A weblog focused on interesting circuits, ideas, schematics and other information about microelectronics and microcontrollers.
Decoding DTMF (Dual Tone Multi frequency) with MT8870 chip and AVR x2313 microcontroller.
The DTMF decoder 2 is a useful tool used for decoding DTMF (Dual Tone Multi frequency) generated by telephones. The decoded digits are viewed on a 16x2 LCD screen. The DTMF decoder can be directly connected to a Serial port to view the digits in HyperTerminal on a computer. The decoder stores the last 234 received digits in EEPROM. The contents of EEPROM can be viewed on the LCD screen via two scroll buttons.