- No pixels visible on the display
- Check +5v and Gnd connections between Arduino and GLCD panel
- Check all data and command pins are wired according to the datasheet and matching the configuration settings – this is the most common cure to this problem.
- Check the datasheet for your panel to verify appropriate timing values are set in the configuration file.
- Check contrast voltage (typically between -3 and -4 volts) on contrast-in pin of LCD panel. While the sketch is operating, try gradually adjusting the pot through its range. Some displays are very sensitive to this setting.
- Check sketch has compiled ok and downloaded to Arduino.
- Run GLCDDiags test sketch.
- All pixels are dark
- Check contrast voltage (typically between -3 and -4 volts) on contrast-in pin of LCD panel. While the sketch is operating, try gradually adjusting the pot through its range. Some displays are very sensitive to this setting.
- Left and right side of image reversed
- Swap CSEL1 and CSEL2 wires (or swap pin assignments in header file)
- No Serial port diagnostic information
- Verify the code is compiling and properly uploading
- Disonnect glcd wires to ensure that no pins are in conflict with the serial port pins
Diagnostic Sketch
Generated on Tue Jun 22 17:50:27 2010 for Arduino GLCD Library by
1.6.3