You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
61 lines
1.3 KiB
61 lines
1.3 KiB
/*
|
|
* Athors: Oulis Evnagelos, Oulis Nikolaos, Katsibras Drosos
|
|
* Ultrasonic Sensor HC-SR04 and Arduino
|
|
*
|
|
*/
|
|
|
|
// defines pins numbers
|
|
const int trigPin = 9;
|
|
const int echoPin = 10;
|
|
const int response = 6;
|
|
const int response1 = 5;
|
|
const int id = 2;
|
|
|
|
// defines variables
|
|
long duration;
|
|
int distance;
|
|
|
|
void setup() {
|
|
pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
|
|
pinMode(response, OUTPUT);
|
|
pinMode(response1, OUTPUT);
|
|
pinMode(echoPin, INPUT); // Sets the echoPin as an Input
|
|
Serial.begin(9600); // Starts the serial communication
|
|
|
|
// Clears the trigPin
|
|
digitalWrite(trigPin, LOW);
|
|
delayMicroseconds(2);
|
|
}
|
|
|
|
void loop() {
|
|
// Sets the trigPin on HIGH state for 10 micro seconds
|
|
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;
|
|
|
|
// Prints the distance on the Serial Monitor
|
|
//Serial.print("Distance: ");
|
|
//Serial.println(distance);
|
|
|
|
String park_out;
|
|
if (distance < 4){
|
|
park_out = String(id) + "#0"; //parking isn't available.
|
|
digitalWrite(response, LOW);
|
|
digitalWrite(response1, HIGH);
|
|
}
|
|
else{
|
|
park_out = String(id) + "#1"; //parking is available.
|
|
digitalWrite(response, HIGH);
|
|
digitalWrite(response1, LOW);
|
|
}
|
|
|
|
Serial.println(park_out);
|
|
|
|
delay(500);
|
|
}
|
|
|