Hello folks, I'm tearing my hair out trying to get my project to work. I have an Arduino Uno R3 clone (Freetronics 100% compatible) with a 20x4 I2C LCD from DX (part number GY-LCD-V1). I also have four pushbuttons connected via the analog pins (in digital mode.) Other than that I have nothing conne…

Uno R3 + 20x4 I2C LCD - screen freezes / garbage

liuzengqiang December 1, 2012, 6:34am 9

Do you have another I2C device such as a real time clock to test out the I2C bus stability?

Maybe it's time to switch to my TTL serial lcd backpack

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