Water cooling flow sensor with Duet

[zerspaner_gerd]

Thank you very much @dc42, that helps a lot.

The Flow Sensor has only 3 cables (GND, VIN, signal), do I need any invert PWM of fan?

And how can I read out the PIN PB6 so that a trigger is triggered at PWM 0?

I could not find a PIN number here either.
https://duet3d.dozuki.com/Wiki/Using_servos_and_controlling_unused_IO_pins

I understand that correctly, to leave the permanently connected I need a signal diode.

[dc42]

You don't need to configure a pin number, because pin PB6 is pre-configured for a fan RPM sensor. If the flow sensor uses greater than 3.3V power, use a diode between its output and PB6.

[zerspaner_gerd]

@dc42
And how can I imagine monitoring?

Would be at a loss how I should implement that.

I have to create a reaction somewhere.

[zerspaner_gerd]

Hello @dc42 ,

How can I work with the RPM signal.
It will now be displayed in DWC.

Now I need a way somehow trigger a Macro.

[dc42]

Currently the firmware does not have any facility for taking an action based on the RPM reading.

[fma]

It should be easy to build one, using an integrator (simple capacitor?) and a trigger, sending the signal on an unused endstop, which can in turn activate a macro...

[zerspaner_gerd]

@dc42,
Okay then I know that.
Thanks

@fma said in Water cooling flow sensor with Duet:

It should be easy to build one, using an integrator (simple capacitor?) and a trigger, sending the signal on an unused endstop, which can in turn activate a macro...

That sounds good but I have no idea how to build something like that.

[fma]

In fact, a board based on a 555 is even better:

https://www.qwant.com/?q=555 missing pulse detector

David, is it possible to connect the output of the 555 to the endstop input, if the 555 is powered with 3.3V (using a TLC555)?

[dc42]

@fma said in Water cooling flow sensor with Duet:

In fact, a board based on a 555 is even better:

https://www.qwant.com/?q=555 missing pulse detector

David, is it possible to connect the output of the 555 to the endstop input, if the 555 is powered with 3.3V (using a TLC555)?

Yes, that should work.

[fma]

Thanks! I'm going to make a prototype...