3 pcs Genuine PWM Ac Programmable Light Dimmer 110V - 220V AC Module Controller Compatible 50/60hz 3.3V/5V Logic Compatible with Arduino, STM, ARM, Raspberry

Good product good quality.

UPDATE: After a lot of investigation by a number of people, it appears these dimmers only really function properly in a range between about 25% and 80%. Below 25% and above 80% the module's circuitry introduces so much noise in the signal that the module does not function. So if working solely inside that range is okay for your purpose, you're fine with this. Otherwise, you're going to need to figure out another solution. Original review below: I bought three of these dimmers. They are advertised as RobotDyn dimmers and have that logo on the board, but the website is listed as RBDimmer, which isn't clear to be the same company (?). In any event, I have one of these 8A dimmers that I'm using with an Arduino Nano clone board (ATMega328p with a CH340g USB-serial chip). I have a sketch running to gradually brighten a tungsten/incandescent bulb (not an LED, which I know can cause problems), and it is exhibiting weird behavior: From 1% to 13% power, the bulb is lit at a constant brightness of about 60% (the brightness does not change between 1% and 14% power). Then from 14% to 16% power, the bulb flickers at a high frequency (maybe 50 Hz or so). Then from 16% to 17% power, the bulb turns on and off at a much lower frequency (maybe 5 Hz). Again, this is a tungsten/incandescent bulb I'm using, not an LED. It is also behaving weirdly above that (at 100% power it is not lighting LED bulbs at all), but I have a harder time deciphering that behavior. The code I am running is pasted below. The code looks clean. I have posted the code on the RBDimmer forum. If the seller (or anyone else) can point out a flaw in the code that could be causing the misbehavior of the dimmer, I will update this review. #include <RBDdimmer.h> // RobotDyn AC Dimmer library #define AC_LOAD 3 // DIM/PWM pin connected to the RobotDyn module #define ZC_PIN 2 // Zero-cross pin from the RobotDyn module (wired to D2, but handled internally) // Create dimmer object (older library: only takes 1 argument) dimmerLamp dimmer(AC_LOAD); void setup() { Serial.begin(9600); // Initialize dimmer (older library handles ZC internally) dimmer.begin(NORMAL_MODE, OFF); dimmer.setPower(0); Serial.println("Starting 30-minute gradual brightening..."); } void loop() { const int startBrightness = 0; // Start at 18% because below 18% it flickers. const int endBrightness = 100; // End at 100% const unsigned long totalTime = 1UL * 30UL * 1000UL; // calculating total time in milliseconds of fadeup; minutes, seconds per minute, milliseconds per second const int steps = 100; // 1% increments unsigned long delayPerStep = totalTime / steps; // calculating milliseconds per step // Gradually brighten for (int brightness = startBrightness; brightness <= endBrightness; brightness++) { dimmer.setState(ON); dimmer.setPower(brightness); // Set brightness (0–100%) Serial.print("Brightness: "); Serial.print(brightness); Serial.println("%"); delay(delayPerStep); } // Hold full brightness indefinitely Serial.println("Reached full brightness. Holding..."); dimmer.setPower(100); dimmer.setState(ON); while (true) { delay(1000); // keep AC dimmer timing active } }

UPdate- Hardware is good got it working without using any libraries that are thought to work. I will be digging into the library that the manufacture suggests and hopefully understand why it wont compile on my rig. I connect to a nano, UNO, a Mega, and ESP8266 and work. I did boost the rating to 4 stars but frustration with finding a working library pinged it. Especially when I can find other devices with working examples right out of the box on an UNO with no fiddling. When I find a piece of hardware I do not want to go backwards to reverse code/engineer I need to but the hardware to place into the project to move forward. This is a two year old project I needed to wrap up and I thought this would be the final piece for proof of concept. Hardware is good and does what is expected to. I will be using this hardware to move my project forward. -d² Frustrating to find examples. The ones in GitHub and library do not compile for the UNO as stated. Finding online threads has been cyclic and last thread was not resolved and a year old. Libraries show activity a year ago as well. Several dead links on site. This device would have solved a lot of issues that I have had with a product but now I have to go backwards to make this item work. the .ino examples did not work for me on an UNO but I cannot even get their out of the box examples to compile. Device as hardware looks solid, circuit diagram on line is good and usable. Just wish code would have worked. Will have to dig deeper than I wanted to in this product to make it work. Uses interrupts and PWM to achieve dimming of AC lighting. -d²