• Dispenser de sapun automat cu senzor de proximitate si senzor de lichid
• Elimina ideea de a apasa manual pe stica pentru a elibera sapun lichid
• Poate elimina posibilitatea de a lua bacterii de pe o sticla non-igienica de sapun
• Elimina riscul de a lua bacterii si anunta cand nu mai este sapun in sticla print-un LED

• Arduino Mega - 1
• Servomotor SG90 - 2
• Senzor ultrasonic de proximitate HC-SR04 - 1
• Senzor nivel apa - 1
• L.E.D. - 1
• 330 Ohm Resistor - 1

• Arduino IDE
• Additional Library: Servo.h

#include <Servo.h>   
Servo servo1;
Servo servo2;   
int trigPin = 5;  
int echoPin = 6;   
int servo1Pin = 9;
int servo2Pin = 8;
int led= 10;
long duration, dist, average;   
long aver[3];   //array for average
int lowerThreshold = 420;
int upperThreshold = 520;
 
// Sensor pins
#define sensorPower 7
#define sensorPin A0
 
// Value for storing water level
int val = 0;
 
int redLED = 2;
 
int readSensor() {
  digitalWrite(sensorPower, HIGH);
  delay(10);
  val = analogRead(sensorPin);
  digitalWrite(sensorPower, LOW);
  return val;
}
 
void setup() {    
  Serial.begin(9600);
  servo1.attach(servo1Pin);
  servo2.attach(servo2Pin);  
  pinMode(trigPin, OUTPUT);  
  pinMode(echoPin, INPUT);  
  servo1.write(0);       //close cap on power on
  servo2.write(0);
  delay(100);
 
  Serial.begin(9600);
  pinMode(sensorPower, OUTPUT);
  digitalWrite(sensorPower, LOW);
 
  // Set LED pin as an OUTPUT
  pinMode(redLED, OUTPUT);
 
  // Initially turn off the LED
  digitalWrite(redLED, LOW);
} 
 
void measure() {  
 digitalWrite(10,HIGH);
digitalWrite(trigPin, LOW);
delayMicroseconds(5);
digitalWrite(trigPin, HIGH);
delayMicroseconds(15);
digitalWrite(trigPin, LOW);
pinMode(echoPin, INPUT);
duration = pulseIn(echoPin, HIGH);
dist = (duration/2) / 29.1; //obtain distance
}
void loop() { 
  for (int i=0;i<=2;i++) {   //average distance
  measure();            
   aver[i]=dist;          
  delay(10);            //delay between measurements
  }
 dist=(aver[0]+aver[1]+aver[2])/3;  
 
if ( dist<15 ) {
 
  delay(1);
 servo1.write(0);
 servo2.write(0);  
 delay(3000);     
 servo1.write(150);
 servo2.write(150);  
 delay(1000);
 
 
 
 
 int level = readSensor();
 
 if (level <= 50) {
   Serial.println("Water Level: Low");
    digitalWrite(redLED, HIGH);
  }
  else if (level > 50) {
    Serial.println("Water Level: High");
    digitalWrite(redLED, LOW);
 
  }
  delay(1000);
}
 
}