A low-power, high-precision wireless temperature transmitter
The low-power, high-precision wireless temperature transmitter solves the problems of insufficient single-point monitoring coverage and high maintenance costs in oilfield monitoring, and realizes high-precision and real-time data transmission for multi-area temperature monitoring. It is adaptable to complex terrain environments and reduces communication construction costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU JIECHUANG SCI & TECH CO LTD
- Filing Date
- 2025-05-30
- Publication Date
- 2026-07-31
AI Technical Summary
Existing temperature transmitters in oilfield monitoring suffer from problems such as single-point monitoring failing to cover multiple areas, insufficient accuracy, and high maintenance costs.
The temperature transmitter, which employs low-power, high-precision wireless transmission, includes multiple temperature sensors, an ADC module, an MCU main control chip, a multi-channel gating analog switch chip, a wireless transmission module, and a power supply module. It is powered by a solar panel and a lithium battery, enabling multi-point temperature monitoring and real-time remote data transmission.
It improves the selectivity and accuracy of temperature monitoring, reduces maintenance costs, enables real-time remote monitoring and efficient and convenient management of data, adapts to complex terrain environments, and reduces communication construction costs.
Smart Images
Figure CN224581037U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of temperature monitoring, and in particular to a low-power, high-precision wireless transmission temperature transmitter. Background Technology
[0002] Temperature measurement plays a crucial role in oilfield monitoring. The temperature condition of an oil reservoir is closely related to many aspects, including oilfield extraction efficiency, equipment operating status, and subsequent production. During oilfield extraction, reservoir temperature directly affects the flow characteristics of oil and gas. Higher reservoir temperatures typically reduce crude oil viscosity, facilitating oil and gas flow and thus improving recovery rates. Conversely, abnormal temperature changes may indicate dynamic changes within the reservoir, such as oil-water boundary advancement or gas cap intrusion. For oilfield extraction equipment, temperature variations impact material properties, service life, and normal operation, ultimately affecting production efficiency and even potentially causing safety accidents.
[0003] In the field of oilfield monitoring, traditional temperature measurement methods often rely on manual on-site detection or simple sensor installation. Manual measurement is greatly limited by environmental conditions. For example, in offshore oilfields or harsh onshore oilfields, it is difficult for personnel to frequently go deep into the field to measure the temperature, making it difficult to guarantee the timeliness and accuracy of the data. Furthermore, single-point monitoring cannot cover multiple areas (such as different depths of oil wells or equipment clusters), cannot capture temperature abrupt changes in other areas, and lacks global temperature field analysis, leading to safety hazards. In addition, power supply and communication rely on wired connections or frequent power swaps, resulting in high maintenance costs in remote scenarios. Utility Model Content
[0004] Therefore, the technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology, such as the inability of single-point monitoring of temperature transmitters to cover multiple areas, high maintenance costs, and insufficient accuracy.
[0005] To address the aforementioned technical problems, this utility model provides a low-power, high-precision wireless temperature transmitter, comprising:
[0006] Multiple temperature sensors are installed at different depths inside the pipeline in the oilfield to be tested.
[0007] The ADC module connects to multiple temperature sensors via a multi-channel analog switch chip to acquire electrical signals from the temperature sensors and convert them into digital signals.
[0008] The MCU main control chip is connected to the multiplexer analog switch chip and the ADC module. It is used to generate binary signals and transmit them to the multiplexer analog switch chip; and to receive the digital signals output by the ADC module.
[0009] A multi-channel analog switch chip is used to turn on or off the signal path between the output of a preset temperature sensor and the input of an ADC module based on binary signals.
[0010] The wireless transmission module is connected to the MCU main control chip and the aggregation point of the oil field under test, and is used to transmit the digital signals received by the MCU main control chip to the aggregation point of the oil field under test.
[0011] The power supply module is connected to the ADC module, MUC main control chip, multi-channel selection analog switch chip, and wireless transmission module.
[0012] Preferably, the power supply module includes:
[0013] The solar panel's output is connected to the lithium battery via a charging management circuit.
[0014] The lithium battery is connected to the ADC module, MUC main control chip, multi-channel selection analog switch chip, and wireless transmission module through a voltage regulator chip.
