Based on the design of the TC35 GSM module CO gas monitor, its main feature is the ability to apply SMS for data transmission. The wireless communication module TC35 is introduced in detail, and the application of the TCC35 short message transceiver module in the CO gas monitor is given. The CO gas concentration monitor is a portable intelligent instrument used to measure the CO content in the relevant ambient air. At present, the most common data communication between the domestic CO gas monitor and the control center is completed by CAN bus, RS485 bus or RS232 bus. The communication distance of RS232 bus is 12 m, the maximum is 15.4 m; the communication distance of RS485 bus is 1200 m. The direct communication distance of the CAN bus is up to 10 km. But either way has a limit on distance. And ultimately decided the fixedness of the control center. With the rapid spread of GSM mobile communication networks and increasingly fierce competition. The GSM module acts as a primary GSM network access device. Applications are becoming more widespread and have developed a variety of promising applications.
The TC35 module is the main functional component of the terminal. It consists of GSM baseband processor, power supply ASIC, RF circuit and flash memory. It is responsible for processing audio, data and signals in GSM cellular devices. The embedded software is partially executed. Application interface and the functionality of all GSM protocol stations. The baseband processor includes all the analog and digital conversion functions of the cellular radio part to meet the growing requirements of the GSM and PCS cellular subscriber market. FR, HR, and EFR voice and channel coding can be supported without an external circuit. The RF section is based on the SMARTI type circuit. The antenna cable inside the module is connected to a 50Ω connector of the GSC type. The TC35 module is suitable for GSM cellular devices with minimum power. The application part of such a cellular device constitutes a human machine interface (MMI). The TC35 can be connected via the serial port (RS232). The TC35 connects to the cellular application via a 40-pin ZIF connector, which provides an application interface for control data, audio signals and power lines. The operating voltage of the terminal system is 5 VDC. Due to the sudden current consumption current of TC35, the peak value can reach 3 A. Therefore, the applied voltage regulator must meet the conditions sufficient to provide the rated current. In the terminal. The LM2596 switching power supply is used to complete the conversion from 12V to 5V. As the power supply for the TC35 terminal. It must be noted that. The conversion of the switching power supply by the LM2596 requires high-power inductors and capacitors. To improve energy storage capacity. Meet the power requirements of the TC35.
Structure of CO gas monitor system
The structure of a portable CO gas concentration monitor with GSM short message transmission and reception function is shown in the figure. The monitor developed by the author is mainly used for monitoring the CO concentration in the air in public places and some production workshops. Use the battery as the power supply. The CO sensor N1 is an NAP-505 electrochemical sensor manufactured by Japan Basic Chemical Co., Ltd. The sensor output current is linear with the CO gas concentration. A1 (OP90) can ensure the potential of the working electrode and the reference electrode. The sensor output OμA ~ 70μA current is converted to 0 V ~ O by Aa (OP90). The voltage of 7 V is to ensure that the output of A3 is 0 V to 2.5 V when the CO concentration is 0 “10-3†to meet the input requirements of the MD converter U.I (ADS7822). The OP90 has an internal zeroing circuit. Allows the instrumentation amplifier to provide true zero-input and zero-output operation. The temperature characteristics of the NAP-505 are compensated with an NTC thermistor with a constant B of 3 435 K. After the temperature is compensated, the output is within a range of 10 °C "50 °C". Can meet the accuracy requirements.
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