Can i use a Reed switch to detect if my motor is spinning?

[Lucien Nunes]

Yes, easily, either as a go/no go signal or speed proportional voltage etc.

 

[Holewski]

Great, what do i need to research? what should i search for?

 

[Lucien Nunes]

It's a simple job for whoever is designing the analog side of things. E.g. an F-to-V can be implemented by triggering a monostable with the pulses and rectifying and LPF'ing the output. But as SheffSimon points out, before getting to this level of detail one needs a lot more info on what it is trying to achieve, which isn't really practical on an open forum. We can knock ideas about at a conceptual level though .

 

[marconi]

With a view to keeping things simple again, might you look into a fan with an integral or attached centrifugal switch which closes when it is running at a high enough speed? Connect the contacts (Normally Open) on each fan and wire them in series and use this combined switch (Logical AND) to confirm all fans are running to cool the glass; and as the safety logic in the control of power to a gas valve for the burner? If any fan drops below speed or stops the gas is cut off.

https://www.google.com/search?q=fan....1.69i57j0.13861j0j8&sourceid=chrome&ie=UTF-8
[automerge]1574154467[/automerge]
I'd also include a thermal trip device (my #7) in series with the power supply to the gas valve.