In this quick instructable I'll show you how to lunch LCD with I2C Serial Adapter on NodeMCU v2 using ArduinoIDE and available libraries.

Step 1: Required Parts and Software

Hardware:

1. NodeMCU v2

2. 16x2 LCD Display with i2c Serial Interface Adapter Module

3. Some wires, USB for power supply and sketch uploading

Software:

1. ArduinoIDE - https://www.arduino.cc/en/main/software

2. LiquidCrystal_I2C library - https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library

Step 2: Hardware Setup

Preparations:

When you order LCD from Ali/ebay you can solder 16 pin headers to LCD display in order to avoid 'wiring mess' when connecting to serial adapter

Setup:

Place LCD display and Serial Adapter on bread board next to each other
Connect adapter's SCL pin with NodeMCU D1 pin
Connect adapter's SDA pin with NodeMCU D2 pin
Connect adapter's GND, VCC pins with NodeMCU GND, Vin accordingly - here I need to explain one thing. Basically you should connect LCD display to 5v source but NodeMCU only has 3.3v outputs so the LCD is pretty dark. If you provide LCD with external 5v source you'll need to use logic level converter because it will not work. Here I used some hack using USB provided power that is bypassed to Vin. It's 5V but it works :)

Step 3: The Sketch

Preparations:

Install ArduinoIDE
Add NodeMCU support - nicely described here.
Add LiquidCrystal_I2C library - please use instructions provided by author. Installation from AdruinoIDE will add outdated version

The Sketch:

#include <LiquidCrystal_I2C.h>

#include <Wire.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {

Serial.begin(115200);

//Use predefined PINS consts

Wire.begin(D2, D1);

lcd.begin();

lcd.home();

lcd.print("Hello, NodeMCU");

}

void loop() { // do nothing here }

---------------------

Upload the sketch and you're done!

Be the First to Share

Recommendations

Meditation/Breathing Practice Light by Makertronics in Health

3 187

Pocket Weather Station | Your Self-Care Weather Assistant on the Go by Aarav G in Arduino

11 945

Neon Ring Counter Heart by Zycenios in Electronics

2 511

Making a Tiny Mac From a Raspberry Pi Zero by cgenco in Raspberry Pi

48 2.3K

Microcontroller Contest
Automation Contest
Make it Glow Contest

13 Comments

ar.khan9983ar

Question 4 months ago on Step 1

after connecting with Vin , as you mentioned its 5V : ) LCD is not turning on . I also connected 16 to 4 pin converter with LCD

kuzayet3

5 months ago

Please, I am using a 3v NodeMCU. My LCD lights come on but I tried uploading the code but it doesn't display. I adjusted the potentiometer/contrast but still no text displayed. I need your help please

HimajaK1

Question 2 years ago on Step 3

Hey!
I tried this code, connections ,I also included the LCD library mentioned but then I am getting this error. Kindly get back ASAP!
Thanks:)

SudharsanS9

2 years ago

What library should I include?

ramonblack1987

2 years ago

1.//**************Ejemplo para Placa NodeMcu V3 Lolin Version 0.1*****************

// By Godbad , Colombia

#include <Wire.h> // Libreria para configurar los puertos Base

#include <LiquidCrystal_I2C.h> //Libreria para manejar LCD

LiquidCrystal_I2C lcd(0x27, 16, 2); // Protocolo 0x27 para este tipo de LCD, 16 para la cantidada de caracteres por linea , cantidad de Lineas en el LCD que son 2

Ejemplo de nuestro LCD

X|X|X|X|X|X|X|X|X|X|X|X|X|X|X|X

void setup()

{

pinMode(2, OUTPUT);

Wire.begin(D2, D1); // D1 = SCL | D2 = SDA

lcd.init(); // Iniciamos el LCD

lcd.backlight(); // Prendemos la Iluminacion del LCD

lcd.clear();

}

void loop()

{