Arduino and sim-900 based diy mobile phone with DTMF detection

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1

It’s been a while that I wanted to build a basic mobile device/phone with Arduino and sim900.
I finally got the time to play with it, and after few sleepless nights I came up with this great setup and code.
In the setup: arduino uno, sim-900 shield, I2c lcd, keypad, microphone, buzzer (with volume control) for the ring tone and a speaker for the audio
I can make and receive calls, and the most call feature is controlling 4 LED with DTMF detection – which is what is used in call center when you are asked “dial 1 for English ….”

Hope you like it, I got some bigger plans for it – so follow the channel

2

Finally got to make the 2nd part video.
I wanted to take advantage of the cool DTMF feature and make something interesting.

So I took an old sketch that uses the TV-Out library to allow you to play Tic-Tac-Toe on a screen using composite video input on the TV.
I then redirected any KEY strokes that came via the DTMF (via at command reply) to the serial of the arduino that had the game on it, and made the dialing phone key pad to the game controller.

Watch the video Call to play Tic-Tac-Toe on the T.V. set - exploring sim900 DTMF take II - YouTube