PWM control

[doodoovane]

Hello everyone,

The aim here is to control the speed of a 5v fan with PWM of an arduino nano.
I usualy do it with this code:

const byte OC1A_PIN = 9;
const byte OC1B_PIN = 10;

const word PWM_FREQ_HZ = 25000; //Adjust this value to adjust the frequency
const word TCNT1_TOP = 16000000/(2*PWM_FREQ_HZ);

byte in = 0;

void setup() {
  
  pinMode(OC1A_PIN, OUTPUT);
  Serial.begin(9600);
  Serial.println("Demarage du PWM"); // so I can keep track of what is loaded
 


  // Clear Timer1 control and count registers
  TCCR1A = 0;
  TCCR1B = 0;
  TCNT1  = 0;

  // Set Timer1 configuration
  // COM1A(1:0) = 0b10   (Output A clear rising/set falling)
  // COM1B(1:0) = 0b00   (Output B normal operation)
  // WGM(13:10) = 0b1010 (Phase correct PWM)
  // ICNC1      = 0b0    (Input capture noise canceler disabled)
  // ICES1      = 0b0    (Input capture edge select disabled)
  // CS(12:10)  = 0b001  (Input clock select = clock/1)
  
  TCCR1A |= (1 << COM1A1) | (1 << WGM11);
  TCCR1B |= (1 << WGM13) | (1 << CS10);
  ICR1 = TCNT1_TOP;
}

void loop() {
if (Serial.available()) {       // Check if there's data
    char buf[10];
    int in = Serial.readBytesUntil('\n', buf, sizeof buf - 1);
    buf[in]=0;
    in = atoi(buf);
    if (in > 100)
      in = 100;
    Serial.println(in);// Pass the value of "in" to the pin}
    setPwmDuty(in); //Change this value 0-100 to adjust duty cycle
}
}
void setPwmDuty(byte duty) {
  OCR1A = (word) (duty*TCNT1_TOP)/100;
}

Is it possible to do the same with mysensors?

The next step of this would be to connect the arduino via USB and control it using domoticz.

[Yveaux]

@Dovane-Benattar ofcourse! All the initialization and pwm setting code should be copied to the mysensors sketch, and the serial reading could be replaced by mysensors message handling.

[doodoovane]

Thanks Yveaux! I will give it a try like this

[doodoovane]

@Yveaux thank you for your answer!

/**
* The MySensors Arduino library handles the wireless radio link and protocol
* between your home built sensors/actuators and HA controller of choice.
* The sensors forms a self healing radio network with optional repeaters. Each
* repeater and gateway builds a routing tables in EEPROM which keeps track of the
* network topology allowing messages to be routed to nodes.
*
* Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
* Copyright (C) 2013-2018 Sensnology AB
* Full contributor list: https://github.com/mysensors/MySensors/graphs/contributors
*
* Documentation: http://www.mysensors.org
* Support Forum: http://forum.mysensors.org
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
*******************************
*
* DESCRIPTION
* The ArduinoGateway prints data received from sensors on the serial link.
* The gateway accepts input on serial which will be sent out on radio network.
*
* The GW code is designed for Arduino Nano 328p / 16MHz
*
* Wire connections (OPTIONAL):
* - Inclusion button should be connected between digital pin 3 and GND
* - RX/TX/ERR leds need to be connected between +5V (anode) and digital pin 6/5/4 with resistor 270-330R in a series
*
* LEDs (OPTIONAL):
* - To use the feature, uncomment any of the MY_DEFAULT_xx_LED_PINs
* - RX (green) - blink fast on radio message received. In inclusion mode will blink fast only on presentation received
* - TX (yellow) - blink fast on radio message transmitted. In inclusion mode will blink slowly
* - ERR (red) - fast blink on error during transmission error or receive crc error
*
*/

// Enable debug prints to serial monitor
#define MY_DEBUG


// Enable and select radio type attached
#define MY_RADIO_RF24
//#define MY_RADIO_NRF5_ESB
//#define MY_RADIO_RFM69
//#define MY_RADIO_RFM95

