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atd.ino
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atd.ino
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// Ultrasonic Sensor (HC-SR04)
/* Components:
1 Arduino (Uno R3)
1 4-Pin Ultrasonic Sensor (HC-SR04)
3 LEDs (Red, Yellow, Green)
*/
/* Details:
Ultrasonic --> Arduino
VCC --> 5V
GND --> GND
ECHO --> (Digital Pin) 12
TRIG --> (Digital Pin) 13 (You can change the wiring/code to reflect changes with ECHO/TRIG)
*/
#define trigPin 12
#define echoPin 13
#define highThreat 10
#define medThreat 9
#define noThreat 8
void setup() {
Serial.begin(9600);
pinMode(trigPin, OUTPUT); // Microphone
pinMode(echoPin, INPUT); // Speaker
pinMode(highThreat, OUTPUT); // Red LED
pinMode(medThreat, OUTPUT); // Yellow LED
pinMode(noThreat, OUTPUT); // Green LED
}
void loop() {
long duration, distance;
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance = (duration/2) / 29.1;
if (distance >= 400 || distance <= 2) {
Serial.println("OUT OF RANGE");
} else {
Serial.print(distance);
Serial.println(" cm");
}
if (distance <= 60) {
// 60cm = 2ft
digitalWrite(medThreat, LOW);
digitalWrite(noThreat, LOW);
digitalWrite(highThreat, HIGH);
} else if ((distance > 0) && (distance <= 152)) {
// 152cm = 5ft
digitalWrite(highThreat, LOW);
digitalWrite(noThreat, LOW);
digitalWrite(medThreat, HIGH);
} else if (distance > 152) {
// 152cm = 5ft
digitalWrite(highThreat, LOW);
digitalWrite(medThreat, LOW);
digitalWrite(noThreat, HIGH);
}
delay(500);
}