Change PWM Frequency ?

[forgoden]

Whats the easiest way to change PWM Frequency?

Default is 1khz and dimming leds will flickering

I am using ESPEasy_v2.0.0-dev10

[Domosapiens]

PWM frequency is 1kHz by default. Call analogWriteFreq(new_frequency) to change the frequency.

I don't see any call to analogWriteFreq in the source.

Thought experiment:

You could try to add a line:
analogWriteFreq(new_frequency)
to module:
_P001_Switch.ino
in the section:
case PLUGIN_INIT
as first line

So

Code: Select all

case PLUGIN_INIT:
{
// add this line
analogWriteFreq(5000) //should give 5Khz
// go on with existing code
if (Settings.TaskDevicePin1PullUp[event->TaskI ....

and compile your own version

Integration of this function in the GUI by the Dev's, could be an enhancement of (already great!) ESPEasy.

[forgoden]

Thank you very much! Are there any instructions how I can compile the source of espeasy?

I want to build

ESPEasy_v2.0.0-dev10_normal_4096.bin

again with changed pwm frequency.

[Domosapiens]

See the Wiki:
https://www.letscontrolit.com/wiki/inde ... evelopment
https://www.letscontrolit.com/wiki/inde ... Platformio

Not that complicated ...even I did it

[Ernst]

How can you see the led's flickering?
A human doesn't see flickering above 50Hz?

I use PWM on ESP a lot and not 1 is flickering

Gr Ernst

[ahlermi]

I had testet with

Code: Select all

    case PLUGIN_INIT:
      {
        // add this line
        analogWriteFreq(31300); //should give 31300Hz
        // go on with existing code
        

no reaction, same result, fan is making noise if it is set under pwm 900

on arduino is no noise with

Code: Select all

void setup() {

TCCR1B = TCCR1B & 0b11111000 | 0x01; // Setzt Timer1 (Pin 9 und 10) auf 31300Hz
}

[toffel969]

I had testet with

Code: Select all

    case PLUGIN_INIT:
      {
        // add this line
        analogWriteFreq(31300); //should give 31300Hz
        // go on with existing code
        

no reaction, same result, fan is making noise if it is set under pwm 900

on arduino is no noise with

Code: Select all

void setup() {

TCCR1B = TCCR1B & 0b11111000 | 0x01; // Setzt Timer1 (Pin 9 und 10) auf 31300Hz
}

One question, one suggestion:

Question: when you say "on Arduino", do you mean on a physical Arduino, or do you mean an ESP8266 using Arduino IDE

Suggestion: I had the same problem with fan noise, I put a capacitor (rather large) that helped a lot.

[ahlermi]

physical Arduino

https://we-mod-it.com/board258-diy-do-i ... m-steuern/

[toffel969]

physical Arduino

https://we-mod-it.com/board258-diy-do-i ... m-steuern/

I don't think the pwm on ESP has the same quality. Maybe you can use the I2C pwm extender.
Then I suggest you try the solution with a cap, it will smoothen the ripple. Das Pfeifen ist dann zwar auch nicht ganz weg, gefühlt aber 90-95% reduziert, (220µF)

[cr3pt]

So no changes for fixit via software?

[Domosapiens]

Vote here a thumb up:

https://github.com/letscontrolit/ESPEasy/issues/575

[ahlermi]

in witch way would you build in the capacitor?
pwm + and ground - ?

[toffel969]

in witch way would you build in the capacitor?
pwm + and ground - ?

yes, and you might want to add a resistor too (its then a Low-pass filter) https://provideyourown.com/2011/analogw ... o-voltage/

[cr3pt]

And that help you??

[toffel969]

Yes it reduces the squeaking noise on the fan by about 90%

[ahlermi]

the result of adding the condensator is that speed is always i think 100%

[toffel969]

the result of adding the condensator is that speed is always i think 100%

No, it doesn't make sense to me, nor reflects actual expierience

[ahlermi]

Meine Lösung

[bastibasti]

strange that this option is not implemented, as a command.

I think instead of recompiling (which usually breaks things)

I think i will have to add an avr that reads the pwm from the esp and outputs on different frequenccy

[Domosapiens]

Did you see?

Code: Select all

PWM,<GPIO>,<duty>,<duration>,<frequency>

https://espeasy.readthedocs.io/en/lates ... hlight=pwm

[malla]

Hey guys,
i am desperatrly looking for a release which includes working PWM-Frequency settings.
I read that the moving from the GPIO functionality out of the Swith-Module caused some problems, and that this might caused the functionality was removed accidently.

I am happy for any hints in this direction =)

The lastest release:
-duty-cycle is set correctly, but the frequency remains at 1kHz instead the 2.5kHz as in the command

Code: Select all

PWM,14,250,1000,2500

wanted.


The command leads me to this outcome.

pwm.PNG (30.56 KiB) Viewed 3546 times

Code: Select all

INIT : Booting version: mega-20190607 (ESP82xx Core 2_4_1, NONOS SDK 2.2.1(cfd48f3), LWIP: 2.0.3 PUYA support)
59 : INIT : Free RAM:24960
60 : INIT : Warm boot #6 - Restart Reason: External System
62 : FS   : Mounting...
87 : FS   : Mount successful, used 75802 bytes of 957314
438 : CRC  : program checksum       ...OK
475 : CRC  : SecuritySettings CRC   ...OK
583 : INIT : Free RAM:22160
585 : INIT : I2C
585 : INIT : SPI not enabled
599 : INFO : Plugins: 47 [Normal] (ESP82xx Core 2_4_1, NONOS SDK 2.2.1(cfd48f3), LWIP: 2.0.3 PUYA support)

I am using to PWM-Power some Fans with that, sadly we can hear the 1kHz, so 20kHz would be nice

[lm317t]

hi anyone! i want to change the frequency too
I also found how to change this:
PWM,<GPIO>,<duty>,<duration>,<frequency>
my code rules has the form
pwm,12,100,0,500
but the frequency remains 1 kHz
I am in complete despair((
why the developer gave the instruction and is silent that it is invalid

[grovkillen]

PWM,<GPIO>,<duty>,<duration>,<frequency>

Try duration to something above 0. Does it work then?

[malla]

as you can see in my post above it is not working.

[grovkillen]

I asked you to do a longer interval than zero. Try 1000 as a test.

[grovkillen]

Ok, I saw your first post now. Sorry. We need to test it ourselves.