// Set LOW transmit power level as default, if you have an amplified NRF-module and
// power your radio separately with a good regulator you can turn up PA level.
#define MY_RF24_PA_LEVEL RF24_PA_LOW

// Enable serial gateway
#define MY_GATEWAY_SERIAL

// Define a lower baud rate for Arduinos running on 8 MHz (Arduino Pro Mini 3.3V & SenseBender)
#if F_CPU == 8000000L
#define MY_BAUD_RATE 38400
#endif

// Enable inclusion mode
#define MY_INCLUSION_MODE_FEATURE
// Enable Inclusion mode button on gateway
//#define MY_INCLUSION_BUTTON_FEATURE

// Inverses behavior of inclusion button (if using external pullup)
//#define MY_INCLUSION_BUTTON_EXTERNAL_PULLUP

// Set inclusion mode duration (in seconds)
#define MY_INCLUSION_MODE_DURATION 60
// Digital pin used for inclusion mode button
//#define MY_INCLUSION_MODE_BUTTON_PIN  3

// Set blinking period
#define MY_DEFAULT_LED_BLINK_PERIOD 300

// Inverses the behavior of leds
//#define MY_WITH_LEDS_BLINKING_INVERSE

// Flash leds on rx/tx/err
// Uncomment to override default HW configurations
//#define MY_DEFAULT_ERR_LED_PIN 4  // Error led pin
//#define MY_DEFAULT_RX_LED_PIN  6  // Receive led pin
//#define MY_DEFAULT_TX_LED_PIN  5  // the PCB, on board LED

#include <MySensors.h>

const byte OC1A_PIN = 9;
const byte OC1B_PIN = 10;

const word PWM_FREQ_HZ = 25000; //Adjust this value to adjust the frequency
const word TCNT1_TOP = 16000000/(2*PWM_FREQ_HZ);

byte in = 0;

void setup()
{
	// Setup locally attached sensors
 pinMode(OC1A_PIN, OUTPUT);
  Serial.begin(9600);
  Serial.print(0);
  


  // Clear Timer1 control and count registers
  TCCR1A = 0;
  TCCR1B = 0;
  TCNT1  = 0;

  // Set Timer1 configuration
  // COM1A(1:0) = 0b10   (Output A clear rising/set falling)
  // COM1B(1:0) = 0b00   (Output B normal operation)
  // WGM(13:10) = 0b1010 (Phase correct PWM)
  // ICNC1      = 0b0    (Input capture noise canceler disabled)
  // ICES1      = 0b0    (Input capture edge select disabled)
  // CS(12:10)  = 0b001  (Input clock select = clock/1)
  
  TCCR1A |= (1 << COM1A1) | (1 << WGM11);
  TCCR1B |= (1 << WGM13) | (1 << CS10);
  ICR1 = TCNT1_TOP;


}

void presentation()
{
	// Present locally attached sensors
}

void loop()
{
	// Send locally attached sensor data here
 if (Serial.available()) {       // Check if there's data
    char buf[10];
    int in = Serial.readBytesUntil('\n', buf, sizeof buf - 1);
    buf[in]=0;
    in = atoi(buf);
    if (in >= 100)
      in = 100;
    Serial.println(in);// Pass the value of "in" to the pin}
    setPwmDuty(in); //Change this value 0-100 to adjust duty cycle
}
}
void setPwmDuty(byte duty) {
  OCR1A = (word) (duty*TCNT1_TOP)/100;
}

Can you tell me if this could work? (I tried but it does not.. maybe I do something else wrong)

[doodoovane]

Some news, it works now!
I took some code for a dimmable LED here

The only problem now is that the fan does a little sound it didn't with the first code.

here is the code:

