Circuit Documentation

Summary

This circuit is designed to interface an Arduino UNO with a 16-pin LCD display and a trimmer potentiometer. The LCD is used to display messages, while the trimmer potentiometer allows for adjusting the contrast of the display. A resistor is included in the circuit to limit current where necessary.

Component List

1. Arduino UNO

• Description: A microcontroller board based on the ATmega328P. It is used to control the circuit and execute the programmed code.
• Purpose: Acts as the main controller for the circuit, managing the LCD display and reading the potentiometer.

2. Trimmer Potentiometer

• Description: A variable resistor used to adjust the voltage level.
• Purpose: Used to control the contrast of the LCD display.

3. LCD Display (16 pin)

• Description: A 16x2 character LCD that can display alphanumeric characters.
• Purpose: Displays messages and information to the user.

4. Resistor

• Description: A passive electrical component that limits the flow of current in the circuit.
• Purpose: Used to limit current to the LCD display and ensure proper operation.

Wiring Details

Arduino UNO

• 5V connected to:

  • Resistor (pin1)
  • LCD Display (VDD)
  • Trimmer Potentiometer (leg1)

• GND connected to:

  • LCD Display (VSS)
  • LCD Display (K)
  • LCD Display (R_W)
  • Trimmer Potentiometer (leg2)

• D12 connected to:

  • LCD Display (RS)

• D11 connected to:

  • LCD Display (E)

• D5 connected to:

  • LCD Display (DB4)

• D4 connected to:

  • LCD Display (DB5)

• D3 connected to:

  • LCD Display (DB6)

• D2 connected to:

  • LCD Display (DB7)

LCD Display

• VO connected to:

  • Trimmer Potentiometer (wiper)

• A connected to:

  • Resistor (pin2)

Documented Code

#include <LiquidCrystal.h>

// Initialize the library with the numbers of the interface pins
// RS, E, D4, D5, D6, D7
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() {
  // Set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.print("Hello, World!");
}

void loop() {
  // Nothing to do here
}

This documentation provides a comprehensive overview of the circuit, detailing each component, its purpose, and the wiring connections. The included code initializes the LCD and displays a message, demonstrating the functionality of the circuit.