IDeATe

Outcome

1) code
2) screen shot of feedback of variables
3) video of led reaction to alert homeowner of burglars
4) photo of circuit

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// Define the Pin the Temperature sensor is on
int tempPin = A0;

// Define a pin that we'll place the FSR on
// Remember to add a 10K ohm pull-down resistor too
int fsrPin = A2;

// Create a variable to hold the FSR reading
int fsrReading = 0;

// Define a pin we'll place an LED on
int ledPin = D0;

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


// Create a variable that will store the temperature value
double temperature = 0.0;
double temperatureF = 0.0;

void setup()
{
  // Register a Spark variable here
  Spark.variable("temperature", &temperature, DOUBLE);
  Spark.variable("temperatureF", &temperatureF, DOUBLE);

  // Connect the temperature sensor to A0 and configure it
  // to be the input
  pinMode(tempPin, INPUT);

  // Setup the LED for output
  pinMode(ledPin, OUTPUT);

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

void loop()
{
  // Keep reading the sensor value so when we make an API
  // call to read its value, we have the latest one
  int reading = analogRead(tempPin);

  // The returned value from the Core is going to be in the range from 0 to 4095
  // Calculate the voltage from the sensor reading
  double voltage = (reading * 3.3 / 4095.0);

  // Calculate the temperature and update our static variable
  temperature = (voltage - 0.5) * 100;

  // Now convert to Farenheight
  temperatureF = ((temperature * 9.0) / 5.0) + 32.0;

  // Use analogRead to read the photo cell reading
  // This gives us a value from 0 to 4095
  fsrReading = analogRead(fsrPin);

  // Map this value into the PWM range (0-255)
  // and store as the led brightness
  ledBrightness = map(fsrReading, 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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Creative Project 1 from Caitlin on Vimeo.

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