Simple question my serial print doesnt work and i do not know why. its on the bottom.
//source: http://www.instructables.com/id/Arduino-controlled-light-dimmer-The-circuit/?lang=pt&ALLSTEPS
//Arduino controlled light dimmer: The software III
//The code below has been confirmed to work on the Leonardo
/*
AC Light Control
Updated by Robert Twomey
Changed zero-crossing detection to look for RISING edge rather
than falling. (originally it was only chopping the negative half
of the AC wave form).
Also changed the dim_check() to turn on the Triac, leaving it on
until the zero_cross_detect() turn's it off.
Adapted from sketch by Ryan McLaughlin
<a href="http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1230333861/30" rel="nofollow"> <a rel="nofollow"> http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1...</a>>
(now here: <a rel="nofollow"> http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1...</a>
*/
#include <TimerOne.h>
volatile int i=0; // Variable to use as a counter
volatile boolean zero_cross=0; // Boolean to store a "switch" to tell us if we have crossed zero
int AC_pin = 11; // Output to Opto Triac
int dim = 0; // Dimming level (0-128) 0 = on, 128 = 0ff
int inc=1; // counting up or down, 1=up, -1=down
int freqStep = 75; // This is the delay-per-brightness step in microseconds.
// For 60 Hz it should be 65
// It is calculated based on the frequency of your voltage supply (50Hz or 60Hz)
// and the number of brightness steps you want.
//
// Realize that there are 2 zerocrossing per cycle. This means
// zero crossing happens at 120Hz for a 60Hz supply or 100Hz for a 50Hz supply.
// To calculate freqStep divide the length of one full half-wave of the power
// cycle (in microseconds) by the number of brightness steps.
//
// (120 Hz=8333uS) / 128 brightness steps = 65 uS / brightness step
// (100Hz=10000uS) / 128 steps = 75uS/step
void setup() { // Begin setup
pinMode(AC_pin, OUTPUT); // Set the Triac pin as output
attachInterrupt(0, zero_cross_detect, RISING); // Attach an Interupt to Pin 2 (interupt 0) for Zero Cross Detection
Timer1.initialize(freqStep); // Initialize TimerOne library for the freq we need
Timer1.attachInterrupt(dim_check, freqStep);
// Use the TimerOne Library to attach an interrupt
// to the function we use to check to see if it is
// the right time to fire the triac. This function
// will now run every freqStep in microseconds.
}
void zero_cross_detect() {
zero_cross = true; // set the boolean to true to tell our dimming function that a zero cross has occured
i=0;
digitalWrite(AC_pin, LOW); // turn off TRIAC (and AC)
}
// Turn on the TRIAC at the appropriate time
void dim_check() {
if(zero_cross == true) {
if(i>=dim) {
digitalWrite(AC_pin, HIGH); // turn on light
i=0; // reset time step counter
zero_cross = false; //reset zero cross detection
}
else {
i++; // increment time step counter
}
}
}
void loop() {
dim=20;
delay(18);
Serial.println(dim);
}
"begin"