Keypad in a circuit?
As a hobby, I enjoy making basic electronic circuits. I don’t know much about electronics, and I was wondering if someone that was knowledge in this area would be kind enough to point me in the right direction!
My objective is to connect a keypad (like a phone’s keypad,0-9, #, *) to an LED or LCD 7 segment display and have the display read the corresponding character(will figure out # and * later). Does anyone know how i would go about doing this?
This is the keypad: http://www.sciplus.com/singleItem.cfm/terms/14489
Thanks to ANY help available!
Tagged with: Electronic Circuits • lcd 7 • objective • right direction • segment display
Filed under: Hobby Electronic Circuits
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You’re going to need a bit more than just simple logic circuits. Most keypads are ’scanned’ by sequentially pulling the ‘row’ lines low and looking at the ‘column’ lines to see which one is low(sometimes it’s the column lines that are scanned and the row lines read). For this you need quite a bit of circuitry.
Or you could just use a simple, cheap microprocessor. Go look around at http://www.microchip.com They have a ton of stuff for the hobbyist/experimenter/tinkerer. And they also have things which I’ve used for some fairly serious commercial projects as well.
Doug