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Get speed from peristaltic pump, add magnet and hall effect?
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rhodges:

--- Quote from: DaJMasta on August 20, 2019, 10:07:22 pm ---Do you think swapping in a stepper for the standard motor could be an option? 

--- End quote ---
No. The motor shaft is matched to the rollers so that the friction is "just right".

I know parts will wear out and fail, so I will have spares at all times. These pumps are less than $4 each.

I appreciate your point about the flow being a function of pump speed. That is why I think this type is the best for my application. I want slow, steady, and safe failure.

Thanks!
cv007:
>With a peristaltic pump it all probably looks the same whether liquid/no liquid, so that would probably be of no use

>I want to detect stalling

Well, then maybe measuring back emf between pulses would work for that. Stalled = no movement = no back emf = seeing supply voltage through motor.  Not stalled = some back emf =  less than supply voltage seen depending on rpm. Although you can't really measure the liquid load as it will look similar enough whether pumping liquid or an empty tube, I would think you can at least determine if the motor is moving at all. There probably is no middle ground- its moving or its stalled.
David Hess:
Back EMF and current sensing can be made to work but a hall effect sensor or an optical interrupter will be simpler.  Multiple magnets or blades will allow multiple pulses per revolution if desirable.
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