<< Arduino light organ (II)- The circuit

WARNING: In this part is used mains voltage, which can carry risks. If you do not have enough experience or not you think trained, best uses few leds low voltage and evitate a scare. The author is not responsible for any damage caused by not taking proper security measures.

For the power stage I used  triacs of type BT137 controlled by optocouplers MOC3041. Depending on the power you need to control, you can change the type of TRIAC less powerful one (or more ...).

The optocouplers MOC3041 internally contain a control circuit for triggering the zero crossing, the triac is always close to zero voltage pass avoiding interference.
You can use other types of optocouplers respecting the circuit recommended by the manufacturer.


The scheme:
Power stage for Arduino organ light


And this appearance when mounted (in my case the stage is 4 channels)

Power stage of Arduino light organ

Note that a box is mounted on suitably isolated. The heatsinks are Triacs for high continuous loads (in this case support 8A, allowing about 1500W per channel).

The result:


Have fun ....

8 comments

April 12, 2013 at 11:43 AM

hello i designed the same circuit but it is not working Bulb remains ON always even when i remove arduino from circuit

April 13, 2013 at 12:52 PM

@niteshjha
Check the connections. Check that the triacs are not shorted. Try removing the optocouplers...

January 28, 2014 at 8:00 PM

error while compilation.
sketch_jan29a.cpp.o: In function `loop':
C:\Documents and Settings\Administrator\Desktop\Arduino\arduino-1.0.5/sketch_jan29a.ino:87: undefined reference to `fix_fft(char*, char*, int, int)'

January 29, 2014 at 1:16 PM

@jaywardhan-pandit
Have you added the 'fix_fft' library?

April 20, 2015 at 6:53 AM

hola! no entiendo el diagrama por el PWM. tienes algo mas claro que explica como los resitors son conectados al BT137? No entiendo cual es el T1 o el T2 de los BT137 con la orientacion del esquema.

April 21, 2015 at 5:29 AM

gracias! is there nothing attached to the "gate" of the BT137? do you have a clearer scheme for this part of the circuit? it's a little confusing.

April 21, 2015 at 8:17 AM

@Kerem
Confusing?
Is the standard configuration shown in the datasheet optocoupler MOC3041.
https://www.fairchildsemi.com/datasheets/MO/MOC3041M.pdf

April 26, 2015 at 8:18 AM

hola arduino guay, lo que no entiendo es que en el "scheme" me has dicho que desde el BT126 debe tener una conexión al T1 después del retiro de 330 y el T2 dspues del 360. Pero, me parece que debemos cambiar el T1 por el T2 y viceversa. Es posible que tienes una foto mas detallada de la parte superior y el fondo del Power Stage?

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