An intelligent air conditioning control system based on Mobile Communication networks

In this project, an air conditioning remote control system was implemented with the STC90C516RD+ micro control unit (MCU) as the control core. Through Global System for Mobile Communications (GSM), users send the control instructions to the system by short messages as the information carrier. The remote communication hardware part is mainly composed of SIM900A and subscriber identity module (SIM) card. According to the AT command set format MCU interacts with SIM900A module through RS232 serial interface. Necessary data such as the users´ identity and infrared code is stored in electrically erasable programmable read-only memory (EEPROM) device. The system can be achieved finally as below: 1) users send Short Message Service (SMS) messages in a specific format 2) MCU read and parse the message to get the command within it 3) finally execute the instructions and send a feedback message to the user. The experiments showed that the system operates correctly and stably.