Commit fd8c7a5f authored by Brandon Fan's avatar Brandon Fan 💬
Browse files

add elevation change

parent c56a3d2f
#define echoPin 2 // attach pin D2 Arduino to pin Echo of HC-SR04
#define trigPin 3 //attach pin D3 Arduino to pin Trig of HC-SR04
// defines variables
long duration; // variable for the duration of sound wave travel
int distance; // variable for the distance measurement
int prevDistance;
void setup() {
pinMode(trigPin, OUTPUT); // Sets the trigPin as an OUTPUT
pinMode(echoPin, INPUT); // Sets the echoPin as an INPUT
Serial.begin(9600); // // Serial Communication is starting with 9600 of baudrate speed
Serial.println("Ultrasonic Sensor HC-SR04 Test"); // print some text in Serial Monitor
Serial.println("with Arduino UNO R3");
prevDistance = 0;
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
// Sets the trigPin HIGH (ACTIVE) for 10 microseconds
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
// Reads the echoPin, returns the sound wave travel time in microseconds
duration = pulseIn(echoPin, HIGH);
// Calculating the distance
distance = duration * 0.034 / 2; // Speed of sound wave divided by 2 (go and back)
}
void loop() {
// Clears the trigPin condition
digitalWrite(trigPin, LOW);
delayMicroseconds(100);
// Sets the trigPin HIGH (ACTIVE) for 10 microseconds
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
// Reads the echoPin, returns the sound wave travel time in microseconds
duration = pulseIn(echoPin, HIGH);
// Calculating the distance
distance = duration * 0.034 / 2; // Speed of sound wave divided by 2 (go and back)
// Displays the distance on the Serial Monitor
if (distance - prevDistance < 2000 && distance - prevDistance > -2000) {
if (distance - prevDistance > 40) {
Serial.print("Major Change in Elevation Down: ");
Serial.print(distance - prevDistance);
Serial.println("cm");
Serial.print("New Elevation: ");
Serial.print(distance);
Serial.println("cm");
Serial.println();
}
else if (distance - prevDistance < -40) {
Serial.print("Major Change in Elevation Up: ");
Serial.print(distance - prevDistance);
Serial.println("cm");
Serial.print("New Elevation: ");
Serial.print(distance);
Serial.println("cm");
Serial.println();
}
prevDistance = distance;
}
}
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