It is quite similar to a | Microcontroller › AVR › Are Frequencies Produced › It is quite similar to a April 11, 2013 at 10:08 am #9458 Jason JordonParticipant It is quite similar to a conventional telephone. Yes, a 4*4 keypad can produce upto 16 different frequencies. You need to program the microcontroller for that purposes. Does this ease your problem?
