LED Breather

gistfile1.nut

// Pulse the LED
// Adapted from http://sean.voisen.org/blog/2011/10/breathing-led-with-arduino/ by Sean Voisen
function pulse_led(led) {
    imp.wakeup(0.05, function() {
        pulse_led(led);
    });
    
    // Work out the next PWM level
    local led_level = (math.exp(math.sin(hardware.millis()/2000.0*PI)) - 0.36787944) * 0.423529412;
    led.write(led_level);
}

led_red <- hardware.pin1;
led_red.configure(PWM_OUT, 1.0/400.0, 0.0);
led_red.write(0);
pulse_led(led_red);