Scale Analog input for switching

Keyi

Hi all, I have a question that is it possible to using the analog input value to choose switching statements? There is an simple arduino example and I wander does the map() function in Bela does similar stuff?

  // map the sensor range to a range of four options:
  int range = map(sensorReading, sensorMin, sensorMax, 0, 3);

  // do something different depending on the range value:
  switch (range) {
    case 0:  // your hand is on the sensor
      Serial.println("dark");
      break;
    case 1:  // your hand is close to the sensor
      Serial.println("dim");
      break;
    case 2:  // your hand is a few inches from the sensor
      Serial.println("medium");
      break;
    case 3:  // your hand is nowhere near the sensor
      Serial.println("bright");
      break;
  }```

giuliomoro

the map() function on Bela behaves the same as the one in Arduino (except that it operates on floats instead of integers).

Keyi

giuliomoro Hi Giulio, thank you very much for the reply. Then I guess I can only use if statement(since it won't return integers for switch statements)?

giuliomoro

the return value of map() above is stored in an integer, so it is not a floating point value. However, currently it will only reach 3 when the sensor is at sensorMax(or more). If you want the range to be more evenly spaced across the four values, then use map(sensorReading, sensorMin, sensorMax, 0, 3.999); and the switch() statement will work as expected. Also, you may want to add a sensorReading = clip(sensorReading, sensorMin, sensorMax) before the map() call, to make sure the output of map() is within the expected range.