LCD not doing anything

Question

I just bought an LCD. I connected everything as explained in this sheet.

This is the code I am using:

#define RST 3
#define CE 2
#define DC 4
#define DIN 6
#define CLK 5

void LcdWriteCmd(byte cmd) {
  digitalWrite(DC, HIGH); //DC pin is low for commands
  digitalWrite(CE, HIGH);
  shiftOut(DIN, CLK, MSBFIRST, cmd); //transmit serial data
  digitalWrite(CE, LOW);
}

void setup() {
  pinMode(RST, OUTPUT);
  pinMode(CE, OUTPUT);
  pinMode(DC, OUTPUT);
  pinMode(DIN, OUTPUT);
  pinMode(CLK, OUTPUT);
  digitalWrite(RST, LOW);
  digitalWrite(RST, HIGH); 
  LcdWriteCmd(0xAE); // LCD set display enabled
  LcdWriteCmd(0x21); // LCD set power COntrol
  LcdWriteCmd(0x14); // LCD bias mode 1:40
  LcdWriteCmd(0xA2); // LCD basic commands
  LcdWriteCmd(0xA9); // LCD all segments on
}

void loop() {
}

The commands I used are in the command table of this sheet. (page 12) It is supposed to turn all pixels on now. However nothing happens. All pixels are staying off.

Can you see a problem?

Answer 1

I am not so sure the command that you used to turn all pixels on is right. It might say it in the document but you should try to manually turn a couple of pixels on yourself. check the link bellow if you need more assistance with LCDs.

Also be sure that you connected some power and a potentiometer to the contrast pin and/or backlight of the LCD.

https://www.youtube.com/watch?v=dZZynJLmTn8