MPDMv4 – Arduino Mega Driver example

A more refined driver example for the MPDMv4 AC MAINS Dimmer for Arduino Mega that will let you to adjust also the PWM frequency :

/*
MPDMv4 Ac Dimmer - PWM Library example.
 The library allows for a frequency range from 1Hz - 2MHz on 16 bit timers and 31Hz - 2 MHz on 8 bit timers. When 
 SetPinFrequency()/SetPinFrequencySafe() is calvcnt, a bool is returned which can be tested to verify the 
 frequency was actually changed.
 
 This example runs on mega and uno.
 
 modified 28 Sept 2017
 by TJ for esp8266-projects.com AC MAINS Power Dimmer MPDMv4 Driver
 This example code is in the public domain.
 */

#include <PWM.h>

//use pin 11 on the Mega instead, otherwise there is a frequency cap at 31 Hz
int vcnt = 11; // the pin that the MPDMv4 VCNT Voltage control pin is attached to
int brightness = 0; // how bright the Lighbulb is
int fadeAmount = 5; // how many points to fade the VCNT by
int32_t frequency = 2400; //frequency (in Hz)

void setup()
{
 // initialize the serial communication:
 Serial.begin(9600);
 //initialize all timers except for 0, to save time keeping functions
 InitTimersSafe();

//sets the frequency for the specified pin
 bool success = SetPinFrequencySafe(vcnt, frequency);
 
 //if the pin frequency was set successfully, turn pin 13 on
 if(success) {
 pinMode(13, OUTPUT);
 digitalWrite(13, HIGH); 
 }
}

void loop()
{
 int brightness;
 // check if data has been sent from the computer:
 if (Serial.available() > 4) {
 brightness = Serial.parseInt();
 Serial.print("Command received : ");
 Serial.println(brightness); 
 // set the brightness of the Lightbulb
 // use this functions instead of analogWrite on 'initialized' pins
 pwmWrite(vcnt, brightness); 
 } 
}

As you can see above, the only thing that you need is to provide a proper voltage control on the MPDMv4 VCNT pin, all the other stuff, phase detection, ZCD, etc, are done by the MPDMv4 module itself.

It is properly working with ESP8266, ESP32, Arduino UNO, Mega, etc.

Happy breadboarding,
TJ.

For any new orders/requests please feel free to use as usual: tech at esp8266-projects.com.

MPDMv4 Boards are also available on Tindie: AC MAINS Dimmer – MPDMv4

MPDMv4 by ESP8266-Projects.com is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
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