Strain gauge installation and demonstration
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- Опубликовано: 14 сен 2020
- In this video I show how to install a strain gauge to the surface of a metal bar. Then, I demonstrate the change of the resistance of it upon deformation first with a multimeter, then through my circuit and software.
My circuit can be seen in the previous video in this topic:
• 4 channel strain gauge...
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I found the circuit diagram on the following website: www.elecrow.com/strain-gauge-...
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Great experiment. Never opened my scale but I thought the strain gauges needed to be attached in a more complicated way, that's great.
Thanks! Not, it is "just glued" to the surface. Of course, they might use different glues, but cyanoacrylate glues are usually perfectly fine for the purpose. When they are used in load cells, they are attached in a bit more complex way in a sense, that they are installed to a certain geometry with a certain alignment. In load cells, it is often that there are 4 strain gauges are used.
Excellent tutorial. Thank you for uploading.
Thank you! Cheers!
Great detailed video. Thanks for posting it.
Glad you liked it! Cheers!
Great video. Thank you very much.
Glad you liked it!
Great video ! Thanks
Thank you! Glad you liked it!
Excellent tutorial. I’d like to use something like this to measure the torque of an auger drive for screw piling.
Thanks! I hope your project goes well!
Awesome !
Thank you!
Great video sir love from Pakistan
Thank you! I am glad you liked it! Best wishes from Sweden!
Nice 👍
Thanks ✌
What is the built-in module you use (the one at 2:45)? I have developed my own circuit making a Wheatstone bridge and using an instrumental amplifier, but just because I wasn't aware of the existence of these kinds of built-in solutions. This seems to simplify the matter a lot!
Hi! It is on my website under the parts and tools section.
good explanation... but may you show how do you connect that small circuit to the bar? I don't get it
Thank you!
Great video. I am wondering why don’t you use hx711 with 3 constant resistors to establish a Wheatstone bridge.
Hi! I cannot offset the signal with the HX711, and I cannot measure fast. The HX711 can only measure up to 80 samples/s. Also, the amplifier circuit comes with a built-in Wheatstone bridge.
@@CuriousScientist
So, is this module capable of measuring strain gauges for dynamic and impact experiments? What’s the best amplifier for this kind of experiments?
It is capable yes. For dynamic experiments, you just need a fast and high resolution ADC such as the ads1256. I don't know which is the *best* as I haven't tested too many yet.
@@CuriousScientist Thanks for your reply. What about load cells, can I hook it to this module? I mean load cell is a full Wheatstone bridge which means that we don’t need the built-in resistors. I built similar data logger with hx711 modules and three resistors attached to the output to make the Wheatstone bridge. Thus, I can read strain gauges and loadcell at the same time. However, I am looking for an upgrade to read at higher sampling rate for dynamic testing.
Load cells will not work with this module. I think you haven't watched the video carefully enough, but I specifically talked about this. This is a strain gauge amplifier with a built-in Wheatstone bridge.
How accurate are these strain guages? Could they possibly be used to measure the expansion of a metal tube over the course of an evening as the temperature outside changes?
Definitely! In fact, if you want to use the strain gauges properly, you have to install them in a way that they cancel out the thermal expansion. The unit used for strain gauges is usually expressed in "microstrain" because the change that you can resolve with them "does not make sense" in "strain" units. It is just too small to use the regular strain units.
Very good video! I would like to know whatever is the graphics software used. Is this graphics software available?
Thank you! This whatever software is written by me. It is not available for free.
thank you sir, if i may ask. how do i know the amplifier gain that used in the module?
You are welcome! Either you check the schematics of the amplifier and calculate it or measure the voltage at the input and the output of the amplifier and figure it out from the proportions. If I am not wrong, the LM358-based circuit has a 2-stage amplification, first with ~50x gain which is followed by another ~25x gain stage.
hello, thanks for this video. So, I have a strain gauge with amplifier connected to the Arduino circuit. i am able to read some numbers from the strain gague but it's not the forces or the mass. do you know how i can make Arduino convert whatever the strain gauge is reading to mass?
