I bought a couple of these because they were cheap, but I don't have any idea what the pinouts are. Does anyone have any idea?
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=130395110380#ht_3909wt_905
Even better, if anyone has a sample project using one of these....
I have very similar keypads at home. 4 pins are connected to the rows and other 4 pins are connected to columns, when you press the button the column and row pins corresponding to button get shorted.
If you have multimeter use continuity function to find out - press one button and see which pins are shorted. After a few buttons you'll work out which pins correspond to columns/rows.
You can see keyboard diagram at 2x16 LCD and 4x4 keypad example
Had a good look at the Ebay link you provided and this is different keypad to what I have... Ignore my previous post.
The meter told me what I needed to know. Pins 2-5 are the columns and pins 6-9 are the rows. I am going to try the keypad library out now.
The meter told me what I needed to know.
Cool, you got a talking meter, mine I have to read. 