Electronic – Arduino TC1602 no display but backlight

arduinolcd

I am using an Arduino Uno and TC1602 LCD display to write from MCU to the module. I have checked the wire connection for a lot of times, but still only backlight no text. So I am wondering whether there is possible that the display function has been burned out? Is there possible that the backlight works well but the display text is damaged?

I have it connected as follows from the Arduino LiquidCrystal page:

Ardino LCD connection diagram

And the code taken from the same page is as follows:

// include the library code:
#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() {
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.print("hello, world!");
}

void loop() {
  // set the cursor to column 0, line 1
  // (note: line 1 is the second row, since counting begins with 0):
  lcd.setCursor(0, 1);
  // print the number of seconds since reset:
  lcd.print(millis()/1000);
}

Best Answer

You need to set the contrast. The contrast is probably too low, making the "hello, world!" virtually invisible.

You can try out some combinations of 2 resistors, to create a voltage divider yourself. My 2 LCD displays need V0 to be 0.8V and 1.1V respectively, to give you some indication.

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