to the input end, and then converting the sensing signal into a voltage signal and transmitting to the MCU controller U1. The second liquid level acquisition unit is used for collecting the sensing signal of the liquid level sensor connected to the input end, and then converting the sensing signal into a voltage signal and transmitting to the MCU controller U1. The MCU controller U1 is used for calculating the water level values in the black water tank and the gray water tank of the motor home according to the voltage signals output by the first liquid level acquisition unit and the second liquid level acquisition unit respectively, and transmitting to the RF433 sending unit in the form of a digital signal. The RF433 sending unit is used for converting the digital signal sent by the MCU controller U1 into a wireless signal and sending to the motor home master control system.

2. The RV dual-path water level detection device of claim 1, wherein, The first liquid level acquisition unit includes a resistor R2, a resistor R3, a Zener diode ZD1 and a capacitor C1, the first end of the resistor R2 and the first end of the capacitor C1 are connected to each other as the input end of the first liquid level acquisition unit, the resistor R3 is connected between the second end of the resistor R2 and the ground, the second end of the capacitor C1 is grounded, the cathode of the Zener diode ZD1 is connected to the second end of the resistor R2, the anode of the Zener diode ZD1 is grounded, and the second end of the resistor R2 is the output end of the first liquid level acquisition unit.

3. The RV dual-path water level detection device of claim 1, wherein, The second liquid level acquisition unit includes a resistor R6, a resistor R8, a Zener diode ZD2 and a capacitor C5, the first end of the resistor R6 and the first end of the capacitor C5 are connected to each other as the input end of the second liquid level acquisition unit, the resistor R8 is connected between the second end of the resistor R6 and the ground, the second end of the capacitor C5 is grounded, the cathode of the Zener diode ZD2 is connected to the second end of the resistor R6, the anode of the Zener diode ZD2 is grounded, and the second end of the resistor R6 is the output end of the second liquid level acquisition unit.

4. The RV dual-path water level detection device of claim 1, wherein, The RF433 transmitting unit comprises an RF433 transmitting chip U2, a crystal oscillator Y1 and an inductor L1, the crystal oscillator Y1 is connected to a clock end of the RF433 transmitting chip U2, an input end of the RF433 transmitting chip U2 is connected to the MCU controller U1 through a resistor R4, and an output end of the RF433 transmitting chip U2 is connected to a transmitting antenna ANT1 through the inductor L1.

5. The RV dual-path water level detection device of claim 1, wherein, The RF433 receiving unit comprises an RF433 receiving chip U3, a crystal oscillator Y2, an inductor L2 and an inductor L3, the crystal oscillator Y2 is connected to a clock end of the RF433 receiving chip U3, an output end of the RF433 receiving chip U3 is connected to the MCU controller U1 through a resistor R9, the output end of the RF433 receiving chip U3 is connected to a first end of the inductor L2, a second end of the inductor L2 is grounded, a first end of the inductor L3 is connected to the first end of the inductor L2 through a capacitor C7, and the first end of the inductor L3 is connected to a receiving antenna ANT2.

6. The RV dual-path water level detection device of claim 1, wherein, The MCU controller U1 is connected with an RS485 communication unit, the RS485 communication unit comprises a wired interface RJ1, and the wired interface RJ1 is used for being connected to a motor home main control system through a data line.

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