I have watched your Arduino DTMF tutorial several times. And I am trying once and again. Everything is going on fine. But at last when I called the module > module receive my call after two ring > and I press 1 and 0 several times but no response.
My working list is given bellow:
Connections of (SIM800L, ARDUINO UNO and 3.7V Battery)
SIM800L VCC -> 3.7V Battery (+)
SIM800L GND -> GND with 3.7V Battery (-) and Arduino UNO GND
SIM800L TX -> UNO D7
SIM800L RX -> UNO D8
After that I have uploaded Serial Communication Code to UNO and give some AT Commands which is just given bellow:
After that I have uploaded your code from here: http://www.raviyp.com/embedded/232-arduino-dtmf-tutorial-using-sim900-sim800-modules-live-demo
then Serial Monitor show:
GSM DTMF Tutorial, Valetron Systems @www.raviyp.com
Any tech queries to be posted to www.embeddedadvice.com
After that I called the module and the module receive my call after two ring. Then I pressed 1 and 0 many many times but no response.
Will you please help me about it??