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question about a 4*4 matrix keypad

 
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Experientia_docet



Joined: 15 Jul 2009
Posts: 13
Posted: 16 July 2009, 3:24 AM    Post subject: question about a 4*4 matrix keypad Reply with quote
Instead of using 8 pins to connect the keypad, what is the cheapest module to use to connect a keypad to the microcontroller. What do you call it so I sound like i know what im talking about when i walk into the shop ? Twisted Evil
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dkinzer
Site Admin


Joined: 03 Sep 2005
Posts: 2499
Location: Portland, OR
Posted: 16 July 2009, 4:05 AM    Post subject: Re: question about a 4*4 matrix keypad Reply with quote
Experientia_docet wrote:
what is the cheapest module to use to connect a keypad to the microcontroller.
Perhaps a PCF8574. There is sample code and a circuit diagram for using one to interface a matrix keypad in AN205.
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Experientia_docet



Joined: 15 Jul 2009
Posts: 13
Posted: 16 July 2009, 6:27 AM    Post subject: But the diagram shows two 'modules' Reply with quote
Thankyou dk for the direct link. Mike. Rolling Eyes
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