Chapter 18 LCD1602

In this chapter, we will learn about the LCD1602 Display Screen

Project 18.1 LCD1602

In this section we learn how to use LCD1602 to display something.

Component List

ESP32-S3-WROOM x1
GPIO Extension Board x1
830 Tie-Points Breadboard x1
LCD1602 IIC x1
F-M DuPont Cable x4

Connect

Sketch

How to install the library

We use the third party library LiquidCrystal I2C. If you haven’t installed it yet, please do so before learning. The steps to add third-party Libraries are as follows: open arduino ‣ Sketch ‣ Include library ‣ Add .zip Library. Select Super_Starter_Kit_for_ESP32_S3/C/Libraries/LiquidCrystal_I2C.zip for installation.

Use I2C LCD 1602 to display characters and variables.

Sketch_18.1_Display_the_string_on_LCD1602

Compile and upload the code to ESP32-S3 WROOM and the LCD1602 displays characters.

Code

The following is the program code:

#include <LiquidCrystal_I2C.h>
#include <Wire.h>

#define SDA 14                    //Define SDA pins
#define SCL 13                    //Define SCL pins

/*
* note:If lcd1602 uses PCF8574T, IIC's address is 0x27,
*      or lcd1602 uses PCF8574AT, IIC's address is 0x3F.
*/
LiquidCrystal_I2C lcd(0x27,16,2);
void setup() {
Wire.begin(SDA, SCL);           // attach the IIC pin
if (!i2CAddrTest(0x27)) {
    lcd = LiquidCrystal_I2C(0x3F, 16, 2);
}
lcd.init();                     // LCD driver initialization
lcd.backlight();                // Open the backlight
lcd.setCursor(0,0);             // Move the cursor to row 0, column 0
lcd.print("hello, world!");     // The print content is displayed on the LCD
}

void loop() {
lcd.setCursor(0,1);             // Move the cursor to row 1, column 0
lcd.print("Counter:");          // The count is displayed every second
lcd.print(millis() / 1000);
delay(1000);
}

bool i2CAddrTest(uint8_t addr) {
Wire.beginTransmission(addr);
if (Wire.endTransmission() == 0) {
    return true;
}
return false;
}