Arduino Analog Voltage Reader and LED Control

This Arduino sketch reads analog voltage values from four input pins (A0, A1, A2, A3) and outputs these values to the serial monitor. Additionally, it controls an LED connected to digital pin 13 based on the voltage value from A0.

Features

• Reads voltage values from analog pins: A0, A1, A2, and A3.
• Outputs the voltage readings to the serial monitor.
• Turns an LED ON or OFF based on the voltage value from A0.

Circuit Diagram

1. Connect analog sensors or voltage sources to the following pins:
   • A0
   • A1
   • A2
   • A3
2. Connect an LED to digital pin 13 with a current-limiting resistor.

Code Explanation

• Pin Initialization:
  • Analog pins A0, A1, A2, A3 are set as inputs.
  • Digital pin 13 is set as output for the LED.
• Serial Communication:
  • The serial monitor is initialized at 9600 baud rate.
  • Voltage readings are printed as Variable_1, Variable_2, Variable_3, and Variable_4.
• LED Control:
  • The LED on pin 13 is turned ON if the voltage read from A0 is below 10. Otherwise, it is turned OFF.

Code

int led = 13;

int voltage = A0;
int voltage1 = A1;
int voltage2 = A2;
int voltage3 = A3;

int vol = 0;
int vol2 = 0;
int vol3 = 0;
int vol4 = 0;

void setup() {
  pinMode(voltage, INPUT);
  pinMode(voltage1, INPUT);
  pinMode(voltage2, INPUT);
  pinMode(voltage3, INPUT);

  pinMode(13, OUTPUT);

  Serial.begin(9600);
}

void loop() {
  vol = analogRead(voltage);
  Serial.print("Variable_1: ");
  Serial.println(vol);

  vol2 = analogRead(voltage1);
  Serial.print("Variable_2: ");
  Serial.println(vol2);
  delay(99);

  vol3 = analogRead(voltage2);
  Serial.print("Variable_3: ");
  Serial.println(vol3);
  delay(99);

  vol4 = analogRead(voltage3);
  Serial.print("Variable_4: ");
  Serial.println(vol4);
  delay(99);

  if (vol < 10) {
    digitalWrite(led, HIGH);
  } else {
    digitalWrite(led, LOW);
  }
}