[0015] Preferably, the power supply module further includes an insulation layer that wraps around the outer surface of the lithium battery casing.
[0016] Preferably, the insulation layer is any one of polyurethane foam, extruded polystyrene, or ceramic fiber.
[0017] Preferably, it further includes:
[0018] The switch control circuit is connected to the MCU main control chip and is used to receive the power-off signal of the MCU main control chip; it is connected to the multiplexer analog switch chip, ADC module, wireless transmission module and power supply module. When the switch control circuit is turned on, the power supply provides power to the multiplexer analog switch chip, ADC module and wireless transmission module.
[0019] The switch control circuit includes:
[0020] The transistor's base is connected to the GPIO pin of the MCU main control chip, and its emitter is grounded;
[0021] The source of a MOSFET is connected to the power supply output terminal, the drain is connected to the power input terminal of a multi-channel analog switch chip, ADC module, or wireless transmission module, and the gate is connected to the collector of a transistor.
[0022] Preferably, the ADC module uses a 24-bit sampling chip.
[0023] Preferably, the wireless transmission module is either a LoRa module or a 4G module.
[0024] Preferably, when the wireless transmission module is a LoRa module, the digital signal received by the MCU main control chip is transmitted to the gateway of the oil field to be tested;
[0025] When the wireless transmission module is a 4G module, it transmits the digital signals received by the MCU main control chip to the server of the oil field under test.
[0026] Preferably, the MCU main control chip further includes:
[0027] A comparator is used to compare the received digital signal with a preset threshold value.
[0028] Preferably, the multi-channel selection analog switch chip is any one of SGM4782, CD4051, or 74HC4051.
[0029] Preferably, the temperature sensor is either a resistance temperature sensor or a semiconductor temperature sensor.
[0030] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:
[0031] This invention discloses a low-power, high-precision wireless temperature transmitter. An MCU main control chip generates switching signals to control a multi-channel selection analog switch chip, enabling flexible connection and disconnection of signal paths between multiple temperature sensors and an ADC module. This ensures the ADC module accurately acquires electrical signals from the target sensors, effectively improving the selectivity and accuracy of temperature monitoring. Simultaneously, the wireless transmission module enables real-time remote data transmission, facilitating centralized management and significantly improving data transmission efficiency and remote monitoring convenience. The power supply module provides stable power to all modules, ensuring continuous system operation. Furthermore, this temperature transmitter is powered by solar energy and a battery, resulting in extremely low power consumption. It can operate in low-temperature environments, perform high-precision temperature measurements, and wirelessly transmit the measured temperature data. Attached Figure Description
[0032] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.
[0033] Figure 1 This is a structural block diagram of a low-power, high-precision wireless temperature transmitter according to the present invention.
[0034] Figure 2 This is a system architecture diagram of a temperature transmitter.
[0035] Figure 3 This is a structural diagram of a temperature sensor.
[0036] Figure 4 It is a graph of the thermal resistance characteristic.
[0037] Figure 5 This is a partial schematic diagram of the LoRa module.
[0038] Figure 6 This is a partial schematic diagram of a 4G module.
[0039] Figure 7 This is a partial schematic diagram of the charging management circuit in the power supply module. Detailed Implementation
[0040] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.
[0041] refer to Figure 1 As shown, this utility model discloses a low-power, high-precision wireless transmission temperature transmitter, comprising:
[0042] Multiple temperature sensors are installed at different depths inside the pipeline in the oilfield to be tested.
[0043] The ADC module connects to multiple temperature sensors via a multi-channel analog switch chip to acquire electrical signals from the temperature sensors and convert them into digital signals.
[0044] The MCU main control chip is connected to the multiplexer analog switch chip and the ADC module. It is used to generate binary signals and transmit them to the multiplexer analog switch chip; and to receive the digital signals output by the ADC module.
[0045] A multi-channel analog switch chip is used to turn on or off the signal path between the output of a preset temperature sensor and the input of an ADC module based on binary signals.
[0046] The wireless transmission module is connected to the MCU main control chip and the aggregation point of the oil field under test, and is used to transmit the digital signals received by the MCU main control chip to the aggregation point of the oil field under test.
[0047] The power supply module is connected to the ADC module, MUC main control chip, multi-channel selection analog switch chip, and wireless transmission module.
