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Need small alphanumeric keypad for data entry

If this is a one-off, buy a cheap remote control or calculator with a keyboard grid that looks OK and rip it out. You'll have to adapt to the scan pattern laid out on the pad already (although you could go in and cut it up if you really wanted to.)

If this is going to be fabricated in even small quantities, buy 36 tact switches and lay them out on a PC board according to how you want to scan them. 6x3.5mm and 6x6mm and 12x12mm are common form factors. With all but the 12x12mm, you'll have room to spare to put 36 in your space. And you get to put them in whatever scan order you want.

Tim.

Reply to
Tim Shoppa
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I'm working on an embedded project and need a "keyboard" for data entry. ABOUT 2" x 2.5" that will allow input of 26 letters and digits at least. It could be operated by a stylus.

Does anyone know where I can find such a thing?

Jim

Reply to
James Johnson

In the last issue (one of the last ones, anyways)of Nuts & Volts there was an article about hacking a kid version of a PDA ($10 price range) that had full keyboard, graphic screen and a serial interface. The hack was to make it a serial terminal. See if it works for you: it may be easier to receive data via serial port rather than dealing with a key decoding, debouncers etc. of a real keyboard.

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Dmitri Abaimov, RCDD
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Reply to
Dmitri(Cabling-Design.com

Beter yet would be to use one of the cheap organizers like the ones made by royal, because they have an alphanumeric keypad.

I've done this before!

Rocky

Reply to
Rolavine

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