Adding a Cpap blower to a duet 3 mini 5+
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I’m looking to wire in a CPAP blower into my duet 3 mini 5+. I need a 5v control wire for the blower speed control board, and what ever adjustments in the config file I’ll need to get it working as the new parts cooling fan.
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@ratrig0331 so long as you are not using out6, you can use the LASER/VFD output. This provides
5V buffered output shared with out6, along with 5V and ground supply (see note 2 below). Provides a 5V PWM signal to drive hobby servos, and PWM->analog controls for VFDs or Lasers. Note out6 PWM pin is shared with OUT_6
Ian
Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth
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@droftarts Awesome that answers my question, I am using out 6 but I can splice that with a different fan output
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@droftarts I final got around to finish wiring everything what do I need to add to the config file to get the out-6 pwm output working?
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@droftarts I got the blower working off the duet 3 mini 5+ 5v pwm pin, but I had to add the ground pin the off the blower started running. No matter what I try with the gcode I can’t seem to control and lower the 5v signal
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@ratrig0331 try inverting the pin in config.g, eg
M950 F2 C”!io6”where the ! sign inverts the logic of the io6 pin.Ian
Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth
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@droftarts I’m using the Vfd pwm 5v can I not use this to control speed or am I stuck neededing a iopin?
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@droftarts never mind I got it now I was using the 5v out that must be a Constant instead of the “buff” pin it works as it should now thanks for your help
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@droftarts one more question is there a way to set the max voltage output lower so when I’m using it as a cooling fan at 100% it’s really only 50% of what it can do?
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@ratrig0331 if you define your output with a M106, you can set the max. speed with the X parameter.
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@cosmowave ok so it would look like this?
M106 P1 C”Cpap” S0 H-1 X.5
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@ratrig0331 Yes. I think this should work
Mankati FSXT+, DeltaTowerV2, E3D MS/TC
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@cosmowave thanks I’ll try it out tonight when I get home
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@cosmowave that worked to slow down the blower thanks!
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@ratrig0331 Just curious what you're using a cpap blower for... to control your duet machine or to help with sleep apnea?
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@code7 no I’m using it for part cooling on my 3d printer to bring cool air from outside my enclosure in. Yes I know that sounds a bit counter productive for a enclosure. But I was having a problem with the enclosure getting too hot inside not only for part cooling but melting the 3d printed carriage as well. My chamber is heated but only turns on to help stable out the start temp after that the large 510x510mm bed heater keeps things around 60c at a bed temp of 80c than I use 4 side blowers that draw from the bottom of the enclosure to the top to circulate the air evenly
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@ratrig0331 Great use of an old cpap machine
