Fast Check - Send SMS
1 ) Here is the product link Sim900 GSM Module
2 ) Here is the connection of Sim900 GSM Module . Take more attention on Transmit TX and receive RX pin .
3 ) Here is the connection between arduino and Sim900 gsm module .
Arduino RX --> Sim900 TX
Arduino TX --> Sim900 RX
Status LED ( fast blink ) --> SIM Card is not connected to network
Status LED ( heart beat blink ) --> SIM Card is connected to network
4 ) After done the wiring and insert sim card , download this code . In the code , change the phone number where the sms should be sent to .
5 ) Open the serial monitor and upload the code .
6 ) Make sure the baud rate is set to 9600 . If there is no problem , sms should be sent to your number set in the code .
7 ) SMS successfully sent .