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DTMF-remote – Activate relays with your smartphone
Posted by admin on October 13th, 2009
Emilio Ficara writes:
I have a smartphone and I can run a web server on it, but I want to put the smartphone on a rover and drive the motors to run it into my house. So I developed this small circuit, based on ATtiny2313 microcontroller, that activates relays under smartphone control using simply DTMF (dialtone) sounds emitted by the speaker.
I have on my site the whole documentation about the project: the schematic diagrams of the circuit, based on ATtiny2313 microcontroller, the firmware to burn in the micro, two CAB autoinstalling file to run test application on a smartphone and the full project source for one of them, written with FBA, a free environment for developing smartphone or pockectPC applications; thanks to the source files, a user can easily modify the test program for his needs. The circuit has a microphone, a small analog circuitry to amplify the sound and decode the DTMF tones, a microcontroller that puts on serial port ASCII characters corresponding to the decoded DTMF tones, and three relays, indipently controlled with specific dialtones. The test application on smartphone has controls to individually turn ON or OFF the relays and a small sequencer, user modifiable, to control the relays automatically at programmed time.
DTMF-remote – Activate relays with your smartphone - [Link]
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