Gadget Reboot
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Description
DTMF Decoder Phone Interface
This pcb can be connected to a land line and when DTMF tone pairs are detected, they are decoded by the MT8870.
4 bit data can be decoded by Arduino or another processor to determine what phone key was pressed.
It is recommended to only connect this circuit to the phone line after a phone goes off hook, for example by switching the contacts onto the phone line with a relay. This keeps the circuit away from the high voltage AC ring signal.
Code
DTFM Decoder sketch for Arduino
https://github.com/GadgetReboot/DTMF_Decoder
Schematic and Layout
KiCad files
https://github.com/GadgetReboot/DTMF_Decoder
Aug 15,2022
1,387 views
DTMF Decoder Phone Interface
Decode DTMF tones from the phone line and provide digital outputs for Arduino etc
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Published: Aug 15,2022
Download Gerber file 9
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