[0048] like Figure 2 As shown, Figure 2 This is a system architecture diagram for a temperature transmitter. In the field of oilfield monitoring, temperature transmitters are installed at different locations within the oilfield, and temperature data is transmitted to a convergence network point via wireless transmission modules. However, in actual testing, when using the wireless transmission modules to communicate with the server / gateway (convergence node), data overlap was found between the communication gaps of multiple temperature transmitter wireless modules. Figure 2In this invention, different sub-nodes represent a temperature transmitter. To address this issue, a receiving buffer is set up at the aggregation node. After receiving data, it is stored first, and then sent to the platform during idle time to avoid packet loss caused by data crossover.
[0049] In this embodiment, a button adjustment circuit is also included, which is connected to the MCU main control chip. Three external buttons are used to implement button circuit input commands, which are then transmitted to the MCU main control chip to change the parameter settings of the temperature transmitter to adapt to different requirements.
[0050] like Figure 3 As shown, Figure 3 This is a structural diagram of a temperature sensor. Figure 3 The U1 chip is the core chip. Its AVDD pin is connected to the power supply, and the C1 (100nF) capacitor is connected to ground to filter the power supply and ensure stable power supply to the chip. SDA_A and SCL_A are the serial data and serial clock pins, respectively. The VREFP and VREFN pins are used to provide the reference voltage. The circuit composed of resistors R11 (1KΩ) and R15 (1KΩ) and capacitors C4 (10nF) and C8 (10nF) conditions the reference voltage to ensure its accuracy and stability. TVS2 (SP1003-01D14K (10PPM)) is a transient voltage suppression diode. Together with resistor R13, it can protect the circuit from transient overvoltage impacts and enhance the reliability and stability of the temperature sensor circuit.
[0051] In this embodiment, the temperature sensor is specifically either a resistance temperature sensor or a semiconductor temperature sensor.
[0052] like Figure 4 As shown, Figure 4 This is a graph showing the thermal resistance characteristics.
[0053] In this embodiment, preferably, the resistance temperature detector (RTD) (such as platinum resistance thermometer, copper resistance thermometer Cu50, etc.) is a commonly used temperature sensor in industry, whose core characteristic is that the resistance changes with temperature. However, in practical applications, due to the influence of material properties, manufacturing process, environmental factors (such as self-heating effect, aging caused by long-term use), the resistance-temperature relationship of the RTD may deviate from the ideal linearity (for example, nonlinear deviation occurs in the low temperature or high temperature range), resulting in a decrease in temperature detection accuracy.
[0054] Resistance temperature detectors (RTDs) are widely used in low-temperature testing in industry. Their resistance increases proportionally with temperature, exhibiting a good linear relationship. However, in practical applications, various influencing factors can cause the linearity of RTDs to decrease. Therefore, to ensure their testing accuracy, a precise and efficient calibration algorithm has been designed.
[0055] Within the entire measurement range of the resistance temperature detector (RTD), seven calibration points are sequentially selected: T1, T2, ..., T7. These are then grouped in pairs, resulting in six groups. Based on the principle that two points determine a straight line, the first piecewise function (corresponding to the group formed by T1 and T2) is determined as F1(T) = a1T + b1. Substituting the calibration points T1 and T2 into the piecewise function, an augmented matrix can be constructed as follows:
[0056]
[0057] By using Gaussian elimination, the matrix is simplified to an echelon form, and the result is substituted back into the matrix to obtain parameters a1 and b1. Then, the first piecewise function is obtained. By analogy, all piecewise functions describing the relationship between the resistance F and temperature T of the RTD can be obtained. The electrical signal output by the RTD temperature sensor is corrected by the piecewise functions.
[0058] In this embodiment, the ADC module uses a 24-bit sampling chip. The high-precision sampling chip has high resolution characteristics, which can realize accurate digital conversion of the weak electrical signal output by the temperature sensor, significantly improving the accuracy and sensitivity of temperature measurement. It can detect more subtle temperature changes and meet the high-precision requirements of oilfield temperature monitoring.
