Arduino Uno 1.6.7
testing with both an LCD 20x4 and 16x2
for a while I was happily learning about I2C and LCD display.
I installed the library - LiquidCrystal_I2C
removed the LCD library from Arduino standard library
soldiered the I2C to the 16x2 display.
everything was working well and I was able to see text in the display.
something happened, I am not sure what, that caused the LCD to no longer display.
I’m not sure where to look further for the problem.
here is what I know so far:
connected GND, VCC, SDA, SCL, from the I2C board to the arduino - GND, 5v, digital 4, digital 5
red Power LED lights up on the I2C
the backlight still lights up.
I am able to run other sketches which involve a potentiometer and led lights.
I ran the I2C scanner Written by Nick Gammon. It returns: 0 devices found.
I tried attaching a different LCD - 20x4. and adjusted the sketch, buts still no device found. and no text displayed.
i used the only diagnostic tool I could find to see if there might be an issue with it.
// Arduino ShowInfo
it again did not find an I2C, but the other tools reported back data. (it appears to be ok)
I’m wondering if wires accidentally touched the underside of either board to cause a short?
maybe miswired GND and 5v by accident?
like i said they were working for a short time when I had just started to use the 16x2 LCD and I2C board. any suggestions or help is greatly appreciated. see pictures attached.