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One 555 and 2 wires for 12 keypad interface is cool
posted February 21 2011 20:37.07 by Giorgos Lazaridis

Raj from embedded-lab just informed us for his latest project. This time, he made a cool 2-wire keypad interface for microcontrollers, using a 555 timer. The theory of operation is...

[Link: embedded-lab]
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Tags: electronic project   diy   microcontroller   pic   555   

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