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 8333 hw_timer_t *gateTimer = NULL; //timer 1Mhz resolution int 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 callback timerAlarm(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 Definitions const int zero_cross_pin_ip2 = 2; // Input from zero-crossing detector const 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 handler volatile 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 setup void 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 cycle digitalWrite(mosfet_op9, HIGH); // Keep MOSFET ON for the remaining cycle delayMicroseconds(AC_half_cycle - delayTime); // Turn MOSFET OFF at the end of the half-cycle digitalWrite(mosfet_op9, LOW); } // Optionally, update dimming level from Serial input for dynamic control char 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 Serial hw_timer_t *gateTimer = NULL; int dimmerLevel = 0; #define GATE 45 #define SCALEFACTOR 32 // ((80 MHZ / 80 prescale) / 120 hz) / 256 #define ZERO_CROSS_PIN 46 void 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 DEBUG Serial.begin(115200); while (!Serial){} #endif pinMode(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