3 fans on tool board 1lc?

[gloomyandy]

@gnydick You can't normally connect io0.out directly to a fan. But if any of the fans are 4 wire you may be able to control the speed with the logic level output, you would need to check the voltage required by the fan on the pwm input and the current it might draw. That's assuming you are not already using io0.out for something like a bl-touch. You may be able to use io0.in as a logic level output (again assuming it is not already being used), but I'm not sure if it is pwm capable or if there is any risk to the board if you do that.

[gnydick]

@gloomyandy, yep, I'm using IO0 for filament sensor/eject button

[gloomyandy]

@gnydick are you using both io0.in and io0.out?

[gloomyandy]

@gnydick What version of the 1lc do you have?

[gnydick]

@gloomyandy yes, using all of the pins. The latest version.

[gloomyandy]

@gnydick Assuming it is a rev 1.3 board (possibly also on 1.2), there is an unpopulated pad for IO_3.in which you may be able to solder a wire to. I'm not sure if this can be used as an output though at least for pwm output, if not you may be able to shuffle some of the pins you are already using around and use io_3.in for an input. Other than that I think you are out of luck.

[dc42]

@gnydick said in 3 fans on tool board 1lc?:

@gloomyandy yes, using all of the pins. The latest version.

Including io0.out ? You said you were using IO0 for the filament sensor eject button, but I would have thought you only needed to use io0.in for that.

[gnydick]

@dc42 2 switches, filament out sense, and eject button the specs are here, https://www.orbiterprojects.com/orbiter-filament-sensor/

[dc42]

@gnydick you could free up IO0.OUT by using one of the buttons on the tool board for filament unload instead of the one on the filament monitor; or you could connect the filament monitor button to the IO3_IN pads instead.

[gnydick]

@dc42 very true, very true.

[dwuk]

@gnydick - did you manage to get a 3rd fan working ok using the suggestion by @dc42 ?

I am trying to wire up a Sovol SV08 extruder (which also has 3 fans) - I was thinking I would have to run separate cables for the 3rd fan - but it would be neater if I could avoid this.

My current thinking is in the attached diagram.

[jay_s_uk]

@dwuk assuming 2 fans are the part cooling fans, could you not just run them in parallel off the same connector? Assuming combined they pull less than 1A

[dwuk]

@jay_s_uk I think you might be right. Checking the wiring the two cooling fans are connected to FAN2 and FAN4 on the Sovol Board.

Which are in turn defined as generic fans fan0 and fan1 - in printer.cfg
[fan_generic fan0] # back model cooling fan
pin: extra_mcu:PA7
max_power: 1.0

[fan_generic fan1] # front model cooling fan
pin: extra_mcu:PB1
max_power: 1.0

From looking at the macro.cfg - it looks like fan0 and fan1 are switched on and off together - so will try wiring them both up to Out2 as you suggest

Next issue is the fans are probably 24v - so might have to change the fans?

[gcode_macro M106]
gcode:
{% set fan = 'fan' + (params.P|int if params.P is defined else 0)|string %}
{% set speed = (params.S|float / 255 if params.S is defined else 1.0) %}
{% if fan == 'fan3'%}
SET_FAN_SPEED FAN={fan} SPEED={speed}
{% else %}
SET_FAN_SPEED FAN={'fan0'} SPEED={speed}
SET_FAN_SPEED FAN={'fan1'} SPEED={speed}
{% endif %}

[gcode_macro M107]
gcode:
{% set fan = 'fan' + (params.P|int if params.P is defined else 0)|string %}
{% if fan == 'fan3'%}
SET_FAN_SPEED FAN={fan} SPEED=0
{% else %}
SET_FAN_SPEED FAN={'fan0'} SPEED=0
SET_FAN_SPEED FAN={'fan1'} SPEED=0
{% endif %}

[T3P3Tony]

@dwuk said in 3 fans on tool board 1lc?:

Next issue is the fans are probably 24v - so might have to change the fans?

What voltage are you supplying the toolboard?

[dwuk]

@T3P3Tony I think I'm going to need 24v for the hot end - so 24v input I guess.

[dwuk]

@T3P3Tony Ah - I see you can select the output voltage as being VIN (I didn't spot that initially) - so I think that way I will be able to get 24v on Out1 and Out2 - so that should solve my fan issue. thanks

[gnydick]

@dwuk I just ended up getting blowers without tachs and wiring them up in parallel.

[dwuk]

@gnydick Thanks - I think that is what I am going to do too. Or I might just only have one blower fan.

[dwuk]

@dwuk Now wired up.

One of my blower fans is 2 wire and the other 3 - so I think that works quite well.

Only issue I had was finding gnd for out_2. Ended up taking it off of IO1.

[dwuk]

@dwuk Update

First tried with 3 fans connected to +VOUT and GND on both Out1 and Out2.

• Fans were permanently on full speed.

Next tried with3 fans connected with out1/out2 and GND.

• None of the fans would work.

Finally found some more documentation that says you have to connect the red wires to +VOUT and Negative connections Out1 and Out2. - even though the diagram for the 1LC says that these are VIN or 12v+

• Tried that and it seemed to be working - but then I got burning smell from 2 pin fan (which was connected to the same Red and Black as the 3 pin fan).

Good news though is that the 3 pin Hotend and cooling fans both now work properly.
I think however that the 2 pin fan is fried - so will have to get another one and work out how to connect it.