[0059] like Figure 5 The above, Figure 5 This is a partial schematic diagram of the Lora module. Pins 1 and 26 of the Lora module are both connected to GND to provide a ground reference potential for the module, ensuring circuit stability. V_LORA (pin 25) is the power input pin, providing power for normal operation. The AUX pin (pin 24) indicates the module's operating status. RX (pin 23) and TX (pin 22) are the receive and transmit pins, respectively, used for serial data communication with the MCU main control chip to transmit and receive digital signals. M1 (pin 21) and M0 (pin 20) are mode configuration pins; different level combinations can set the Lora module's operating mode, such as sleep mode, wake-up mode, and data transmission mode. Through the coordinated operation of these pins, the Lora module can accurately transmit the digital signals received by the MCU main control chip to the gateway of the oil field under test.
[0060] In this embodiment, specifically, when the wireless transmission module is a LoRa module, the digital signal received by the MCU main control chip is transmitted to the gateway of the oilfield to be tested. The LoRa module is suitable for communication within the oilfield area, can achieve long-distance transmission with low power consumption, and can effectively transmit the digital signal received by the MCU main control chip to the oilfield gateway, meeting the data aggregation and relay transmission needs of multiple temperature measurement nodes in the oilfield. Moreover, the network is flexible and easy to deploy in the complex terrain environment of the oilfield, reducing the communication construction cost.
[0061] like Figure 6 The above, Figure 6 This is a partial schematic of the 4G module. The power input pins of the 4G module are connected to capacitors C13 (10pF), C14 (33pF), C15 (0.1μF), and C16 (10μF). These capacitors form a filter circuit to filter out high-frequency noise in the power supply, ensuring a stable power supply to the module. The USB_N and USB_P pins form a USB differential signal pair, used for USB data communication between the module and external devices. The SIM_DATA, SIM_RST2, and SIM_CLK3 pins are responsible for data transmission, reset, and clock signals for the SIM card, respectively. These are key interfaces for communication between the 4G module and the SIM card, ensuring the module can interact with data via the mobile network. The NET_STATUS pin outputs the network connection status signal. The U1_TXD and U1_RXD pins form a serial communication interface for asynchronous serial data transmission between the 4G module and the MCU main control chip, enabling command sending and data receiving.
[0062] When the wireless transmission module is a 4G module, it transmits the digital signals received by the MCU main control chip to the server in the oilfield under test. The 4G module can also utilize public communication networks to directly transmit digital signals to the server, overcoming the limitations of oilfield locations and facilitating remote real-time monitoring. This allows managers to obtain temperature data promptly from anywhere, enabling efficient and convenient remote management and decision-making. The combination of these two modules provides a diverse and reliable wireless communication solution for oilfield temperature monitoring.
[0063] The device's LoRa and 4G module wireless transmission capabilities allow it to adapt to various environments and provide real-time monitoring. This enables the device to operate stably for extended periods and transmit data.
[0064] In this embodiment, preferably, the power supply module includes:
[0065] The solar panel's output is connected to the lithium battery via a charging management circuit.
[0066] The lithium battery is connected to the ADC module, MUC main control chip, multi-channel selection analog switch chip, and wireless transmission module through a voltage regulator chip.
[0067] like Figure 7 As shown, Figure 7 This is a partial schematic diagram of the charging management circuit in the power supply module. Figure 7As can be seen, the positive terminal (+) of the lithium battery is connected to the positive output port (Bat+) of the charging management circuit, and the negative terminal is connected to the negative output port (Bat-) of the charging management circuit. A negative temperature coefficient thermistor (NTC) is connected in series on the negative terminal line to monitor the battery temperature. The lithium battery is connected to a chip, whose pins 4 and 8, and pins 6 and 7 are connected to green and red LEDs respectively, which may be used to indicate the working status of the power supply module. The red LED indicates that it is charging, and the green LED indicates that it is charging. Pin 5 is connected to a 10μF capacitor and a resistor R1, which serves as a filter. Pin 2 is connected to a resistor R2 and RPROG, which may be used for current setting. In addition, the circuit consisting of a 1Ω resistor and a 10μF capacitor, as well as a 1KΩ resistor, serve as filters and voltage dividers to ensure stable circuit operation.
