MOSFET Trailing Edge AC LED Light Dimmer - Precise Dimming Control for Incandescent and DIMMABLE LED Bulbs - Compatible with Arduino, Raspberry Pi, ESP8266, ESP32, Flicker-Free, High Power

Works well and can implement any dimmer waveform. Excellent service, would buy from this vendor again.Here is a version of the script for the ESP32-S3 using the latest timer API (that was changed in a way that breaks the existing timer based scripts)#define GATE 5#define ZERO_CROSS_PIN 4#define FREQ 8333hw_timer_t *gateTimer = NULL; //timer 1Mhz resolutionint dimmerLevel = 0;int timerActive = 0;long counter = 0;long counter2 = 0;long start = 0;long end = 0;void ARDUINO_ISR_ATTR ZeroCrossISR(){if (dimmerLevel > 0 && timerActive == 0) {digitalWrite(GATE, HIGH);timerAttachInterrupt(gateTimer, &TimerISR); //attach callbacktimerAlarm(gateTimer, ((FREQ * dimmerLevel) / 4096), true, 0);timerWrite(gateTimer, 0);//timerRestart(gateTimer);timerStart(gateTimer);timerActive = 1;counter++;//start = micros();}else digitalWrite(GATE, LOW);delayMicroseconds(100); // debounce zero-crossing}}void ARDUINO_ISR_ATTR TimerISR(){digitalWrite(GATE, LOW );//end = micros();timerStop(gateTimer);timerActive = 0;counter2++;}void setup(){Serial.begin(9600);while (!Serial){}pinMode(ZERO_CROSS_PIN,INPUT_PULLUP);pinMode(GATE,OUTPUT);digitalWrite(GATE, LOW);attachInterrupt(ZERO_CROSS_PIN, &ZeroCrossISR, FALLING);gateTimer = timerBegin(1000000);timerAttachInterrupt(gateTimer, &TimerISR);}void loop(){/*Serial.print("Still running... ");Serial.print(counter);Serial.print(", ");Serial.print(counter2);Serial.print(" Microsecs = ");Serial.println(end - start);*/dimmerLevel = 0;for (int i = 0; i < 4096; i += 50) {dimmerLevel = i;}for (int i = 4090; i >= 0; i -= 50) {dimmerLevel = i;}delay(5000);}

The code offered will not compile! Customer Service??? Non existent. I developed this code that works as of 10/11/24 Good Luck!// Pin Definitionsconst int zero_cross_pin_ip2 = 2; // Input from zero-crossing detectorconst int mosfet_op9 = 9; // MOSFET gate control (PWM output)int dimming_level = 255; // Dimming level (0-255), adjust for brightness// Time per half cycle for 50Hz = 10000 microseconds (10ms), for 60Hz = 8333 microseconds (8.33ms)int AC_half_cycle = 72000; // Adjust for 50Hz or 60Hz AC - 72000 works best for my application// Zero crossing interrupt handlervolatile bool zeroCrossDetected = false;void zeroCrossISR() {zeroCrossDetected = true;}void setup() {pinMode(mosfet_op9, OUTPUT);pinMode(zero_cross_pin_ip2, INPUT);// Attach interrupt to zero-crossing pin (RISING signal)attachInterrupt(digitalPinToInterrupt(zero_cross_pin_ip2), zeroCrossISR, RISING);Serial.begin(9600);delay(234);Serial.println("dimmer_AI2");delay(234);} // end setupvoid loop() {if (zeroCrossDetected) {zeroCrossDetected = false;// Map dimming level (0-255) to time delay (0-AC_half_cycle)int delayTime = map(dimming_level, 0, 255, AC_half_cycle, 0);// Wait for the delay time (to control phase cut)delayMicroseconds(delayTime);// After the delay, turn the MOSFET ON to allow current to pass for the rest of the cycledigitalWrite(mosfet_op9, HIGH);// Keep MOSFET ON for the remaining cycledelayMicroseconds(AC_half_cycle - delayTime);// Turn MOSFET OFF at the end of the half-cycledigitalWrite(mosfet_op9, LOW);}// Optionally, update dimming level from Serial input for dynamic controlchar i_read = 'x';int enter = 0x0A;int got_serial = false;char heres_what_i_read = ']';if (Serial.available() > 0) {i_read = (Serial.read());if (i_read != enter) {heres_what_i_read = i_read;}if (heres_what_i_read == 'd') {dimming_level = dimming_level - 10;Serial.print("dimming_level "); Serial.println(dimming_level);}if (heres_what_i_read == 'u') {dimming_level = dimming_level + 5;Serial.print("dimming_level "); Serial.println(dimming_level);}}} // end loop

Preformed as intended and easily turned in to a tester with additional parts. It just Works

This board worked perfectly for my project of building a wireless DMX controlled dimmer. Here is the included demo code re-written for use with ESP-32:#include <Arduino.h>#define DEBUG true //set to true for debug output, false for no debug output#define DS if(DEBUG)Serial // DS = Debug Serialhw_timer_t *gateTimer = NULL;int dimmerLevel = 0;#define GATE 45#define SCALEFACTOR 32 // ((80 MHZ / 80 prescale) / 120 hz) / 256#define ZERO_CROSS_PIN 46void IRAM_ATTR Zero_Cross_Interrupt(){if (dimmerLevel > 0){digitalWrite(GATE, HIGH);timerAlarmWrite(gateTimer, SCALEFACTOR*dimmerLevel, true);timerAlarmEnable( gateTimer);timerWrite( gateTimer, 0);timerStart( gateTimer);}else{digitalWrite(GATE, LOW);}delayMicroseconds(400); // debounce zero-crossing}void IRAM_ATTR onGateTimer(){digitalWrite(GATE, LOW );timerStop( gateTimer);}//***************************************************************************void setup(){#if DEBUGSerial.begin(115200);while (!Serial){}#endifpinMode(ZERO_CROSS_PIN,INPUT_PULLUP);pinMode(GATE,OUTPUT);digitalWrite( GATE, LOW);attachInterrupt(ZERO_CROSS_PIN, Zero_Cross_Interrupt, FALLING);gateTimer = timerBegin(0, 80, true);timerAttachInterrupt(gateTimer, &onGateTimer, true);timerAlarmWrite(gateTimer, 4000, true);}void loop(){dimmerLevel = 0;for (int i=0;i<250;i++){dimmerLevel++;delay(100);}for (int i=250;i>0;i--){dimmerLevel--;delay(100);}}

Great product. Very simple to use so long as you understand how to do leading and trailing edge algorithms.Clean design - worked first time. Great results and the MOSFETs hardly get warm when driving 10 LED lamps.Will be using this board for all my future LED lighting control