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Thank You Mark!I was scratching my head as well.I have a 16x2 display on a Mega 2560 which seems to work on the same principal as your 20x4.I had to change the "lcd.begin (20,4);" to "lcd.begin (16,2);"
Autodesk has moved circuits to Tinkercad, but your pin-to-pin instructions made it so that I could make it. Thanks!
Thanks for the instructable.Autodesk Circuits has closed down and moved to tinkercad, but your pin-to-pin instructions made it easy.Thanks!Th
I also bread-boarded it out with an Arduino Uno R3. Works like a charm.I will be mounting this under my workbench as the tennis ball keeps getting in my way. Thanks a bunch. I'll post pics when I get it finished, just waiting for the Pro-Mini's to arrive in the mail.