[0068] This utility model's power supply module employs a combination of solar panels and lithium batteries. The solar panels convert solar energy into electrical energy, which is then stored in the lithium batteries, enabling the utilization of renewable energy and reducing reliance on traditional power sources. This is particularly suitable for outdoor areas like oil fields where wiring is difficult, reducing power supply costs and construction complexity. The lithium batteries, powered by a voltage regulator chip, supply stable voltage to various modules such as the temperature sensor and ADC module, ensuring stable operation of each module and improving the overall reliability of the temperature transmitter. Furthermore, this power supply method offers strong autonomy, maintaining power for extended periods under sufficient sunlight, meeting the continuous power needs of oil field temperature monitoring.
[0069] In this embodiment, preferably, the power supply module further includes: a heat insulation layer, which wraps around the outer surface of the lithium battery casing to form a vacuum heat insulation cavity.
[0070] In this embodiment, the insulation layer is specifically any one of polyurethane foam, extruded polystyrene, and ceramic fiber.
[0071] The insulation layer has excellent thermal insulation performance, which can effectively block the impact of low temperature on lithium batteries in the low-temperature environment of oil fields, slow down the rate of battery temperature drop, avoid problems such as reduced lithium battery performance and increased power loss due to low temperature, ensure stable charging and discharging of lithium batteries under low temperature conditions, and thus ensure that the power supply module continuously and reliably supplies power to all components of the temperature transmitter, improve the working stability and reliability of the entire temperature transmitter in harsh low-temperature environments, and effectively mitigate the impact of outdoor nighttime temperature drop on batteries.
[0072] In this embodiment, preferably, the temperature transmitter further includes:
[0073] The switch control circuit is connected to the MCU main control chip and is used to receive the power-off signal of the MCU main control chip; it is connected to the multiplexer analog switch chip, ADC module, wireless transmission module and power supply module. When the switch control circuit is turned on, the power supply provides power to the multiplexer analog switch chip, ADC module and wireless transmission module.
[0074] The switch control circuit includes:
[0075] The transistor's base is connected to the GPIO pin of the MCU main control chip, and its emitter is grounded;
[0076] The source of a MOSFET is connected to the power supply output terminal, the drain is connected to the power input terminal of a multi-channel analog switch chip, ADC module, or wireless transmission module, and the gate is connected to the collector of a transistor.
[0077] When the system is idle or in a low-power demand state, the MCU main control chip can send a power-off signal to the switch control circuit. The transistor and MOSFET work together to cut off the power supply to the multi-channel selection analog switch chip, ADC module, and wireless transmission module, putting them into sleep mode. This significantly reduces the overall system power consumption and extends the lithium battery power supply time, meeting the stringent low-power requirements of oilfield monitoring. In terms of circuit protection, this circuit prevents modules from being continuously powered on unnecessarily, reducing the risk of electrical faults caused by prolonged power supply and improving the stability and lifespan of each module and the entire temperature transmitter. Furthermore, by precisely controlling the power supply to each module, potential power interference between different modules can be effectively avoided, ensuring stable and reliable operation of each module and improving the accuracy and stability of temperature transmitter data acquisition and transmission.
[0078] In this embodiment, the multi-channel selection analog switch chip is any one of the following: SGM4782, CD4051, and 74HC4051.
[0079] The multi-channel analog switch chip has each input terminal connected to the output terminal of a temperature sensor, and its output terminal connected to the ADC detection pin of the ADC module. Its enable terminal is grounded, and its address terminal receives the binary signal output by the MCU main control chip, thereby realizing precise control of the signal path between the preset temperature sensor and the ADC module.
[0080] Taking a common 8-channel multiplexed analog switch chip (such as CD4051) as an example, its three address terminals (A, B, C) can be combined to form eight different binary codes (000-111), corresponding to eight different input terminals (IN0-IN7). When the MCU main control chip sends a binary signal (such as 010) to the address terminal, the chip's internal decoding circuit will parse the signal and activate the corresponding channel control circuit, making the corresponding input terminal (such as IN2) and output terminal in a conducting state. At this time, the output signal of the temperature sensor can be transmitted to the detection pin of the ADC module through the chip; while the unselected input terminal remains in a closed state, and its signal cannot be transmitted to the ADC module. In this way, the multiplexed analog switch chip can, according to the MCU's control signal, sequentially input the output signals of different temperature sensors into the ADC module for sampling, realizing the cyclic detection of multiple temperature points.
