آموزش راه اندازی سنسور سطح آب با آردوینو – سنسور سطح آب و مایعات چیست و چگونه کار می کند؟

/* Water level sensor
 * by Ali Akbar
 * https://electropeak.com/learn/ 
 */
 
#define sensorPin A0 // define pin A0 as sensorPin 
#define vccPin 2 // define pin 2 as Vcc for sensor 

int sensorValue = 0; // Value for storing water level
const int redLED = 3;
const int yellowLED = 4;
const int greenLED = 5;
const int sensorMin = 0; // sensor minimum 
const int sensorMax = 700; // sensor maximum 

void setup() { 
 pinMode(vccPin, OUTPUT); // Set D2 as an OUTPUT
 digitalWrite(vccPin, LOW); // Set to LOW so no power flows through the sensor 
 pinMode(redLED, OUTPUT);
 pinMode(yellowLED, OUTPUT);
 pinMode(greenLED, OUTPUT);
 // Initially turn off all LEDs
 digitalWrite(redLED, LOW);
 digitalWrite(yellowLED, LOW);
 digitalWrite(greenLED, LOW);
}
 
void loop() {
 Serial.begin(9600);
 sensorValue = readSensor(); //
 int range = map(sensorValue, sensorMin, sensorMax, 0, 3); // 3 levels 
 switch (range) { 
 case 0: 
 digitalWrite(redLED, LOW);
 digitalWrite(yellowLED, LOW);
 digitalWrite(greenLED, HIGH); 
 Serial.println("green"); 
 break; 

 case 1: // Sensor getting wet 
 digitalWrite(redLED, LOW);
 digitalWrite(yellowLED, HIGH);
 digitalWrite(greenLED, LOW);
 Serial.println("y"); 
 break; 

 case 2: // 
 digitalWrite(redLED, HIGH);
 digitalWrite(yellowLED, LOW);
 digitalWrite(greenLED, LOW);
 Serial.println("R"); 
 break; 
 } 
 delay(2000); 
}

//This is a function used to get the reading
int readSensor() {
 digitalWrite(vccPin, HIGH); // Turn the sensor ON
 delay(10); // wait 10 milliseconds
 sensorValue = analogRead(sensorPin); // Read the analog value form sensor
 digitalWrite(vccPin, LOW); // Turn the sensor OFF
 return sensorValue; // send current reading
}