Posts made by clearlynotstef

@droftarts @Phaedrux
2 related questions:

1. Forgetting pwm, would it be possible to get a 5v binary on/off pin that could be controlled by firmware as a fan on the duet wifi 2? The cpap board has a speed knob I could use to set the power, I can put it somewhere appropriate and just use the board to turn it on and off;

2. Alternatively, if I can't get a 5v pin with or without pwm, I'll see what happens if I just give it a 3.3v pwm signal. Presumably it'll just run between 0-60% or so? Is there a preferred pin to use for this with pwm? What's the gcode look like to create a pwm pin and assign it to be the part cooling fan?

Thanks

@droftarts related question then...Would a new Duet 3 board be able to drive this 5v pwm directly? I've been looking for a hardware reason to upgrade anyway!

@Phaedrux so, any ideas?

@phaedrux
Most of the info is in my prior post/the screenshot/video linked therein:
https://forum.duet3d.com/topic/28198/cpap-blower-fan?_=1650921126293

Here's the fan/board (the 24v one):
https://a.aliexpress.com/_m0re36Q

@clearlynotstef starting to wonder if this is even possible, are all the unused pins 3.3v? And the fan headers, they do the pwm on the ground rather than the +, no? So I couldn't even step down the fan+ to 5v or something? How can I get a 5v pwm pin to this driver board (and how do I tell duet it's my part cooling fan)? Hope I can make this work.

@diy-o-sphere for $3 I could just use an esp8266 to connect to my Wi-Fi, monitor a pin on the duet and do the call to my smarthome setup to trigger the routine. I've used Shellies for other things but the nodemcu would be simple for this one. Mostly I want to do it from duet directly and I'm honestly surprised I cannot. The duet is already on my network, already interacting with other things on my network, and RRF is so well thought out and capable I'm just shocked there's no way to tell it to send an http get/put

@jay_s_uk said in Http Post from Macro:

@clearlynotstef no, there isn't. Not in standalone mode anyway.
You can use nodeDSF to monitor the printer for events etc.
The other way would be to use SBC mode (if you have a duet 3 or duet 3 mini) and use one of the APIs or execonmcode

just duet Wi-Fi 2. I could rig a cheap esp8266 to a pin and have it do the call when gcode drives the pin, just seems crazy that the duet is already on my network and communicating but I need to use a whole additional MCU to do a simple one line long http request!

Hi friends, I'm trying to control a cpap fan that has its own controller board that needs a 5v pwm pin from my duet Wi-Fi 2 for control. I use 24v/VIN hotend fans so I can’t use a fan output to drive this (need a 5v pwm signal for this driver board). Duet WiFi 2. Fw 3.3.x, new to the new firmware so not super familiar with how to make this work… can I grab a 5v pwm pin from the unused expansion header and define it as a part cooling fan such that my slicer will turn it on and off and such? Which pin? What’s that gcode look like?

Thanks in advance for any help!

@jay_s_uk btncmd looks like it'll go an http get based off clicking a button on dwc dashboard, but is there a way to do so automatically in a macro or in pause.g?

Ok so stuff came in to set this up. I use VIN hotend fans so I can’t use a fan output to drive this (need a 5v pwm signal for this driver board). Duet WiFi 2. Fw 3.3.x, new to the new firmware so not super familiar with how to make this work… can I grab a 5v pwm pin from the unused expansion header and define it as a part cooling fan such that my slicer will turn it on and off and such? Which pin? What’s that gcode look like?

Thanks in advance for any help!

@dc42 sorry to bump an old thread, but now that I’m on fw 3.x and there were so many changes to firmware, is there now a way (preferably g code) I can execute a simple http request on my network? As when I started this thread, I’d like my filament monitor to call an http put/get/whatever to trigger some smarthome stuff

@mrehorstdmd for what it’s worth, I don’t think his concern is air temperature, but rather keeping equal or negative pressure in the chamber so as not to vent particulates into the room via positive pressure in the chamber

@imadunatic depends on the positioning. Mine are in an open space (top of a delta) and I definitely would not need cooling driving anything the board is capable of driving. If it's in a tight little box with one little air hole and bolted in so the back of the board is right up against something, then I'd use cooling

Saw an interesting video on how to set up a cpap blower for part cooling and want to try it out. The motor comes with a control board that seems like I should just be able to connect straight to a pin on the duet and be good to go, but wanted to see if there are any concerns or if I should add a diode or something in the middle.
Video: https://youtu.be/E3kBau82SwU

When setting up a delta, maximum carriage travel doesn't show an error even when it's lower than homed height, but it won't advance (i.e. it recognizes the error but doesn't display it when you enter the information

@phaedrux also, replacement heaters are pricy! What happens if i pid tune a 12v heater with 24v power supply? Wouldn't it just cycle pwm faster to keep it at the set temp? Isn't there a parameter I can adjust to use what I've got already?

@phaedrux 24v it is... I think the one I have is 350W (14.6 amp). That should do the trick?

@phaedrux it took me like 3 hours to remember the fans not my only issue all my other hotends are 12v heaters

Duet Wi-Fi 2, delta, smart effector. Currently everything is 12v, bed heater is AC 115V/SSR. Many fans and whatnot are all set up nice on 12v. Turns out me new hotend is looking for 24v . I have an unused 24v power supply, just never used it because 12 did the trick and I like my fans. What's the easiest way to use two power supplies here? I could use 24v and put buck converters between the duet and the smart effector for the 4 fan wires I suppose, but the only buck converters I have on hand are crap tiny SMD boards and I'd hate to introduce another cheap component to break and disable my hotend fan ruining prints! Is there any way to feed a trace on the duet that runs only to the fans from a 12v power supply and the rest of the duet from 24? How does electricity work anyway, if I hardwire the fan+ to a 12v+ and hook the fan- to the duet would it explode, work, or get 24v anyway?

Any ideas on dual power supply wiring schemes or should I just start trying to find new fans I like as much as my current ones?

Over many years on 12v systems I've built up an alarming number of assorted fans. Axials, blowers 20mm-50mm, hotend/print cooler, fast or quiet, wide pwm range/practically binary on off. Eventually over time you find those great fans. I'm considering jumping to 24v. I'd like to skip the steps where I acquire a bunch of crap fans and start with the gems.
I prioritise airflow over volume gimme the ones that really move air.
For each fan I'm good with deeper than usual fans (e.g. 40x40x20 over 10) as I have more space on that axis for all of them. For the blowers, ideally they'd respond well to speed control but not critical (I wouldn't trade any airflow for pwm).

As a starting point for what I'd need:
30x30 axial (hotend) fans
40x40 axial (hotend) fans
30x30 blower
40x40 blower

Anyone feel like pointing me towards their favorites?