Smart Home Smoke Detection and Relay Contract based on STM32

Abstract

This paper discuss the smoke sensor and the relay control in the smart home.STM32 is used as the central part of the whole system and LwIP protocol is also applied to transfer data. The system uses the MQ-2 smoke sensor detect the concentration of combustible gases in air, and uses the SRD-05VDC-SL-C to close and cut off the circuit. The paper also discuss the sensitivity characteristics and the temperature and humidity effect of the smoke sensor. At the end of the paper, it is given the C code in the KEIL MDK environment.