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Anonymous Poster

strain gauge operated motor

03/14/2008 11:37 AM

i am trying to cteate a ciruit which drives a motor from the output of a strain gauge.i need the motor to remain still untill the output voltage reaches a set level, then once this level is achieved, the motor starts.
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#1

Re: strain gauge operated motor

03/14/2008 11:50 AM

Standard strain gauge bridge, amplified with an op amp. The output goes to one input of a comparator, the other comparator input goes to a potentiometer so that you can set the threshold. The comparator output switches a relay/ FET/Triac controlling the motor.

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#2

Re: strain gauge operated motor

03/14/2008 12:59 PM

Do you want to use a single strain gage? or can you use a half or full bridge?

Do you work under variable temperature ?

Do you accept a dispersion zone arround the strain nominal value?
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