Repost...not sure why the first one posted before I was done. I have been ripping my hair out for three days trying to get the Hacktronics 20x4 LCD to work in 4 bit mode. Here is the pin config that they recommend 1 (VSS) to GND Arduino pin* 2 (VDD) to + 5v Arduino pin 3 (contrast) to potentiome…

Hacktronics 20x4 LCD Ripping my hair out ;repost with complete information.

liuzengqiang November 28, 2012, 4:35am 15

Did you install a blue tooth dongle recently by any chance?

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