School cafeteria's trash can upgrade project Lv.1

int trigPin = 9;

 

 

 

int echoPin = 8;

 

 

 

int led = 7;

 

int led2 = 6;

 

int led3 = 5;

 

int led4 = 4;

 

long distance;

 

 

 

long duration;

 

 

 

 

 

 

 

void setup() {

 

 

 

Serial.begin(9600);

 

 

 

pinMode(trigPin, OUTPUT);

 

 

 

pinMode(echoPin, INPUT);

 

pinMode (led,OUTPUT);

 

pinMode (led2,OUTPUT);

 

pinMode (led3,OUTPUT);

 

pinMode (led4,OUTPUT);

 

 

 

 

 

}

 

void loop() {

 

 

 

  ultra();

 

  // put your main code here, to run repeatedly:

 

 

 

Serial.println(distance);

 

 

 

 

 

 

 

if (distance<=5){

 

 digitalWrite(led,HIGH);

 

  digitalWrite(led2,HIGH);

 

  digitalWrite(led3,HIGH);

 

  digitalWrite(led4,HIGH);

delay(100);

}

 

 

 

 if (distance<=12){

 

 digitalWrite(led,HIGH);

 

  digitalWrite(led2,HIGH);

 

  digitalWrite(led3,HIGH);

 

  digitalWrite(led4,LOW);

delay(10);

}

 

if (distance<=21){

 

 digitalWrite(led,HIGH);

 

  digitalWrite(led2,HIGH);

 

  digitalWrite(led3,LOW);

 

  digitalWrite(led4,LOW);

delay(10);

}

 

if (distance<=30){

 

 digitalWrite(led,HIGH);

 

  digitalWrite(led2,LOW);

 

  digitalWrite(led3,LOW);

 

  digitalWrite(led4,LOW);

  

delay(10);

}

 

if (distance<=35){
 digitalWrite(led,LOW);
  digitalWrite(led2,LOW);
  digitalWrite(led3,LOW);
  digitalWrite(led4,LOW);

delay(100);

}

 

else {digitalWrite(led,LOW);
 digitalWrite(led2,LOW);
  digitalWrite(led3,LOW);
   digitalWrite(led4,LOW);
}
}

 

 



void ultra(){
// Clears the trigPin
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
// 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;
}