White Squares on a 1602A lcd screen

[squeakycheese72]

Issue with 1602A lcd screen arduino mega 2560

I am struggling here, I have an elegoo mega 2560 and a 1602A screen

i followed a diagram on the forum to wire it up because i am relatively new to arduino.

Im not sure what else to write here other than the code is here and a labeled image, i would attach an image of the arduino but im a new user.

#include <LiquidCrystal.h>

LiquidCrystal lcd(2, 3, 4, 5, 11, 12);

void setup() {
lcd.begin(2, 16);
}

void loop() {
lcd.print("Hello");
{

Thanks for any help!

[J-M-L]

do you have a way to adjust the contrast of the screen (often there is a potentiometer)? it might be to high thus you only see the white squares

[groundFungus]

lcd.begin(2, 16);

Shouldn't that be (16,2)?

LiquidCrystal lcd(2, 3, 4, 5, 11, 12);
And this should be (12, 11, 5, 4, 3, 2) according to the wiring in the photo (best that I can tell).

Almost all of the LCD tutorials have the wiring of the contrast pot wrong. It is a mistake that has been perpetuated through the years. The right way is to wire the one end of the pot to ground and the wiper to LCD pin 3 (V0). The other end of the pot is left disconnected. So the pot is a variable resistor. Actually I find that a 1K fixed resistor from ground to Vo gives me satisfactory contrast on virtually every LCD that I have tried.

void loop() {
lcd.print("Hello");
{  // this is an opening bracket, needs a closing bracket }

That loop will just spam the display. Move the lcd.print to setup so that it just prints once.

[sterretje]

@squeakycheese72, your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with your project See About the Installation & Troubleshooting category.

Please edit your post, select all code and click the </> button to apply code tags and next save your post. It makes it easier to read, easier to copy and prevents the forum software from incorrect interpretation of the code.

[Paul_B]

Taking photos in the dark is not really helpful either.

[squeakycheese72]

Hi! Thanks for taking the time to respond but I think I'm just gonna stop with the screen because I am very new to Arduino and have only learnt how to wire up a light and sevo, I should probably learn Arduino before attempting these things.

Have a great day and sorry for the late response