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Anyone know of a cheap source for 3 or 4 key membrane keypads ? It is easy enough to find expensive ones from parts suppliers but I can't find anything on eBay. Or to look it it another way, if you had a project that only needed 4 keys for data entry, is there a more elegant way than 4 push button momentary switches drilled through the front panel ? The most elegant is undoubtedly a touch screen GDU but I'm not going that way - yet !
Andrew
Andrew, you can disassemble a piezo buzzer and use the internal as a pushbutton. Just connect the two wires one to ground and one to the input (better if you protect the input with a zener) use the DT interrupt routine and you will see the piezo element switching your interrupt all the time you press it.
Mind the polarity.
Al.
Tact switches mounted on a pcb, some hole on the front plate, and a home made (or any other much fancy place) membrane to stick over the whole thing (front-plate). Neat enough, cheap enough, easy to repair/modify too.
Now that sounds interesting.Quote:
Originally Posted by aratti
Scary parallel processing - I've got a piece of scrap PCB at home with a tact switch covered with some clear silicone which is drying. I'm hoping the silicone will have not penetrated the switch but will provide a flexible enough seal over it.Quote:
Originally Posted by mister_e
Andrew
Check out this keypad at Sparkfun. It is a silicon 2x2 with LED backlight. Kinda neat and you can build up other key matrixes using the parts. They also have 4x4, a 3 button gamepad like, and a 12 key membrane. The 4x4 can be cut in half to make 2 2x4 pads.
they've got some nice keypads there - thanks :)Quote:
Originally Posted by falingtrea