You need a cellular or wired telephone that can automatically answer a call, and hang up once the originator has ended the call. however a lot of keypads don't have ABCD). Onboard LEDs also relay the output status for easy testing and debugging.Ĭlick here for a module that has decimal outputs (i.e. The outputs are BCD (Binary Coded Decimal) so only four pins are required for 16 outputs. Inline header pins are soldered with which you can connect power and access the digital outputs. The board is fully assembled, and has a 3.5mm stereo jack socket for audio input. with each tone controlling a digital output on the board. The MT8870 IC can decode the DTMF tones generated by a telephone keypad. Now available from PMD Way is this useful MT8870 DTMF Decoder Module.
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March 2023
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