This design combines the advantages of solar energy independence and national grid energy saving with the advantages of sensitive and low energy consumption of human infrared sensors and smoke sensors, and adopts a new generation of super anti-interference, anti-static and ultra-low power consumption microprocessor MSP430 as the core controller. The system mainly includes MSP430 system module, human body infrared sensor module, smoke sensor module, power supply module, photosensitive circuit module, alarm module, LED circuit module and so on. Realize the functions of using solar energy to charge the battery during the day, 24-hour fire alarm and lighting at night. By collecting and processing the information of each sensor, the system module realizes the intelligent control of the fire alarm system, and achieves the functions of efficient utilization of solar energy, energy saving, environmental protection and safety.

Key words: MSP430 solar energy; Fire alarm; Alarm system