IDeATe

Outcome

Working with Inputs & sensors explore the array of input sensors, with an LED to notify users how much sensors senses data: Photoresistor, Photoresistor Inversion, Filtering & Force sensor integration.

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Process

Process is divided into different experiments on processing photoresistor data as well as adding in force sensor to the mix.

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Using a Photoresistor

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Ex 1. Connecting a photoresistor, and mapping its data to LED brightness. (Bright environment = Bright LED)

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// Ex 1
int photoCellPin = A0;
int photoCellReading = 0;
int ledPin = D2;
int ledBrightness = 0;

void setup()
{
  pinMode(ledPin, OUTPUT);

  // Create a cloud variable of type integer called 'light' mapped to photoCellReading
  Particle.variable("light", &photoCellReading, INT);

}

void loop()
{
  // This gives us a value from 0 to 4095
  photoCellReading = analogRead(photoCellPin);

  // Map this value into the PWM range (0-255)
  ledBrightness = map(photoCellReading, 0, 4095, 0, 255);

  // fade the LED to the desired brightness
  analogWrite(ledPin, ledBrightness);

  // wait 1/10th of a second and then loop
  delay(100);
}

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Ex 1.1 Inverting Photoresistor value towards LED brightness. (Bright surrounding = Dim LED)

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// Ex 1.1

int photoCellPin = A0;
int photoCellReading = 0;
int ledPin = D2;
int ledBrightness = 0;

void setup()
{
  pinMode(ledPin, OUTPUT);

  // Create a cloud variable of type integer called 'light' mapped to photoCellReading
  Particle.variable("light", &photoCellReading, INT);

}

void loop()
{
  // This gives us a value from 0 to 4095
  photoCellReading = analogRead(photoCellPin);

  // Map this value into the inverted PWM range
  ledBrightness = map(photoCellReading, 0, 4095, 255, 0);

  // fade the LED to the desired brightness
  analogWrite(ledPin, ledBrightness);

  // wait 1/10th of a second and then loop
  delay(100);
}

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Ex 1.2 Filtering Photoresistor measurement to be either on or off LED.

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int photoCellPin = A0;
int photoCellReading = 0;
int ledPin = D2;
int ledBrightness = 0;

void setup()
{
  pinMode(ledPin, OUTPUT);

  // Create a cloud variable of type integer called 'light' mapped to photoCellReading
  Particle.variable("light", &photoCellReading, INT);

}

void loop()
{
  // This gives us a value from 0 to 4095
  photoCellReading = analogRead(photoCellPin);
  
  if (photoCellReading < 2000) {
      ledBrightness = 255;
  }
  else {
      ledBrightness = 0;
  }

  // fade the LED to the desired brightness
  analogWrite(ledPin, ledBrightness);

  // wait 1/10th of a second and then loop
  delay(100);
}

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Combining Sensors & Inputs

2 parts: Brief in getting the sensor data online (video 1) + integrating outputs with if statements (video 2).

These 2 sensors integration represents a proof-of-concept for an autonomous lighting being turned on, when the sun sets (dim environment) or when the user steps in the house (high force).

Following Conditions:

- Dim environment ONLY: Fast blink 5 times

- High Force ONLY: Medium blink 3 times

- Dim environment & high force: Long 1 blink

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int photoCellPin = A0;
int photoCellReading = 0;
int forcePin = A1;
int forceReading = 0;
int ledPin = D2;
int ledBrightness = 0;

void setup()
{
  pinMode(ledPin, OUTPUT);

  // Create a cloud variable of type integer called 'light' mapped to photoCellReading
  Particle.variable("light", &photoCellReading, INT);
  Particle.variable("force", &forceReading, INT);
}

void loop()
{
  // This gives us a value from 0 to 4095
  photoCellReading = analogRead(photoCellPin);
  forceReading = analogRead(forcePin);
  
  if (forceReading > 2000 && photoCellReading < 2000) {
      blink(1, 2000);
  }
  else if (forceReading > 2000 && photoCellReading > 2000) {
      blink(3, 500);
  }
  else if (forceReading < 2000 && photoCellReading < 2000) {
      blink(5, 200);
  }
  else {
      ledBrightness = 0;
  }
  
  // wait 1/10th of a second and then loop
  delay(100);
}

void blink(int times, int del) {
    for (int i=0; i < times; i++) {
        analogWrite(ledPin, 255);
        delay(del);
        analogWrite(ledPin, 0);
        delay(del);
    }
}

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