Circuit Documentation

Summary of the Circuit

This circuit integrates an ESP32 microcontroller with a 16x2 I2C LCD screen. The ESP32 is responsible for controlling the display on the LCD, showing messages in a loop with specified delays. The communication between the ESP32 and the LCD is established via the I2C protocol, utilizing two data lines: SCL (Serial Clock Line) and SDA (Serial Data Line).

Component List

ESP32 (30 pin)

• Description: A microcontroller with Wi-Fi and Bluetooth capabilities, featuring a wide range of GPIO pins.
• Pins: EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, GND, Vin, D23, D22, TX0, RX0, D21, D19, D18, D5, TX2, RX2, D4, D2, D15, 3V3
• Purpose: Acts as the main controller for the circuit, interfacing with the I2C LCD screen to display messages.

I2C LCD 16x2 Screen

• Description: A liquid crystal display capable of showing 16 characters per line across 2 lines.
• Pins: SCL, SDA, VCC (5V), GND, VDD, VO, RS, RW, E, D0, D1, D2, D3, D4, D5, D6, D7, BLA, BLK
• Purpose: Displays the information sent from the ESP32 microcontroller.

Wiring Details

ESP32 (30 pin)

• GND connected to I2C LCD 16x2 Screen GND
• Vin connected to I2C LCD 16x2 Screen VCC (5V)
• D22 connected to I2C LCD 16x2 Screen SCL
• D21 connected to I2C LCD 16x2 Screen SDA

I2C LCD 16x2 Screen

• GND connected to ESP32 GND
• VCC (5V) connected to ESP32 Vin
• SCL connected to ESP32 D22
• SDA connected to ESP32 D21

Documented Code

/*
 * This Arduino Sketch interfaces an ESP32 with an I2C LCD 16x2 screen.
 * The ESP32 displays two messages on the LCD screen in a loop with delays.
 * Connections:
 * - ESP32 GND to LCD GND
 * - ESP32 Vin to LCD VCC (5V)
 * - ESP32 D22 to LCD SCL
 * - ESP32 D21 to LCD SDA
 */

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

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
  lcd.print("Welcome");
  delay(2000);
  lcd.init();
  lcd.backlight();
  lcd.print("EV CHRG");
  delay(2000);
}

void loop() {
  delay(1000);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("SLOT1");
  delay(2000);
}

Filename: sketch.ino

Description: The code initializes the I2C LCD screen and prints the messages "Welcome" and "EV CHRG" on the display, followed by "SLOT1" in a continuous loop. The ESP32 communicates with the LCD using the I2C protocol, with the SCL and SDA pins connected to the corresponding pins on the LCD.