[0081] In this embodiment, preferably, the MCU main control chip further includes:
[0082] A comparator is used to compare the received digital signal with a preset threshold value.
[0083] After receiving the digital signal converted by the ADC module, the MCU main control chip immediately inputs it to the internal comparator. The comparator compares the signal with a preset threshold in real time. When the received digital signal is greater than the preset threshold, the comparator outputs a high level, and the MCU main control chip controls the external buzzer to sound, the LED to light up, or sends an alarm message to the server / gateway through the wireless transmission module.
[0084] In this embodiment, when the comparator detects that the digital signal converted by the ADC module exceeds a preset threshold, it reports the latest collected data to the server / gateway three times according to the acquisition interval. If the three temperature data are not reported to the server / gateway, the server / gateway will set an alarm, and the temperature measurement node needs to be manually checked.
[0085] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.
Claims
1. A low-power, high-precision wireless temperature transmitter, characterized in that, include: Multiple temperature sensors are installed at different depths inside the pipeline in the oilfield to be tested. The ADC module connects to multiple temperature sensors via a multi-channel analog switch chip to acquire electrical signals from the temperature sensors and convert them into digital signals. The MCU main control chip is connected to the multiplexer analog switch chip and the ADC module. It is used to generate binary signals and transmit them to the multiplexer analog switch chip; and to receive the digital signals output by the ADC module. A multi-channel analog switch chip is used to turn on or off the signal path between the output of a preset temperature sensor and the input of an ADC module based on binary signals. The wireless transmission module is connected to the MCU main control chip and the aggregation point of the oil field under test, and is used to transmit the digital signals received by the MCU main control chip to the aggregation point of the oil field under test. The power supply module is connected to the ADC module, MUC main control chip, multi-channel selection analog switch chip, and wireless transmission module.
2. The low-power, high-precision wireless transmission temperature transmitter according to claim 1, characterized in that, The power supply module includes: The solar panel's output is connected to the lithium battery via a charging management circuit. The lithium battery is connected to the ADC module, MUC main control chip, multi-channel selection analog switch chip, and wireless transmission module through a voltage regulator chip.
3. A low-power, high-precision wireless transmission temperature transmitter according to claim 2, characterized in that, The power supply module also includes an insulation layer, which is wrapped around the outer surface of the lithium battery casing.
4. A low-power, high-precision wireless transmission temperature transmitter according to claim 3, characterized in that, The insulation layer can be any one of polyurethane foam, extruded polystyrene, or ceramic fiber.
5. A low-power, high-precision wireless transmission temperature transmitter according to claim 1, characterized in that, Also includes: The switch control circuit is connected to the MCU main control chip and is used to receive the power-off signal from the MCU main control chip. It is connected to a multi-channel selection analog switch chip, an ADC module, a wireless transmission module, and a power supply module. When the switch control circuit is turned on, the power supply provides power to the multi-channel selection analog switch chip, the ADC module, and the wireless transmission module. The switch control circuit includes: The transistor's base is connected to the GPIO pin of the MCU main control chip, and its emitter is grounded; The source of a MOSFET is connected to the power supply output terminal, the drain is connected to the power input terminal of a multi-channel analog switch chip, ADC module, or wireless transmission module, and the gate is connected to the collector of a transistor.
6. A low-power, high-precision wireless transmission temperature transmitter according to claim 1, characterized in that, The ADC module uses a 24-bit sampling chip.
7. A low-power, high-precision wireless transmission temperature transmitter according to claim 1, characterized in that, When the wireless transmission module is a LoRa module, it transmits the digital signal received by the MCU main control chip to the gateway of the oil field under test. When the wireless transmission module is a 4G module, it transmits the digital signals received by the MCU main control chip to the server of the oil field under test.
8. A low-power, high-precision wireless transmission temperature transmitter according to claim 1, characterized in that, The MCU main control chip also includes: A comparator is used to compare the received digital signal with a preset threshold value.
9. A low-power, high-precision wireless transmission temperature transmitter according to claim 1, characterized in that, The multi-channel selection analog switch chip can be any one of the following: SGM4782, CD4051, or 74HC4051.
10. A low-power, high-precision wireless transmission temperature transmitter according to claim 1, characterized in that, The temperature sensor can be either a resistance temperature sensor or a semiconductor temperature sensor.