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Does anyone know of a wire pullstrength sensor ?

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Kjelt:
Ok problem is as follows, I have a tubemotor unwinding a solarscreen or windowscreen and on the other side a tubemotor with two wires pulling this screen so it is tense/flat.
Actually so it covers the ceiling and if the pullstrength is too low it will hang towards the floor.

I am looking for a sensor i can put inbetween the Nylon or metal wire that gives a uC an indication about the pullstrength on the wire so it can control the second motor to sync to the first and it does not have to be very accurate.

Has anyone seen something like this or knows alternatives?  :-+

KL27x:
Sounds like you want a strain gauge.

I would consider trying to estimate the relative load, indirectly, by way of motor current consumption.

OM222O:
just use a load cell (an aluminum block with a strain gauge glued to it) with a suitable amplifier module (both of which you can find on amazon for dirt cheap).
Just use a suitable load cell which goes up to the force you require.

Benta:
Far too complicated.

Just let the "pulling" tubemotor run and disengage the other (let it run free or lightly braked). When the screen is in place, brake the second tubemotor and by monitoring current in the pulling motor stop it at this point.
Your screen is now taut.

Works in the other direction as well.

soldar:
 
--- Quote from: Kjelt on May 15, 2019, 08:54:10 pm --- Ok problem is as follows, I have a tubemotor unwinding a solarscreen or windowscreen and on the other side a tubemotor with two wires pulling this screen so it is tense/flat.
Actually so it covers the ceiling and if the pullstrength is too low it will hang towards the floor.
--- End quote ---

I do not know the particulars but it sounds like a bad design to begin with. In principle you do not need two motors at all as you can have one rolling up the screen and working against a constant tension provided by weight, spring or whatever.  Having to control two motors to achieve the correct tension seems unnecessarily complex IMHO.

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