extra fan output

Kevin

hello

I am making an enclosure for my printer but I have the following.

I have printed a voron 2.4 air filter box but I have on my duet 2 (2.05.1) no more free pwm pins for the air filter box to be able to control.
currently M106 pwm hotend, part cooling, case fan.

what can i do best use giopins with macros for extra fan, or work with a w1209 with a buck converter for switching air filter fan

thanks

Phaedrux

If you have a free heater pin you could use that as a fan as well.

RRF3 syntax:

M950 F3 C"e1heat" ; use e1heat pin as fan3
M106 P3 S1 H1 T45 ; set fan 3 thermostatic with heater1 at 45c

DIY-O-Sphere

@Phaedrux

on my duet 2 (2.05.1)

@Kevin
Example for RRF2 (switch air filter fan on when hotend reaches 150°C)

M307 H3 A-1 C-1 D-1 ;disable heaters
M106 P3 S1 H1 T150 ; set fan 3 thermostatic with heater1 at 150c

Fan then has to be connected to heater3 (Pin8) on the extension port

Kevin

@DIY-O-Sphere

I should use pin 2- and pin 8+ for the fan 24v

I use M141 H2 for chamber heater value and M305 P2 for themistor

M307 H3 A-1 C-1 D-1; switch off heaters
M106 P2 S1 H2 T (temp); set fan 3 thermostatically with heater2 on (temp)

, if this is correct, then the fan starts to an adjusted value of chamber heater on themistor P2

DIY-O-Sphere

@kevin said in extra fan output:

M106 P2 S1 H2 T (temp)

M106 P3 S1 H2 T (temp)

P3 is the switched output, H2 the monitored heater channel

But we have overlooked that this is only a logic channel. You still need a mosfet, relay or Duex to switch the load.
https://duet3d.dozuki.com/Wiki/Using_servos_and_controlling_unused_IO_pins#Section_RepRapFirmware_2_x_and_earlier
So please do not connect a load directly!

Kevin

@DIY-O-Sphere
thanks for the responce,

I do not have a duex 2/5 and I don't have the experience to work with mosfet or relais to get this working

I think I will make a consideration to work with a w1209 module set temp and the fan starts

DIY-O-Sphere

@kevin
PS_ON is capable of switching this. However, I don't know a simple solution for RRF2 how it can be controlled with the fan code.

Kevin

@diy-o-sphere
thanks for the explanation and the thinking I will continue to see how I am going to solve this