Today, most telephone equipment use a DTMF receiver IC. One common DTMF receiver IC is the Motorola MT8870 that is widely used in electronic communications circuits. The MT8870 is an 18-pin IC. It is ...
[Colin] wanted a way to reliably control an Arduino via ham radio. One of the easiest methods of automated radio control makes use of Dual-Tone Multi-Frequency signalling. To those who aren’t into ...
Developing a system to interface the telephone line with a microcontroller is the main purpose of this project which will involve the of DTMF tones. The device was based on the ATmega8 microcontroller ...
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