Change sensor value via serial monitor

Projects Programming
1

Hi everyone! I'm still a beginner with Arduino and I'm trying to understand how to change the value read by a sensor via serial monitor.

I am attaching a piece of the example sketch


void handleLight() {
  
  light =analogRead(LDR_PIN);
  Serial.println(light);
  pixels.begin();
  lcd.init();
  lcd.backlight();
  
    if (light < 700) { 
      
      for(int i=0;i<NUMPIXELS;i++)
         pixels.setPixelColor(i, pixels.Color(0,255,0)); 
         pixels.show();
         lcd.clear();
         lcd.setCursor(0,0);
         lcd.print("Light OK");
         delay (1000);
     
     }  else { for(int i=0;i<NUMPIXELS;i++)
      
          pixels.setPixelColor(i, pixels.Color(255,0,0)); 
          pixels.show();
          lcd.clear();
          lcd.setCursor(0,0);
          lcd.print("Light OFF");
          delay (1000);
}
}

I would like to be able to change the value (700) via serial monitor.

2

I would suggest to study Serial Input Basics to handle this

3

Step 1: Replace '700' with a variable. For example, a global variable named 'Threshold':
int Threshold = 700; // Default threshold

Step 2: Get input from Serial Monitor. Probably in loop().

  if (Serial.available())
  {
    int value = Serial.parseInt();
    // Zero means timeout so ignore that value
    if (value > 0 && value <= 1024)
      Threshold = value;
  }
4

Thanks so much! A question however, reading the guide called "Serial Input Basics" I saw that in example 4 they use the atoi command to convert the value from numeric to ascii (again if I understand correctly).

Don't I have to enter it?

5

No, atoi converts from ASCII to int

6

Serial.parseInt() will do that for you

7

ah ok, thank you

8

Thanks!

9

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