/**
* The MySensors Arduino library handles the wireless radio link and protocol
* between your home built sensors/actuators and HA controller of choice.
* The sensors forms a self healing radio network with optional repeaters. Each
* repeater and gateway builds a routing tables in EEPROM which keeps track of the
* network topology allowing messages to be routed to nodes.
*
* Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
* Copyright (C) 2013-2019 Sensnology AB
* Full contributor list: https://github.com/mysensors/MySensors/graphs/contributors
*
* Documentation: http://www.mysensors.org
* Support Forum: http://forum.mysensors.org
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
*******************************
*
* DESCRIPTION
* The ArduinoGateway prints data received from sensors on the serial link.
* The gateway accepts input on serial which will be sent out on radio network.
*
* The GW code is designed for Arduino Nano 328p / 16MHz
*
* Wire connections (OPTIONAL):
* - Inclusion button should be connected between digital pin 3 and GND
* - RX/TX/ERR leds need to be connected between +5V (anode) and digital pin 6/5/4 with resistor 270-330R in a series
*
* LEDs (OPTIONAL):
* - To use the feature, uncomment any of the MY_DEFAULT_xx_LED_PINs
* - RX (green) - blink fast on radio message received. In inclusion mode will blink fast only on presentation received
* - TX (yellow) - blink fast on radio message transmitted. In inclusion mode will blink slowly
* - ERR (red) - fast blink on error during transmission error or receive crc error
*
*/

// Enable debug prints to serial monitor
#define MY_DEBUG


// Enable and select radio type attached
//#define MY_RADIO_RF24
//#define MY_RADIO_NRF5_ESB
//#define MY_RADIO_RFM69
//#define MY_RADIO_RFM95

// Set LOW transmit power level as default, if you have an amplified NRF-module and
// power your radio separately with a good regulator you can turn up PA level.
//#define MY_RF24_PA_LEVEL RF24_PA_LOW

// Enable serial gateway
#define MY_GATEWAY_SERIAL

// Define a lower baud rate for Arduinos running on 8 MHz (Arduino Pro Mini 3.3V & SenseBender)
#if F_CPU == 8000000L
#define MY_BAUD_RATE 38400
#endif

// Enable inclusion mode
#define MY_INCLUSION_MODE_FEATURE
// Enable Inclusion mode button on gateway
//#define MY_INCLUSION_BUTTON_FEATURE

// Inverses behavior of inclusion button (if using external pullup)
//#define MY_INCLUSION_BUTTON_EXTERNAL_PULLUP

// Set inclusion mode duration (in seconds)
#define MY_INCLUSION_MODE_DURATION 60
// Digital pin used for inclusion mode button
//#define MY_INCLUSION_MODE_BUTTON_PIN  3

// Set blinking period
#define MY_DEFAULT_LED_BLINK_PERIOD 300

// Inverses the behavior of leds
//#define MY_WITH_LEDS_BLINKING_INVERSE

// Flash leds on rx/tx/err
// Uncomment to override default HW configurations
//#define MY_DEFAULT_ERR_LED_PIN 4  // Error led pin
//#define MY_DEFAULT_RX_LED_PIN  6  // Receive led pin
//#define MY_DEFAULT_TX_LED_PIN  5  // the PCB, on board LED

#include <MySensors.h>

#define SN "DimmableLED"
#define SV "1.1"

#define LED_PIN 9      // Arduino pin attached to MOSFET Gate pin
#define FADE_DELAY 10  // Delay in ms for each percentage fade up/down (10ms = 1s full-range dim)

static int16_t currentLevel = 0;  // Current dim level...
MyMessage dimmerMsg(0, V_DIMMER);
MyMessage lightMsg(0, V_LIGHT);

void setup()
{
	// Setup locally attached sensors
 request( 0, V_DIMMER );
}

void presentation()
{
	// Present locally attached sensors
 present( 0, S_DIMMER );

    sendSketchInfo(SN, SV);
}

void loop()
{
	// Send locally attached sensor data here
}

void receive(const MyMessage &message)
{
    if (message.getType() == V_LIGHT || message.getType() == V_DIMMER) {

