Created
September 19, 2017 16:27
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int led = 11, trigPin = 9, echoPin = 8; | |
long prevDuration = 300, realDuration, normalizedDuration; | |
long durationMin = 300, durationMax = 2400; | |
int prevBrightness; | |
void setup() { | |
pinMode(led, OUTPUT); | |
pinMode(trigPin, OUTPUT); | |
pinMode(echoPin, INPUT); | |
Serial.begin(9600); | |
} | |
void loop() { | |
prevDuration = realDuration; | |
digitalWrite(trigPin, LOW); | |
delayMicroseconds(2); | |
digitalWrite(trigPin, HIGH); | |
delayMicroseconds(10); | |
digitalWrite(trigPin, LOW); | |
realDuration = pulseIn(echoPin, HIGH); | |
normalizedDuration = constrain(realDuration, durationMin, durationMax); | |
Serial.print(realDuration); | |
Serial.print(", "); | |
Serial.print(normalizedDuration); | |
Serial.print(", "); | |
long durationDiff = abs(realDuration - prevDuration); | |
Serial.print(durationDiff); | |
Serial.print("\n"); | |
if (durationDiff > 50 && durationDiff < 10000) { | |
int brightness = map(normalizedDuration, durationMin, durationMax, 255, 0); | |
fadeTo(led, brightness); | |
} | |
delay(500); | |
} | |
void fadeTo(int pin, int brightness) { | |
if (brightness == prevBrightness) { return; } | |
int d = 5; | |
if (brightness > prevBrightness) { | |
for (int i = prevBrightness; i <= brightness; i++) { | |
analogWrite(pin, i); | |
delay(d); | |
} | |
} else { | |
for (int i = prevBrightness; i >= brightness; i--) { | |
analogWrite(pin, i); | |
delay(d); | |
} | |
} | |
prevBrightness = brightness; | |
} |
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