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Automating a phone keypad, use relays? — Parallax Forums

Automating a phone keypad, use relays?

malfunctioningradiorockmalfunctioningradiorock Posts: 2
edited 2009-03-29 01:43 in General Discussion
Hello All,

I'm very new to this and have a very basic question:

Let's say I take apart a phone and remove the keypad.· I'm left with 13·pins that are connected to something like 20 buttons.· When the button on the keypad is pushed it connects 2 of the 13 pins.· Ex.· Pins 7 and 8 generate the dtmf signal for the button 1, pins 7 and 5 = button 2 etc.

My question is, is there anyway to use the sx chip to connect the various pins that were originally intended to be connected by physically pushing a button?· Hopefully there is a way that does not involve using many relays.

Maybe it would be easier to just get a dtmf chip, but I am curious how the senario above would accomplished.

Thanks for reading.

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