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 :)

PWM control

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