I connected the TM12864L-1 board as you suggested but still no go. I could see the backlight and contrast when I did the test last week but now only the backlight lighted up. I just connected the backlight pins 18, 19, 20 and contrast pins 1, 2, 3 to do the test.
- Connect pin 17 (RESET) to the +5V solved the COM error ( this prevents the upload of sketch).
- Another question about potentiometer, how do you wire it ? I connected pin 3 of the tm12864 to the middle pin of the pot, pin 18 to 1 leg of the pot and the other leg connected to Ground as the below diagram. potentiometer ---------------------------- : : : : : : Ground pin 3 pin 18I wonder if the contrast light is damged !Tony
Attached is the datasheet of the TM12864L-1 board.
I wired the board by following the guide of the table on the ks0180 playground. I used the Pinout B of the table which appears to match with the datasheet.
This is what I did to test the board: ( by followed the suggestion of Ugwick ).- Connect pin 19 (+5V) , 20 (Gnd) to the power supply . The backlight lighted up when I connected it.- Connect pin 2 to 5V pin of the Arduino , connect pin 1 to Gnd on Arduino.- pin 3, 8 and Gnd connect to the Pot ( as on the diagram I draw earlier). Also I tried to replace the Gnd cable with the +5V ( ie, 3, 8, 5V on the pot).