Smart Guage

Components (Things You will need)

Building the circuit

Things Needed:

• Arduino Uno Board: 1
• Arduino USB cable: 1
• Breadboard: 1
• Red LED = 1
• Green LED = 1
• Ultrasonic sensor = 1
• Jumper Wires.

Mounting the component on the breadboard

Things needed:

• Ultrasonic Sensor = 1
• Breadboard =1
• Red LED = 1
• Green LED = 1

Step 1: Take the breadboard and the ultrasonic sensor and insert it into the vertical connectors on the breadboard.

Step 2: Take the Red and green LED and insert it into the vertical connectors on the breadboard beside the ultrasonic sensor as

Step 3: Connect a resistor to the positive pin of the red LED and another to the positive pin of the green LED on the vertical connectors on the breadboard as shown below.

WIRING THE CIRCUIT

Things Needed:

• Red male-to-male jumper wire: 1
• Black male-to-male jumper wire: 1
• White male-to-male jumper wire: 1
• Blue male-to-male jumper wire: 1
• Brown jumper wire: 1
• Green Jumper Wire: 1

Step 1: Connect one end of the red male-to-male jumper wire to the VCC pin of the ultrasonic sensor on the breadboard and the other end to 5V on the Arduino UNO as shown below.

Step 2: Connect one end of the black male-to-male jumper wire to the TRIG pin of the ultrasonic sensor on the breadboard and the other end to digital pin number 9 on the Arduino UNO as shown below.

Step 3: Connect one end of the white male-to-male jumper wire to the ECHO pin of the ultrasonic sensor on the breadboard and the other end to digital pin number 10 on the Arduino UNO as shown below.

Step 4: Connect one end of the blue male-to-male jumper wire to the GND pin of the ultrasonic sensor on the breadboard and the other end to GND on the Arduino UNO as shown below.

Step 5: Connect one end of the green male-to-male jumper wire to the positive pin of the red LED and the other end to digital pin 13 on the Arduino Uno board as shown in the picture below.

Step 6: Connect one end of the brown male-to-male jumper wire to the negative pin of the red LED on the breadboard to GND on the Arduino UNO.

Step 7: Connect one end of the yellow male-to-male jumper wire to the positive pin of the green LED on the breadboard to digital pin number 7 on the Arduino UNO through the resistor as shown below.

Step 8: Connect one end of the orange male-to-male jumper wire to the negative pin of the red LED on the breadboard to GND on the Arduino UNO.

// Include comments to explain the code
const int trigPin = 9;    // Trigger pin of ultrasonic sensor
const int echoPin = 10;   // Echo pin of ultrasonic sensor
const int redLed = 6;     // Pin connected to Red LED
const int greenLed = 7;   // Pin connected to Green LED

long duration;  // Variable to store duration of sound wave travel
int distance;   // Variable to store distance calculated

void setup() {
  // Set up the pins as input or output
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(redLed, OUTPUT);
  pinMode(greenLed, OUTPUT);

  // Start serial communication
  Serial.begin(9600);
}

void loop() {
  // Clear the trigPin by setting it LOW
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);

  // Set the trigPin HIGH for 10 microseconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Read the echoPin, and calculate the distance
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;  // Convert to distance in cm

  // Print the distance to the Serial Monitor
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  // LED control based on distance
  if (distance < 10) {  // If object is within 10 cm
    digitalWrite(redLed, HIGH);  // Turn on Red LED
    digitalWrite(greenLed, LOW); // Turn off Green LED
  } else {
    digitalWrite(redLed, LOW);   // Turn off Red LED
    digitalWrite(greenLed, HIGH); // Turn on Green LED
  }

  // Delay to allow for stable readings
  delay(500);
}