Cant print anything onto LCD screen

Other Hardware Displays
1

I have an LCD screen 16x2 4 pin which I cant seem to print on. I use an arduino nano with the code LQFP32 and I have the wires connected as
VCC > 5v
GND > GND
SDA > A4
SCL > A5
I can communicate fine with the LCD, I have ran scans to check if its connected and I am also able to control things like the backlight. Just nothing prints onto the LCD.

here is the code I have been trying to use :

#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

char data = "h";


void setup() {
  lcd.init();
  Serial.begin(9600);
  lcd.begin(16, 2);
  lcd.clear();
  lcd.backlight();
  delay(200);
  lcd.print(data);
}

void loop() {
  
}
2

First of all, this line is wrong:
char data = "h";

Try :
char data = 'h';

Then what appears on your LCD?

Post a LCD image.

3

char *data = "hello noob"; // declares an 11 char string array

You might need to set the cursor position....

4

didnt change anything

5

Tried that and nothing happened

6

Here work...

Show your LCD project image,

7

im not quite sure how that website works but that is the same setup I have but I use an arduino nano instead of uno.

8

I will change to nano....

9

thats correct

10

How do you set the contrast of your LCD?

11

im not sure what you mean, I havent done anything with the contrast

12

You seem to be having more problems with this "Nano" which uses a clone of the ATmega328P chip based on your previous thread: Arduino nano prints random characters

Google for "LGT8F328P arduino i2c problem"

13

The I2C backpack has a blue potentiometer which you adjust to optimise the display performance.

1 Like
14

This is why others here ask you to post your code and circuit diagram.

The more information you provide, the faster and more likely you'll receive a solution.

15

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