Measuring the output of strain gauges
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- Опубліковано 19 вер 2020
- In this video I show you what are the challenges of measuring the tiny changes in the resistance of a strain gauge. The resistance of an unloaded strain gauge is around 350 Ohm (at least the one I use in this video) and a loaded one's is 1-2 Ohms smaller or larger. This is a small change, it is difficult to measure it and it is even more difficult when it is a change in the resistance of something. To make this value into a more comprehensive one, I use a Wheatstone bridge to convert the change in the resistance into a change in voltage. The obtained voltage change is still tiny (few tens of microvolts), therefore I use the built-in PGA (Programmable Gain Amplifier) of an ADS1256 AD converter to resolve this tiny change.
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Thanks for this.. seeing you work with a breadboard made me confident in not needing the strain gauge manufacturers ridiculously expensive amplifier for testing while making our own..
Great video! I just ordered a kit online for 4x half-bridge strain gauges that can be connected with HX711 to Arduino. My question is, your video shows only 2 wires for each strain gauge. The kit shows 3 wires coming out of each strain gauge... is that because it contains 2 strain gauges in each sensor (one in compression and one in tension configuration) to double the output voltage difference?
hi, thnaks for your video. it is really nice. how did you oder your 350 ohms resistor ? i found 330 ohms but not 350 ohms ? have you a seller reference ? thanks in advance
Thankyouuu for this :D Have you ever worked with a mems sensor system in any project? That would be a really cool video
I have a basic understanding of this having done some electronics in night college. Maybe this is a dumb question as I don't know much about strain gauges. Is the voltage output linear? If put 1 ounce of weight on a strain gauge and see 1 mv will I see 2 mv if I put 2 ounces of weight on the strain gauge. I'm trying to picture how a digital scale uses a strain gauge. Thank you.
Hi,, the module you showed containing the bridge and opamp, found it online , is there a point on having different nominal resistance strain gauges ? if yes do you reckon i can use this module with another strain gauge ?
Hello,
Hello, how was done the treatment of the raw value data obtained with the strain gauges to get the strain?
Hi Curious Scientist,
Thank you for this
How about wire? please could you tell me what kind of wire you are using, if give the link like other parts will be very good?
Can you recommend a pletier?
Did you get drift if you held a static load? I did this with an hx711 ADC and it seems to drift upwards noticeably overnight. This is very linear and im thinking of using this ADC instead.
would it be possible to built a small wearable application of a strain gauge that can sense and react to small strain changes? A device about an inch wide and 6 inches long and 1/2 inch thick?
Hi, how did you go about calibrating the strain gauge? What testing standards are you referencing?
where did you get the strain gauges?
hi! can you please tell me what software u re using in 11,29, and what materials u used to connect voltage circuit please ? last question please
Is there any limitation to the length of the leads going to the gauge? In my situation I would like to have somewhere between 6 to 9 feet. Would there be any problem with that? Thanks
*PLZ HELP*. Given a pressure of 2kpa, nominal resistance of 120 ohm, diameter of strain gauge 0.1mm, a GF of 2. What will be the change in resistance value of the strain gauge?....in short I wanta formula to calculate the change in resistance of strain gauge for a given INPUT PRESSURE
where did you get the arduino code?