Humidity and Temperature Wireless Measurement System Based on NRF905 and SHT11 in Coal Mine

In order to measure the humidity and temperature of coal mine accurately, design uses low power microprocessor MSP430F2274 as control chip in this system, data acquisition by digital temperature and humidity sensor SHT11, taking nRF905 as the core of the RF module for wireless transmission, measurement results by LCD display and transfer to PC through CAN bus at the same time. To solve the traditional way of measuring precision is low, cable transmission system needs to be at the measurement site layout of the large number of wires and cables, and the circuit for transmitting signals can be affected by electromagnetic interference problems, ensure the reliability of the measurement results. The design has given the hardware circuit diagram and data flow chart.