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Author Topic: (Newb) Measuring Force  (Read 768 times)
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Hi I want to measure force using an Arduino Duemilanove. Right now I'm looking at a few piezoresistors,  thinking to wire them to the ADC. Any considerations I should keep in mind? Are there other more practical/accurate solutions around? 

Thanks for the help
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It very much depends on the application.   Load cells such as used in digital scales and digital kitchen scales are one route, and there's even a way of using a vibrating wire's resonant frequency to measure its tension.  A pressure guage can measure the force applied to a piston of known area too.  Another approach is to use a motor or actuator to resist the force - use position feedback to keep the motor stationary and the current it takes will be proportional (in principle) to that force - you might even be able to do this with a standard servo and a current-sensor.
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How much force?  Can the sensor be compliant (move, with more force causing more displacement), or does it need to have very little movement with applied force?
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Regards, Terry King terry@yourduino.com  - Check great prices, devices and Arduino-related boards at http://YourDuino.com
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Well, I'm actually trying to measure how much force I can get from servos for a plane I'm building. Under the current setup, the plane's tail will hit the piezoresistor vertically, and this in turn goes to the adc since I want to log all the information. My first thought was to go with the piezo right away, but now I will research everything you mentioned, Mark.

Terry, the servos output around 6 kg*cm. Like I said, since I'm just starting the research in order to build the test stand, pretty much everything goes.
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