Lesson-05 : Introduction to the interfacing of LCD with Arduino Uno

We will start with introduction to LCD then will see interfacing of Arduino Uno with LCD.

LCD(Liquid Crystal Display)

A liquid crystal display or LCD draws its definition from its name itself. It is a combination of two states of matter, the solid and the liquid. LCD uses a liquid crystal to produce a visible image. Liquid crystal displays are super-thin technology display screens that are generally used in laptop computer screens, TVs, cell phones and portable video games. LCD’s technologies allow displays to be much thinner when compared to a cathode ray tube (CRT) technology.

Interfacing LCD with Arduino

Components Required:

1. Arduino Uno with usb cable

2. 16*2 LCD display

3. 1k potentiometer

4. Jumper wires (Male to Male (15))

5. Breadboard

6. 220 resistor

Arduino connections explained in steps

• Insert the LCD into the breadboard

• Connect the +ve rail with the +5v and –ve with the gnd of Arduino

• Connect the 1st pin which is Vss of LCD to –ve rail

• Connect the 2nd pin which is Vdd of LCD to +ve rail

• Connect the middle pin of the potentiometer to the 3rd pin of the LCD which is VE(contrast)

• Connect the other pins of potentiometer to the +ve and –ve rail of the breadboard

• Connect the 4th pin RS to digital pin 12 of Arduino

• Connect the 5th pin READ/WRITE to the –ve rail

• Connect the 6th pin E to the digital pin 11 of Arduino

• Leave the pins from D0 – D3 on LCD

• Connect the D4 of LCD to the digital pin 5 of Arduino

• Connect the D5 of LCD to the digital pin 4 of Arduino

• Connect the D6 of LCD to the digital pin 3 of Arduino

• Connect the D7 of LCD to the digital pin 2 of Arduino

• Connect the 15th pin of LCD to +ve rail through 220 Ohm resistor

• Connect the 16th pin of LCD to –ve rail

Pre-coding explained in steps

1. Define the Pin Mode in the void Setup

2. Define the logic in the void Loop

3. Library used is <LiquidCrystal.h>

Functions used in this example:

1. pinMode(Pin_Number, IN/OUT); to set the mode i.e. input or output for example pinMode(3,OUTPUT);

2. digitalWrite(Pin_Number,LOW/HIGH); to set the pin as High or low for example digitalWrite(3,LOW);

3. delay(microseconds) to put a time delay between two instructions. For example delay(1000) i.e. 1 sec delay

4. lcd.begin(16, 2); to initialise the LCD

5. lcd.setCursor(0, 1); to set the cursor point

6. lcd.print("hello, world!"); to print on the LCD

Thank you guys that is it in this lesson. If you want to learn more about Arduino based projects do register for IoT course provided by Nation innovation.