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Values Display on LCD in Arduino

The project is base on Arduino Uno R3, where the article going to explain how to setup the unit to display value on LCD. Here we are using a sensors value to display on Arduino. Let’s begin with the list of components;

List of components

  1. Arduino Uno R3 or Genuine Uno
  2. Jumper wires
  3. Solder-less breadboard
  4. Rotary Potentiometer
  5. 16 X 2 LCD standard Adafruit (white on blue)
  6. 103 trim pot PotentiometerRMO65 10K Ohm
  7. 102 trim pot PotentiometerRMO65 1K Ohm

You could select any of the color display; here selected LCD is display is display in blue and the font will be display as white.


About the project

The project uses 2 Potentiometers breadboard link to an Arduino and LCD. The outcome of the project is that the LCD should designate the values of Potentiometers when they are adjusted.


Let’s Assemble Arduino

The LCD configuration is looks like below;


Out of above pins in the diagram, there are some specific pins you should know well before starting our journey.

  1. Ground Connection – GND
  2. +5v Connection – VCC
  3. Analog pin used for screen brightness, connects to Potentiometer – VO
  4. The ping which tell LCD what will be written to it – RS
  5. The read/write pins – R/W
  6. The ping which tell the LCD whether data is ready. – E
  7. Bus lines for the LCD (Arduino to LCD) – D0 to D7
  8. +5V for the backlight – A
  9. Ground pin for the backlight – K


Steps of wiring

  • Tie the 10K Ohm Potentiometer. The central pin of Potentiometer is linked to the VO pin and the extra two wires are connected to +5V and ground on the breadboard. This Potentiometer is used to switch the contrast of the LCD.
  • Tie pin-A to the +5V and pin-K to ground on the breadboard.
  • Join pin-D7 to digital pin 12, pin-D6 to digital pin 11, pin-D5 to digital pin 10 and pin-D4 to digital pin 9. Here digital pins are on the Arduino.
  • Link pin-RS to digital pin 7 on the Arduino.
  • Connect pin-RW to ground on the breadboard.
  • Fix pin-VSS to ground on the breadboard.
  • Join pin-VDD to +5V on the breadboard.
  • Attach pin-E to digital pin 8 on the Arduino.
  • Locate the primary Potentiometer on the board and link the middle pin to Analog Pin 1 on the Arduino and the additional pins to ground and +5V on the breadboard.
  • Select the subsequent Potentiometer on the board and join the midpoint pin to Analog Pin 2 on the Arduino and the extra pins to ground and +5V on the breadboard.





Source Code Implementation


// include the library

#include <LiquidCrystal.h>


// initialize the library with the numbers of the interface pins

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


int potPin1 = A1;

int potPin2 = A2;


void setup()


        // set up the LCD’s number of columns and rows

        lcd.begin(16, 2);



        pinMode(potPin1, INPUT);

        pinMode(potPin2, INPUT);



void loop()


        lcd.setCursor(0,0); // Sets the cursor to col 0 and row 0

        lcd.print(“SensorVal1: “); // Prints Sensor Val: to LCD

        lcd.print(analogRead(potPin1)); // Prints value on Potpin1 to LCD

        lcd.setCursor(0,1); // Sets the cursor to col 1 and row 0

        lcd.print(“SensorVal2: “); // Prints Sensor Val: to LCD

        lcd.print(analogRead(potPin2)); // Prints value on Potpin1 to LCD


You can copy the code and upload to the Arduino and fine-tune the Potentiometers as per your requirement. The LCD display will demonstration two lines with the values of respective Potentiometers . You can alter the B10K Potentiometer to guarantee the divergence of the LCD is faultless to the read the value.


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