question about a 4*4 matrix keypad

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Experientia_docet
Posts: 13
Joined: 15 July 2009, 5:32 AM

question about a 4*4 matrix keypad

Post by Experientia_docet »

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:
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dkinzer
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Joined: 03 September 2005, 13:53 PM
Location: Portland, OR

Re: question about a 4*4 matrix keypad

Post by dkinzer »

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.
- Don Kinzer
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Experientia_docet
Posts: 13
Joined: 15 July 2009, 5:32 AM

But the diagram shows two 'modules'

Post by Experientia_docet »

Thankyou dk for the direct link. Mike. :roll:
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