Need help on 16020A LCD Display (16x3)

Using Arduino Displays
1

I need help here.A newbie in arduino.I currently have an Uno r3.So i recently tried testing out my new lcd display.I wasnt working.Rechecked my wiring 3 times but all i see is black boxes.I tried setting the contrast but it dosent help.For anybody wondering,here is the code

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

// Creates an LCD object. Parameters: (rs, enable, d4, d5, d6, d7)
LiquidCrystal lcd(13, 12, 6, 5, 4, 3);

void setup() 
{
	// set up the LCD's number of columns and rows:
	lcd.begin(16, 2);

	// Clears the LCD screen
	lcd.clear();
}

void loop() 
{
	// Print a message to the LCD.
	lcd.print(" Hello world!");

	// 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 a message to the LCD.
	lcd.print(" LCD Tutorial");
}

Thank you for anyone helping out :smiley:

2

Welcome! Great job posting the code. I’m assuming this is the classic LCD wiring assembly. You might want to proofread your question for clarity.

I couldn’t find any information on a 16020A LCD display (16x3), but I do have details on a 1602 (16x2) display. Your question suggests you’re using a 3-line display, but your code initializes a 2-line display. Could that mismatch be causing the issue? Let’s investigate further!

3

Please show us you wiring.

4

Along with the other replies, this contrast potentiometer is usually on an "I2C backpack" only. Would you post a picture of the reverse side of your LCD?

5

we can't see your wiring. Please post pictures.

very common problems with 4bit parallel connection are

  • missing ground connection for RW
  • breadboard power rails with interruption
  • unsoldered header on the LCD producing unreliable contacts
  • wrong contrast wiring

I propose you check the "Related topics" also.