@ockray83 You can just use F100 parament in M106 on the earlier firmware version to set the frequency. Currently, I'm not near my printers and can't try that.
Also, have to mention that previously, everybody suggested using F about 25500, but now Makerhive advises to set it extremely low. Hope that helps.
@dougal1957 said in Berd-Air - poor pwm response with ez switch:
@ockray83 have you tried adjusting the PWM Frequency in RRF I use a bird air system (have done for years) but I used a @dougal1957 on mine and don't have any issues. Check M950 Qnn parameter
Thanks, @dougal1957 for another lead. Looks like the power expander hasn't optoisolator as utilized in e-z switch controller. So maybe that's the main reason for such poor pwm control.
@dc42 That's great news. Thanks, David!
When do you plan to release it? an approximate date
Just saw on GitHub some edits for Smart Effector firmware with mentioning a HARDWARE VERSION 3. Does it mean that soon a newer version could be announced?
@ockray83 said in Berd-Air - poor pwm response with ez switch:
Update: makerhive got back to me and are sending me a new switch, they believe mine is defective. I should get it in a few days.
Just got the same problem... Did you already receive a new ezswitch from makerhive and did it really solve your issue?
@caijonas said in Acclerometer on a Delta printer:
Is it possible to eleminate more than one frequenzy? E.g. M593 P1 F30 F60?
Also interested in that... is it even possible, and will it be in 3.4 firmware?
@bearer Anyway, thanks for your help. I will try to sol that issue with the Arduino community. I think I'm missing something.
@bearer said in Controlling AC Aquarium pump:
Does the duration not change when you adjust the fan speed in DuetWebControl?
Yep, nothing changes when I try to adjust the fan speed in DWC.
If you set the fan frequency say 1000hz that should give you a peroid of 1000us, and the value of the fan speed in percent should be a factor of 10. I.e. 50% fan speed should give you 500us for the duration?
I have tried to change fan frequency by M106 p0 F1000, but that also didn't help. The serial monitor still shows the same duration readings between 6-7 .
7
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@bearer said in Controlling AC Aquarium pump:
something like pulseIn()
I have tried pulseIn() in code bellow, Arduino D7 was connected to Duet FAN0-
int pin = 7;
unsigned long duration;
void setup() {
Serial.begin(9600);
pinMode(pin, INPUT_PULLUP);
}
void loop() {
duration = pulseIn(pin, HIGH);
Serial.println(duration);
}
But when I tried to change fan speed in DWC nothing happens.
Serial monitor always shows weird readings between 6 and 7.
@bearer said in Controlling AC Aquarium pump:
If the goal is to adjust the speed based on a fan setting when printing then something like pulseIn() will suffice to interface the Duet and Arduino.
I forgot to ask about wiring. Is it correct that I have to connect one of VFAN pins to one of the Digital Arduino pins, and then connect +5v and GND pins from Expansion Duet header with the same on Arduino to power it?
@bearer Thank you so much for those tips and links. Hope that helps me make it work. 
@bearer It sounds easy enough, but as I mentioned before I'm not an expert in electronics.
It is definitely clear from that module documentation how to make it work with an Arduino... but how to make Arduino work with a Duet board.
It looks like I have to get some readings from a 2-pin fan header, but I'm not sure what exactly... do I need just a voltage measurement or get some kind of a PWM signal?
If you know more about that or how to do that in the best way, or even can give any links for tutorials which can help me to handle that I will appreciate that a lot.
@FelixH said in Controlling AC Aquarium pump:
@uvarovkv Why don't you use an arduino to control the fan as well?.
But I don't want to get just a separate dimmer, my main goal to make it work with Duet.
@bearer said in Controlling AC Aquarium pump:
Are you planning on running this as a dimmer/speed control or just on/off?
Yes, I want to get it as dimmer for an AC pump controlled through Duet web-UI.
@FelixH said in Controlling AC Aquarium pump:
Hi there,
on the module link you posted, they suggest an Arduino as controller board. They even developed a library to make things easier. Maybe you could go that route to make things easier for you? The Duet boards are CNC controller boards (3d Printer, Lasers, routers, etc.), not a general microcontroller boards. Even if you could use it for your module (which surely you can, I guess), I don't find it the best solution. Think it that way, if you blow up an Arduino, it costs 10 bucks to replace. If you blow up a Duet, you're on the 100+ range.
Thank for your reply! That is an option with Arduino, but how to connect an Arduino with Duet which will acting as a cooling fan?
Continuing this thread I also have interested in the idea of using an AC aquarium pump for a Berd-Air style cooling solution. I found this module and want to try it with my duet.
But since I'm not an electronics specialist and I'm terribly afraid to fry my board, so I will really appreciate if anyone could help me with a wiring diagram of this module with a Duet board.
David, many thanks for such a rapid response!
Hi! I incidentally hit inductor L1 with my screwdriver and completely destroy it. 
I have desoldered it and check that pads for it are ok.
I have found out from Tony's scheme placed on GitHub that its inductance is 22uH... but what resistance or maximum current I have to select for order from a chipstore?
Also should I choose a shielded version or unshielded will be ok too?
You must try an office paper puncher. It's really easier than drilling and you can get a neater hole. 