ESP32 I2C LCD 1602 Display Project
Traffic light with LCD display controlled by ESP32
Objective of this project:
The objective of this project is to create a traffic light following these steps:
- The red LED lights up for 3 seconds, displaying “Stop” on the LCD display.
- After 3 seconds the red LED goes out and another green LED lights up, also for 3 seconds, displaying “Cross”
- Once the green LED is off, a third, orange LED lights up for 2 seconds, displaying “Cross quickly”.
- Then the program resumes in a loop.
Necessary components
- ESP32
- Green LED
- Yellow LED
- Red LED
-
Connecting wires
- LCD display
Mounting
To carry out the assembly, you can connect:
LEDs :
-
the terminal (+) of green LED to pin D18 of the ESP32 board
-
the yellow LED (+) terminal to pin D5 of the ESP32 board
-
the red LED (+) terminal to pin D2 of the ESP32 board
-
the terminal (-) of each LED has GND of the ESP32 board
For display LCD:
-
the SCL pin to pin D22 of the ESP32 board
-
the SDA pin to the D21 pin of the ESP32 board
-
the VCC pin to 5v of energy
-
the GND to GND pin of the ESP32 board
Arduino program
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#include <LiquidCrystal_I2C.h> LiquidCrystal_I2C lcd(0x27, 20, 4); void setup(){ lcd.init(); pinMode(2,OUTPUT); // For Red LED pinMode(5,OUTPUT); // For Yellow LED pinMode(18,OUTPUT); // For Green LED } void loop(){ lcd.backlight(); lcd.clear(); digitalWrite(2,HIGH); //the red LED lights up digitalWrite(18,LOW); digitalWrite(5,LOW); lcd.setCursor(0, 0); lcd.print("STOP"); // Display the word 'STOP' on the LCD display delay(3000); lcd.clear(); digitalWrite(2,LOW); digitalWrite(18,HIGH); //the green LED lights up digitalWrite(5,LOW); lcd.print("Traversez"); //Display the word 'Traversez'(cross) on the LCD display delay(3000); lcd.clear(); digitalWrite(2,LOW); digitalWrite(18,LOW); digitalWrite(5,HIGH); // the yellow LED lights up lcd.print("Traversez vite"); //Display the word 'traversez vite (cross quickly) on the LCD display delay(1000); } |
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