IDeATe

Outcome

Move up Delete Move down

Outcome

Move up Delete Move down

Process

The process of creating the circuit and the coding was pretty straightforward. I followed the code in the DiOT labs website to help set up the code. Initially, I used the wrong resistor and the response of the LED was better. When I switched out to use a resistor with a higher resistance, then the response of the LED was dimmer which makes sense since the resistance in the circuit increased.

Move up Delete Move down

Reflection

This was my first time using a photoresistor. It was interesting to code based on the intensity of the light and it was good to see how sensors can be connected to IoT devices.

Move up Delete Move down

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Move up Delete Move down

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Move up Delete Move down

// Define a pin that we'll place the photo cell on
// Remember to add a 10K Ohm pull-down resistor too.
int photoCellPin = A0;

// Create a variable to hold the light reading
int photoCellReading = 0;

// Define a pin we'll place an LED on
int ledPin = D2;

// Create a variable to store the LED brightness.
int ledBrightness = 0;

void setup()
{
  // Set up the LED for output
  pinMode(ledPin, OUTPUT);


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

}

void loop()
{
  // Use analogRead to read the photo cell reading
  // This gives us a value from 0 to 4095
  photoCellReading = analogRead(photoCellPin);

  // Map this value into the PWM range (0-255)
  // and store as the led brightness
  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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Outcome

Outcome

Process

Reflection

This was my first time using a photoresistor. It was interesting to code based on the intensity of the light and it was good to see how sensors can be connected to IoT devices.

Attribution

Attribution

Attribution