This ended up coming via slow boat from Thailand. To do that, I must be able to detect and decode the DTMF tones generated when pressing a key on the telephone handset.Īs I started researching decoding DTMF, I found this little board does just that which I could connect to an Microcontroller Unit (MCU) quite easily.
I am working on a project where I want to press keys on my telephone and send commands via WIFI to a computer. Note2: If you make a circuit such as this to connect to a POTS line, make sure you install the 2 specified fuses to protect the device from voltage spikes / lightning strikes. When I’m done it will be connected to a VoIP ATA, not a copper phone line. In my testing, this device is connected to a small PBX. Note1: The FCC frowns upon you connecting devices to the telephone system (the old copper line network a.k.a.
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