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add sensor examples and dir structure

main
rra 3 years ago
parent
commit
b7decb5002
  1. 13
      pointlights/pointlights.ino
  2. 63
      sensor_filtering/sensor_filtering.ino
  3. 48
      sensor_processing/sensor_processing.ino

13
pointlights.ino → 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 = 3; // how often we plot, every Nth time.
int plotFrequency = 2; // 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;
}

63
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;
}

48
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);
}
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