        //  Retrieve the power or dim level from the incoming request message
        int requestedLevel = atoi( message.data );

        // Adjust incoming level if this is a V_LIGHT variable update [0 == off, 1 == on]
        requestedLevel *= ( message.getType() == V_LIGHT ? 100 : 1 );

        // Clip incoming level to valid range of 0 to 100
        requestedLevel = requestedLevel > 100 ? 100 : requestedLevel;
        requestedLevel = requestedLevel < 0   ? 0   : requestedLevel;

        Serial.print( "Changing level to " );
        Serial.print( requestedLevel );
        Serial.print( ", from " );
        Serial.println( currentLevel );

        fadeToLevel( requestedLevel );

        // Inform the gateway of the current DimmableLED's SwitchPower1 and LoadLevelStatus value...
        send(lightMsg.set(currentLevel > 0));

        // hek comment: Is this really nessesary?
        send( dimmerMsg.set(currentLevel) );


    }
}

/***
 *  This method provides a graceful fade up/down effect
 */
void fadeToLevel( int toLevel )
{

    int delta = ( toLevel - currentLevel ) < 0 ? -1 : 1;

    while ( currentLevel != toLevel ) {
        currentLevel += delta;
        analogWrite( LED_PIN, (int)(currentLevel / 100. * 255) );
        delay( FADE_DELAY );
    }
}

Do you have any idea why it does this?

[scalz]

@doodoovane
not sure if I get it, but the little sound could be generated by pwm freq.

Note, your last sketch is not ideal:

• don't send msg in receive(). it's better to update a variable, and check this variable in loop() for sending a msg, to avoid recursive call to receive()
• Same for your fading function, it's better to call it from loop(). Receive() should finish as fast as possible.
• don't use delay() in your fading function, it's a blocking function. It's better to do this async, in a non-blocking way, or use wait() as it can process received msg in background .

[mfalkvidd]

@scalz the delay() and send() calls are from the MySensors example, my guess is that doodoovane just followed the example.

[scalz]

@mfalkvidd
yep I noticed that. I just provided a few feedbacks for his future sketches

[doodoovane]

@scalz that's what I thought but it doesn't make any sound with the first code I posted.
Something to do with the frequency maybe?

[doodoovane]

This post is deleted!

[doodoovane]

Me again!
So the problem seemed to be the frequency as I don't have sound anymore.
With a little hindsight, I looked back at @Yveaux's messages (here and on another post) and here is what I've tried.

/**
* The MySensors Arduino library handles the wireless radio link and protocol
* between your home built sensors/actuators and HA controller of choice.
* The sensors forms a self healing radio network with optional repeaters. Each
* repeater and gateway builds a routing tables in EEPROM which keeps track of the
* network topology allowing messages to be routed to nodes.
*
* Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
* Copyright (C) 2013-2019 Sensnology AB
* Full contributor list: https://github.com/mysensors/MySensors/graphs/contributors
*
* Documentation: http://www.mysensors.org
* Support Forum: http://forum.mysensors.org
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
*******************************
*
* DESCRIPTION
* The ArduinoGateway prints data received from sensors on the serial link.
* The gateway accepts input on serial which will be sent out on radio network.
*
* The GW code is designed for Arduino Nano 328p / 16MHz
*
* Wire connections (OPTIONAL):
* - Inclusion button should be connected between digital pin 3 and GND
* - RX/TX/ERR leds need to be connected between +5V (anode) and digital pin 6/5/4 with resistor 270-330R in a series
*
* LEDs (OPTIONAL):
* - To use the feature, uncomment any of the MY_DEFAULT_xx_LED_PINs
* - RX (green) - blink fast on radio message received. In inclusion mode will blink fast only on presentation received
* - TX (yellow) - blink fast on radio message transmitted. In inclusion mode will blink slowly
* - ERR (red) - fast blink on error during transmission error or receive crc error
*
*/

