To counter to some problems in coal mine safety monitoring,an early-warning system for real-time coal mine safety monitoring based on the wireless sensor networks was designed,and the overall structure of the system was given.This system took MC13213 as the center unit of the wireless sensor network and can carry out the real-time collection and monitoring of the concentrations of CO,O2 and CH4 as well as the air temperature and humidity in the mine.The system also took ARM microprocessor S3C44B0X as the ce...