20 replies

Why isn't my "Hello World" displaying on the LCD screen despite correct connections and power?

Hey Devs , I've been trying to make this simple LCD screen circuit that displays "Hello World".
I have made my connections like this
And my code is very simple

 int rs = 7, en = 8, d4 = 9, d5 = 10, d6 = 11, d7 = 12, readPin = A2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

void setup() {
  // put your setup code here, to run once:
  lcd.begin(16, 2);
  //16 columns, 2 rows
  pinMode(readPin,INPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  lcd.setCursor(0, 1);
  lcd.print("Hello World");
  lcd.print(millis()/1000);
  Serial.println(analogRead(readPin));
}

 int rs = 7, en = 8, d4 = 9, d5 = 10, d6 = 11, d7 = 12, readPin = A2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

void setup() {
  // put your setup code here, to run once:
  lcd.begin(16, 2);
  //16 columns, 2 rows
  pinMode(readPin,INPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  lcd.setCursor(0, 1);
  lcd.print("Hello World");
  lcd.print(millis()/1000);
  Serial.println(analogRead(readPin));
}

I have triple-checked the connections and have even dismantled and reconnected everything twice, but nothing seems to help.

My soldering of the headpins on the LCD also seems fine.

I have already tried the following:

Disconnecting all data pins connecting only the power pins to get a row of black boxes on the top.
Adjusting the potentiometer.
Connecting both ends of the potentiometer to GND, as suggested by someone on some other forum thread.
Checking if my potentiometer is defective. I disconnected everything and performed an analogRead on the potentiometer(as shown in the code), and the potentiometer correctly varies from 0 to 1023 on turning its wheel.
None of these have helped. Since the lights are turning on, I don't think there's a problem with the LCD either. Can anyone please help me out?