PWM AC Voltage Dimmer 50/60Hz 80-240VAC for Arduino Raspberry Leading Edge Dimmer for AC Motor Pump Fan Light Heater Max 500W Pro Engineered Onboard Snubber Circuit - Compatible Worldwide

I'm using this for some Halloween lighting effects. I'm replacing an older implementation that used a zero-crossing detection / phase-cutting approach which never matured beyond the breadboard and arduino. It worked pretty well but the program to control it is quite complicated and the entire breadboard setup is pretty fragile (i.e. more than once I've found something disconnected and it was a lot of brain power to get things back to working).This PWM control is SO much simpler. It lends itself really well to intuitive design of the arduino program. Bonus: the entire thing is manufactured on a nice PCB form factor (no more loose parts).

Simple to use, careful safe PCB design, and so far rock solid. Dims light bulb loads smoothly using an asynchronous pwm signal (no need for zero cross detection and direct triac control). I'm using this module to control a 30 watt load of small light bulbs inside my rain gauge. The heat from the bulbs is used to melt snow when the rain gauge would otherwise just get piled up with snow. This little module works great controlled from the PWM output of a raspberrypi. The PCB construction is solid and clean. The high voltage connections are on the opposite side of the PCB from the low voltage connections making it easier to construct a safe project. This is a great product for safe variable control of AC loads. Cheers!

The media could not be loaded. Always nice when you get a module that just works. No headaches. No configuring. Video speaks for itself. Works great.

These are awesome. No fooling around with zero-crossing signals and interrupts, just deliver a variable voltage (or equivalently a PWM signal, I have used both without issue) to the device and it handles the AC phase control internally.It holds up to its rated power, I have run these at over 500 watts for at least 10 minutes without issue (though a fan is advisable for longevity).Most impressively, it easily drove a particularly troublesome AC motor and delivered excellent speed control, where all other dimmer boards I've tried have failed to do so. The onboard snubber is a nice touch, so you don't need anything else in the circuit for inductive loads.The build quality is obvious; these are a quality product.I wasted so much time trying to troubleshoot other popular AC dimmers; even when they worked they were very finicky and prone to failure. Save yourself a headache and get this.

We retrofitted these units with a higher ampacity triac and attached them to a proper 100W CPU heatsink with fan to run high amperage loads. So far seems to be working great.

Starting with the sample Python code for the Raspberry Pi shown in the seller's video I had terrible flickering on an incandescent bulb. I contacted the seller and they were very responsive. I discovered that the sample code uses a library that does software timing which is not precise enough to avoid causing flicking with an incandescent bulb. Instead I used the pigpio library for Python and this board worked great!I just enabled pigpio with: sudo pigpiodHere is simple code to set bulb at 50% brightness on GPIO 13:# No copyright - you can freely use this code snippetimport pigpiodim():pi = pigpio.pi()pi.set_PWM_frequency(13, 1000)pi.set_PWM_PWM(13, 127) # 0-255 range so 127 is about 50%if __main__ == '__main__':dim()

Pretty straight forward, On the low voltage side you have your 5v/3.3v, ground, and PWM signal inputs, on the high voltage side you have an AC input and AC load, both with their respective lables (Live and Neutral). You connect everything to its respective input and THEN you turn your AC circuit on (safety first kids!!). As soon as the board detects a DC circuit (your GPIO pins are correctly connected) all frequency leds will start blinking, so long as the AC current is off. Once your AC circuit is closed and correctly connected, you will see how the board detects the correct frequency of your high voltage AC circuit, and only one LED will be on indicating the grid's frequency.... or the closest thing to it I suppose. After everything is set and ready, you should see no blinking, either 50Hz in Europe or 60 Hz in America, or whatever your country uses (you know the drill....). Then you just need to know some coding and give wings to that little nerd inside your heart!I specifically use this to power an AC motor and control the RPM digitally from my Raspberry Pi, you can see how they do something similar with a drill in the youtube on the description.In summary, 5 stars, I think the board is perfectly sized (it's even smaller than my RPi3), doesn't require a lot of knowledge or thinking just some basic electronics and coding, and in case you don't know this already... BE SAFE! You will be dealing with High Voltage AC.

Great unit! works as advertised! Takes a PWM signal as input to modulate an AC load. Detects the presence of AC signal. Really nice to work with, easy to wire using the excellent instructions. Opto-isolation between low- and high-voltage sides which makes it really great.