Arduino - no display in the LCD

Projects General Guidance
1

Hi.

i'm a new bee to Arduino and this is my first project to display text in LCD - but stuck with an issue, please can you help. LCD is lights up but it does not displays any text.

I have tried my best and followed instruction to connect the pins and i reckon i failed in some connection - but cannot find it, please help me where i have made mistake? Thanks.

  • 10K Potentiometer
  • 16x2 LCD
  • Uno Arduino Board
  • Breadboard

I have attached images from the connection setup and followed below links/tutorial as ref to build it. pls can you help me where i'm making mistake? thanks.

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

LiquidCrystal lcd(7,8,9,10,11,12);

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

void loop() {
  // set the cursor to column 0, line 1
  lcd.setCursor(0, 1);
  lcd.print("Hello...");

  // print the number of seconds since reset:
  lcd.print(millis() / 1000);
}

https://learn.adafruit.com/assets/898
https://learn.adafruit.com/assets/2364
https://create.arduino.cc/projecthub/Guitarman1/displaying-sensor-values-on-lcd-c0c44f

Regards
Venu

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2

Show us a photo of your wiring. Have you tried adjusting the contrast potentiometer? Does anything (black blocks) appear on the display?

How to post images.

3

just posted the images in the main post for your review. no change in LCD with change in potentiometer :frowning:

4

The potentiometer needs to be on the same side of the center channel of the breadboard as the wiring. As it is the pot is connected to nothing.

pot wiring.jpg

5

Thanks. that did the magic.. one step forward.. i can see the display now but it is not same text i wanted to print.

Please can you help? thanks.

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6

I see no ground wire from the Uno to the breadboard. I have wired up a LCD according to your code and ran your code. The display works fine for me.

7

that did the magic :).

thanks for your help - it has really helped.