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prog/sine-pulsing-without-pwm.c

Created November 19, 2014 20:07
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Arduino LED sine wave pulsing without PWM
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sine-pulsing-without-pwm.c
#define LED 13
#define FRAME 20000ul // 20000us => 50Hz
#define PERIOD 1000000ul // 1s
void setup() {
pinMode(LED, OUTPUT);
}
void loop() {
unsigned long t;
float p, f, v;
t = micros();
f = (t % FRAME) / (float) FRAME;
p = (t % PERIOD) / (float) PERIOD;
v = (1.0 + sin(p * 2.0 * PI)) / 2.0;
digitalWrite(LED, v > f ? HIGH : LOW);
}
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prog commented Nov 19, 2014

http://youtu.be/EUwtL09cJ6s

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