Automation Using GSM
In Earlier post (Notice Board Display using GSM) I covered how to configure GSM module using AT commands similarly for Automation using GSM also similar operation is required.
use USB to TTL converter to create virtual com on your PC then connect your GSM module to USB to TTL converter and communicate with it using coolterm.
USB-TTL converter
USB-TTL -GSM interface
1.Tx of USB-TTL to Rx of GSM
2. Rx of USB-TTL to Tx of GSM
3 Gnd to Gnd
1) Type AT it should respond with OK
2) Send AT+CMGL="REC UNREAD"
it should respond with ok
send AT +CMGF=1 //text format
again it responds with ok
send AT+CMGD=1 //delete message from location 1
again it responds with ok
4) wait until it responds with call ready
5) when new message is received it responds with +CMGI: "SM", 1
//location 1 on SIM
then send AT+CMGR=1
//to read message
6) Based on character received you can perform switching action
Here in this example i controlled port 0_8, 0_9 pins based on char 'a' 'b' received
i) toggle LED 0_8 on char 'a'
ii) toggle LED 0_9 on char 'b'
download-code
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