hello
i want control a fade of bulb as a Led
my components that I have got buy :
MOC3021
BT136
( condensator 100nf 400v)
( resistor 120R 1w)
and other resistors 1/4w
I think it is a problem of zero crossing
thank
You can use circuit like this for zero-crossing detector, the diode D1 need to change to 1N4007
Arduino controlled light dimmer
/*
AC Voltage dimmer with Zero cross detection
Author: Charith Fernanado <a href="http://www.inmojo.com"> http://www.inmojo.com
</a>
Adapted by DIY_bloke
License: Creative Commons Attribution Share-Alike 3.0 License.
Attach the Zero cross pin of the module to Arduino External Interrupt pin
Select the correct Interrupt # from the below table
(the Pin numbers are digital pins, NOT physical pins:
digital pin 2 [INT0]=physical pin 4 and digital pin 3 [INT1]= physical pin 5)
check: <a href="http://arduino.cc/en/Reference/attachInterrupt"> http://www.inmojo.com
</a>
Pin | Interrrupt # | Arduino Platform
---------------------------------------
2 | 0 | All -But it is INT1 on the Leonardo
3 | 1 | All -But it is INT0 on the Leonardo
18 | 5 | Arduino Mega Only
19 | 4 | Arduino Mega Only
20 | 3 | Arduino Mega Only
21 | 2 | Arduino Mega Only
0 | 0 | Leonardo
1 | 3 | Leonardo
7 | 4 | Leonardo
The Arduino Due has no standard interrupt pins as an iterrupt can be attached to almosty any pin.
In the program pin 2 is chosen
*/
int AC_LOAD = 3; // Output to Opto Triac pin
int dimming = 128; // Dimming level (0-128) 0 = ON, 128 = OFF
void setup()
{
pinMode(AC_LOAD, OUTPUT);// Set AC Load pin as output
attachInterrupt(0, zero_crosss_int, RISING); // Choose the zero cross interrupt # from the table above
}
//the interrupt function must take no parameters and return nothing
void zero_crosss_int() //function to be fired at the zero crossing to dim the light
{
// Firing angle calculation : 1 full 50Hz wave =1/50=20ms
// Every zerocrossing thus: (50Hz)-> 10ms (1/2 Cycle)
// For 60Hz => 8.33ms (10.000/120)
// 10ms=10000us
// (10000us - 10us) / 128 = 75 (Approx) For 60Hz =>65
int dimtime = (75*dimming); // For 60Hz =>65
delayMicroseconds(dimtime); // Wait till firing the TRIAC
digitalWrite(AC_LOAD, HIGH); // Fire the TRIAC
delayMicroseconds(10); // triac On propogation delay
// (for 60Hz use 8.33) Some Triacs need a longer period
digitalWrite(AC_LOAD, LOW); // No longer trigger the TRIAC (the next zero crossing will swith it off) TRIAC
}
void loop() {
for (int i=5; i <= 128; i++){
dimming=i;
delay(10);
}
}
this better way to control AC voltage devices"as a switch on - off or as a dimmer " using (SUGAR device)
and you can see many tutorials on it here
http://www.instructables.com/member/Sugar%20Device/?publicView=true