LCD Screen Not Turning On

Other Hardware Displays
1

My lcd screens are never turning on. When I try any setup, lcd screen, breadboard or components I can find, my lcd screen just goes blank, except for the fact that the backlight turns on. I have checked the wiring multiple times, made sure I'm using the right screen for the setup, and anything I can think to try, but no matter what I do, it seems to make no difference. I am mainly using the setup and components from the ELEGOO Mega 2560 and ELEGOO 37 in 1 sensor kit. Can someone please help?

2

Yes

We need some additional information.
Post your sketch, well formated, with well-tempered comments and in so called code tags "< code >" and a detailed circuit diagram to see how we can help.
Have a nice day and enjoy coding in C++.

3

Here is my sketch:

//www.elegoo.com
//2016.12.9

/*
  LiquidCrystal Library - Hello World

 Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
 library works with all LCD displays that are compatible with the
 Hitachi HD44780 driver. There are many of them out there, and you
 can usually tell them by the 16-pin interface.

 This sketch prints "Hello World!" to the LCD
 and shows the time.

  The circuit:
 * LCD RS pin to digital pin 7
 * LCD Enable pin to digital pin 8
 * LCD D4 pin to digital pin 9
 * LCD D5 pin to digital pin 10
 * LCD D6 pin to digital pin 11
 * LCD D7 pin to digital pin 12
 * LCD R/W pin to ground
 * LCD VSS pin to ground
 * LCD VCC pin to 5V
 * 10K resistor:
 * ends to +5V and ground
 * wiper to LCD VO pin (pin 3)

 Library originally added 18 Apr 2008
 by David A. Mellis
 library modified 5 Jul 2009
 by Limor Fried (http://www.ladyada.net)
 example added 9 Jul 2009
 by Tom Igoe
 modified 22 Nov 2010
 by Tom Igoe

 This example code is in the public domain.

 http://www.arduino.cc/en/Tutorial/LiquidCrystal
 */

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

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(7, 8, 9, 10, 11, 12);

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);
}

This is the wiring diagram:
LCD Wiring Diagram.pdf (276.9 KB)

By the way, thanks for replying so fast!

4

What happens when you turn that trim pot?

5

Nothing changes on the screen.

6

Then it looks like either the trim pot is not making connections correctly with the bread board, or your LCD is broken or not compatible with the code.

7

I've tried about three lcd screens, though. Unless they all came broken, which they shouldn't have, because ELEGOO is a fairly reliable brand.

8

:rofl:

9

Show also a photo of your actual setup.

10

It worked. I am guessing that it is because I was previously running an old Lenovo running Windows 10. The Lenovo ran drastically slow, and I tried it on my Raspberry Pi 4 and it worked. :confused: Thanks for reminding me to try wiring it again @6v6gt

11

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