Wire Lcd Display

Other Hardware Displays
1

Hi!
I want to connect a lcd display to my Arduino Nano 33 IoT. I did everything as described in the datasheet:

Unbenannt
Unbenannt723×836 167 KB

And wrote this code:

#include <LiquidCrystal.h>
LiquidCrystal lcd(2,4, 8, 9, 10, 11);
void setup() {
  // put your setup code here, to run once:
 
  lcd.begin(16, 2);
  lcd.setCursor(0,0);
  lcd.print("Hello");
}

void loop() {
  // put your main code here, to run repeatedly:
  

  
}

Unfortunately the display isn´t showing anything. I don´t really know what´s wrong. Hopefully you can help me.

Thanks in advance!

2

Can you tell which datasheet that is ?
Which display is it ? Most LCD displays are for 5V boards, such as a Arduino Uno.
I think that there should be a potentiometer or a resistor to control the contrast.

3

this is the Link to the datasheet. I know I saw some videos, but unfortunately I don´t have a potentiometer or resistor at home.

4

It is an error in the datasheet. The pot is shown in the connection diagram for raspberry pi, but not shown in the connection diagram for Arduino. The pot is always required.

5

Well you are not in a very good position to do anything with Arduinox or displays then, are you? :astonished:

Just to start with, connect pin 3 on the display ("Vo") to ground. You should get a display. Later, you will want a 1k (not a 10k) potentiometer to connect one end to ground and the wiper to "Vo" to adjust the contrast.

Or just as readily, get a multi-resistor pack which should only be a few dollars and try a few values such 120, 220, 330, 470, 680 or 1k Ohms between "Vo" and ground.

I might just add that the idea of connecting "Vo", pin 3 of the display to PWM "pin 3" on the Arduino is a rather stupid idea someone had to "imitate" a potentiometer. It never works - except when you set the PWM value to zero and the pin is thereby effectively grounded in a rather silly fashion.
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