// Enable debug prints to serial monitor
#define MY_DEBUG


// Enable and select radio type attached
//#define MY_RADIO_RF24
//#define MY_RADIO_NRF5_ESB
//#define MY_RADIO_RFM69
//#define MY_RADIO_RFM95

// Set LOW transmit power level as default, if you have an amplified NRF-module and
// power your radio separately with a good regulator you can turn up PA level.
//#define MY_RF24_PA_LEVEL RF24_PA_LOW

// Enable serial gateway
#define MY_GATEWAY_SERIAL

// Define a lower baud rate for Arduinos running on 8 MHz (Arduino Pro Mini 3.3V & SenseBender)
#if F_CPU == 8000000L
#define MY_BAUD_RATE 38400
#endif

// Enable inclusion mode
#define MY_INCLUSION_MODE_FEATURE
// Enable Inclusion mode button on gateway
//#define MY_INCLUSION_BUTTON_FEATURE

// Inverses behavior of inclusion button (if using external pullup)
//#define MY_INCLUSION_BUTTON_EXTERNAL_PULLUP

// Set inclusion mode duration (in seconds)
#define MY_INCLUSION_MODE_DURATION 60
// Digital pin used for inclusion mode button
//#define MY_INCLUSION_MODE_BUTTON_PIN  3

// Set blinking period
#define MY_DEFAULT_LED_BLINK_PERIOD 300

// Inverses the behavior of leds
//#define MY_WITH_LEDS_BLINKING_INVERSE

// Flash leds on rx/tx/err
// Uncomment to override default HW configurations
//#define MY_DEFAULT_ERR_LED_PIN 4  // Error led pin
//#define MY_DEFAULT_RX_LED_PIN  6  // Receive led pin
//#define MY_DEFAULT_TX_LED_PIN  5  // the PCB, on board LED

#include <MySensors.h>
#include <TimerOne.h>

#define SN "DimmableLED"
#define SV "1.1"

#define LED_PIN 9      // Arduino pin attached to MOSFET Gate pin
#define FADE_DELAY 10  // Delay in ms for each percentage fade up/down (10ms = 1s full-range dim)


static int16_t currentLevel = 0;  // Current dim level...
MyMessage dimmerMsg(0, V_DIMMER);
MyMessage lightMsg(0, V_LIGHT);

void setup()
{
  // Setup locally attached sensors
 request( 0, V_DIMMER );
 #define PWM_FREQ_HZ (25000) 
#define PWM_CYCLE_US (1000000/PWM_FREQ_HZ)

Timer1.initialize(PWM_CYCLE_US);
Timer1.pwm(LED_PIN, 1023); 
}

void presentation()
{
  // Present locally attached sensors
 present( 0, S_DIMMER );

    sendSketchInfo(SN, SV);
}

void loop()
{
  // Send locally attached sensor data here
}

void receive(const MyMessage &message)
{
    if (message.getType() == V_LIGHT || message.getType() == V_DIMMER) {

        //  Retrieve the power or dim level from the incoming request message
        int requestedLevel = atoi( message.data );

        // Adjust incoming level if this is a V_LIGHT variable update [0 == off, 1 == on]
        requestedLevel *= ( message.getType() == V_LIGHT ? 100 : 1 );

        // Clip incoming level to valid range of 0 to 100
        requestedLevel = requestedLevel >= 101 ? 100 : requestedLevel;
        requestedLevel = requestedLevel < 0   ? 0   : requestedLevel;

        Serial.print( "Changing level to " );
        Serial.print( requestedLevel );
        Serial.print( ", from " );
        Serial.println( currentLevel );

        fadeToLevel( requestedLevel );

        // Inform the gateway of the current DimmableLED's SwitchPower1 and LoadLevelStatus value...
        send(lightMsg.set(currentLevel > 0));

        // hek comment: Is this really nessesary?
        send( dimmerMsg.set(currentLevel) );


    }
}

/***
 *  This method provides a graceful fade up/down effect
 */
void fadeToLevel( int toLevel )
{

    int delta = ( toLevel - currentLevel ) < 0 ? -1 : 1;

    while ( currentLevel != toLevel ) {
        currentLevel += delta;
        analogWrite( LED_PIN, (int)(currentLevel / 100. * 255) );
        delay( FADE_DELAY );
    }
}

No more sound, but now Can't get it more than 99% in domoticz... The only way to get 100% is to turn it off and turn it back on. As long as you touch the slider, no more 100%...

