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Old 04-12-2018, 07:33 PM   #171
Join Date: Sep 2013
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I too had difficulty getting my keypad to work. I finally wrote a sketch to test the keypad. I posted it in message #128. It echos the key presses to the serial monitor so you can see what is happening. You adjust the row and column pin assignments until it works and then copy those over to the indexer sketch.

I didn't use a schematic when I put my controller together. However, looking at the pictures and my code I came up with the attached. It is for the pro-micro that I used. It allows me to plug the keypad in without using jumpers. I think a nano would be better choice than the pro-micro just because of the idiosyncrasies of uploading to a pro-micro. I believe the nano pinout also allows for 8 consecutive pins to be used for the keypad.



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Old 04-13-2018, 10:31 PM   #172
Join Date: Nov 2009
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Thanks, John! I do have a Pro Mini but was trying to use a nano. It does support 8 consecutive pins for analog support. I'm using the same driver as bmac used, mainly because I've bought one or two whenever I found them on sale. I do have a Pololu driver in stock but I like the higher amperage.

Agin thanks! George

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