add sensor examples and dir structure

pointlights/pointlights.ino

@@ -8,8 +8,7 @@ unsigned long currentMillis;
 int brightness = 0; // our main variable for setting the brightness of the LED
 float velocity = 1.0; // the speed at which we change the brightness.
 int ledPin = 9; // we use pin 9 for PWM
-int p = 0; // use to keep track how often we plot
+int plotFrequency = 2; // how often we plot, every Nth time.
-int plotFrequency = 3; // how often we plot, every Nth time.
 
 void setup() {
   // put your setup code here, to run once:
@@ -20,9 +19,9 @@ void setup() {
 void loop() {
   // put your main code here, to run repeatedly:
   compose();
-  delay(10);
   analogWrite(ledPin, brightness);
   currentMillis = millis(); //store the current time since the program started
+  delay(10);
 }
 
 void compose() {
@@ -38,7 +37,7 @@ void compose() {
     plot("INCREASING", brightness);
         
     if (brightness > 250){
-      //ledState = WAVE;
+      ledState = WAVE;
       changeState(WAVE);
       }
     break;
@@ -54,7 +53,7 @@ void compose() {
   case WAVE:
     plot("WAVE", brightness);
     
-    brightness = sinewave(1000,256,0); // you can tweak the parameters of the sinewave
+    brightness = sinewave(500,256,0); // you can tweak the parameters of the sinewave
     analogWrite(ledPin, brightness);
     
     if (currentMillis - startMillis >= 5000){ //change state after 5 secs by comparing the time elapsed since we last change state
@@ -105,6 +104,10 @@ int increase_brightness (int brightness, float velocity){
     return brightness = brightness + 1 * velocity;
   }
 
+int exponential_increase (int brightness, float velocity){
+    return brightness = 1 + brightness * velocity;
+}
+
 int decrease_brightness (int brightness, float velocity){
     return brightness = brightness - 1 * velocity;
   }

sensor_filtering/sensor_filtering.ino

@@ -0,0 +1,63 @@
+int brightness = 0; // our main variable for setting the brightness of the LED
+int ledPin = 9; // we use pin 9 for PWM
+int sensorPin = A5; 
+
+// smoothing
+const int numReadings = 10; // higher is smoother but less responsive
+
+int readings[numReadings];      // the readings from the analog input
+int readIndex = 0;              // the index of the current reading
+int total = 0;                  // the running total
+int average = 0;                // the average
+
+int ldr;
+
+void setup() {
+  // put your setup code here, to run once:
+  Serial.begin(9600);
+  pinMode(ledPin, OUTPUT);
+  pinMode(sensorPin, INPUT);
+
+ // set all readings to 0 on start
+ for (int thisReading = 0; thisReading < numReadings; thisReading++) {
+    readings[thisReading] = 0;
+  }
+}
+
+void loop() {
+  ldr = analogRead(sensorPin);
+  // brightness = ldr; // don't do this
+
+  //filtering jitteryness
+  int smoothed = smooth_sensor(ldr);
+  //Serial.println(smoothed);
+
+  //clamping the range
+  // n.b. the actual values, calibrate!
+  brightness = map(ldr, 0, 1023, 0, 255);
+  Serial.println(brightness);
+  
+  analogWrite(ledPin, brightness);
+  delay(1);
+}
+
+int smooth_sensor(int sensor_value) {
+    // subtract the last reading:
+  total = total - readings[readIndex];
+  // read from the sensor:
+  readings[readIndex] = sensor_value;
+  // add the reading to the total:
+  total = total + readings[readIndex];
+  // advance to the next position in the array:
+  readIndex = readIndex + 1;
+
+  // if we're at the end of the array...
+  if (readIndex >= numReadings) {
+    // ...wrap around to the beginning:
+    readIndex = 0;
+  }
+
+  // calculate the average:
+  average = total / numReadings;
+  return average;
+  }

sensor_processing/sensor_processing.ino

@@ -0,0 +1,48 @@
+float brightness = 0; // our main variable for setting the brightness of the LED
+const int ledPin = 9; // we use pin 9 for PWM
+const int sensorPin = 4; // we use pin D4 for the button
+
+int buttonState = 0;
+float counter = 0;
+// the ratio between counter increment and fade should be tweaked
+float counter_inc = 1.0; 
+float counter_fade = 0.99;
+int counter_threshold = 90;
+
+
+void setup() {
+  // put your setup code here, to run once:
+  Serial.begin(9600);
+  pinMode(ledPin, OUTPUT);
+  pinMode(sensorPin, INPUT);
+
+}
+
+void loop() {
+  buttonState = !digitalRead(sensorPin);
+  // digitalWrite(ledPin,buttonState); // don't do this
+  
+  Serial.println(counter);
+
+  // fading pattern that requires 'effort'
+  if (buttonState == HIGH) {
+    
+    counter += counter_inc;
+  } 
+  
+  counter = counter*counter_fade;
+ 
+  if (counter > counter_threshold){
+    brightness ++;
+    // here you could also switchCase(myCase)
+    }
+   else {
+    brightness = brightness * 0.99;
+   }
+
+  brightness = constrain(brightness, 0, 255);
+  
+  analogWrite(ledPin, brightness);
+  
+  delay(5);
+}