Any clue of what can cause this?

[Yveaux]

@doodoovane why do you use analogwrite instead of Timer1.setPwmDuty?
Also, the fading should not be required for a fan.
Iirr the maximum duty value is 1023. Likely the fan won't be at its maximum speed then, only when you supply it a continuous high 'pulse'. Is that what you mean by 99%?

[doodoovane]

@Yveaux said in PWM control:

Timer1.setPwmDuty

I did but there must be something wrong with my code as the PWM doesn't work anymore.
Here is my try:

#include <MySensors.h>
#include <TimerOne.h>

#define SN "Fan_PWM"
#define SV "1.3"

#define LED_PIN 9      // Arduino pin attached to MOSFET Gate pin
#define FADE_DELAY 10  // Delay in ms for each percentage fade up/down (10ms = 1s full-range dim)


static int16_t currentLevel = 0;  // Current dim level...
MyMessage dimmerMsg(0, V_DIMMER);
MyMessage lightMsg(0, V_LIGHT);

void setup()
{
  // Setup locally attached sensors
 request( 0, V_DIMMER );
 #define PWM_FREQ_HZ (25000) 
 #define PWM_CYCLE_US (1000000/PWM_FREQ_HZ)

Timer1.initialize(PWM_CYCLE_US);
Timer1.pwm(LED_PIN, 1023); 
}

void presentation()
{
  // Present locally attached sensors
 present( 0, S_DIMMER );

    sendSketchInfo(SN, SV);
}

void loop()
{
  // Send locally attached sensor data here
}

void receive(const MyMessage &message)
{
    if (message.getType() == V_LIGHT || message.getType() == V_DIMMER) {

        //  Retrieve the power or dim level from the incoming request message
        int requestedLevel = atoi( message.data );

        // Adjust incoming level if this is a V_LIGHT variable update [0 == off, 1 == on]
        requestedLevel *= ( message.getType() == V_LIGHT ? 100 : 1 );

        // Clip incoming level to valid range of 0 to 100
        requestedLevel = requestedLevel > 100 ? 100 : requestedLevel;
        requestedLevel = requestedLevel < 0   ? 0   : requestedLevel;

        Serial.print( "Changing level to " );
        Serial.print( requestedLevel );
        Serial.print( ", from " );
        Serial.println( currentLevel );

        Timer1.setPwmDuty(LED_PIN, requestedLevel);

        // Inform the gateway of the current DimmableLED's SwitchPower1 and LoadLevelStatus value...
        send(lightMsg.set(currentLevel > 0));

        // hek comment: Is this really nessesary?
        send( dimmerMsg.set(currentLevel) );


    }
}

What I mean by 99% is that the slider of the dimmer when pulled to 100% come back to 99% (as I can see in my switch log) in domoticz. And there is no "100%" input just like if I pulled the slider to 99%...

[doodoovane]

Hello everyone,

I'm still stuck with my problem as I don't fin any solution.
Is there a way to say in the code "if level is at 100%, stop the PWM regulation (full power fan)" ?

Thank you for your help

[mfalkvidd]

@doodoovane you can change

requestedLevel = requestedLevel > 100 ? 100 : requestedLevel;

to

requestedLevel = requestedLevel > 98 ? 100 : requestedLevel;

[doodoovane]

@mfalkvidd said in PWM control:

requestedLevel = requestedLevel > 98 ? 100 : requestedLevel;

Thank You @mfalkvidd it works that way! Domoticz still showing me his 99% but at least the fan is going 100%.

Thank you for your help, sometime thing can get easier