Hi! I think you don't understand how strain gauges work. Check my video, so you will understand more about them: ruclips.net/video/FWRiSIqF3f8/видео.html
In order to convert the readings into weight, you need to be able to convert the voltage into strain, then you need to convert the strain into force/stress (hint: Hooke's law).
@@CuriousScientist thank you! The video is helpful. I am aware of the process, but i am not sure how to implement that into Arduino.
You're welcome! Well, it is quite a lengthy process to explain it in the comments. But you can get the ideas from my videos.
@@CuriousScientist will do! Thank you.
This might be a silly question, but would apply a strain gauge like this work on curved surfaces? Like for example, a bowl?
Absolutely doable! They do it with pipes, rods...etc in the industry which are also curved. And there are no silly questions! :)
@@CuriousScientist thankyouuu for your reply and nice explanations :D
If I may ask.. Could it be used in universal testing machine (UTM) and measure the strain of material under testing of UTM?
Yes, but keep in mind that these gauges can only measure up to ~2% strain.
Thanks for the video!!!
I found a loadcell for scales has 5strain gauge. Could u explain how can we connect all of them or schema. Thatnk you!!!!!
I have no idea what kind of load cell you are talking about. It is impossible to say anything without seeing it. It's like telling the car mechanic that you have a yellow car and it is broken, can he fix it?
@@CuriousScientist ok I ll send you the pic
I dont have ur email
My email address is really easy to find. But keep in mind that I am not a free support service.
How would I connect multiple strain gauges on the metal bar in a wheatstone configuration? Thanks!
Hi! Just Google it. You'll find pictures of it.
thank you very much....please can you tell me when i find the software that you are used ..and how you connect computer?? thank you again
Hi! That is my own custom software I wrote. It is not available.
@@CuriousScientist i have Arduino can i use it instead of ads /??
Yes and no. The Arduino has built in AD converter, however it is nowhere near as good as the ADS1256. I would not use it for strain gauges.
@@CuriousScientist thank you so much you helpful ...can you show me the guide to get similar software i am civil engineering not familiar with electronic.. thank you again
Yes, watch my videos. I have so many videos dedicated to ADS1256. I also have some where I use the ADS1115.
I have a load cell with strain gauges attached to the top and bottom, but the wires have been removed. How can I tell which of the "pads" go to which of the wires? It is hard to tell from your video because my strain gauges are different.
It's hard to tell from your description which connections you should use because there are several different strain gauge patterns. I am not a magician to guess your strain gauge. You can look up Omega Engineering's catalog and find your strain gauge and the relevant information.
@@CuriousScientist Yeah, I thought I would find one like mine and put a link here. I still cannot find a similar strain gauge. I might send an email with a pic to Omega. Thanks.
You can send a mail to me too.
@@CuriousScientist OK. Tomorrow. Thank You!
is there a simple way to convert the voltage from the module to strain? i found no data sheet nor formular for this module. still nice video
Sure! Check this video: ruclips.net/video/8Zsw3RApkVA/видео.html
@@CuriousScientist thanks 👍
I have a question: If he has a ruler made of aluminum or iron, should I clean the ruler with 80 grains of silicon carbide before applying strain?
It is always advised to clean the surface.
@@CuriousScientist What is the nominal resistance of type 402? Which is written |||IFSR_||||18|||
Sorry, I have no idea what that is based on your description.
Does this software communicate directly with the STM32 board?
Hi! Yes it does through the serial port.
Hello, how can i find the rate of deformation for strain gauge when it undergoes a consistent deformation and thank you
Hi! The rate is the time derivative of the strain.
@@CuriousScientist how can I measure the strain of gauge from voltage difference?
Watch my strain gauge videos, I explained it very carefully.
Hi. What is the name of that amplifier?
Hi! It is an LM358D if you meant the OPAMP.
hello sorry, would there be any way to access the code used in arduino?
Hi! Yes, check my website and other RUclips videos.
@@CuriousScientist thank you
Soldering is not sticking to leads of strain gauge. What to do?
Make sure you use flux. Also, you need to heat _both_ the solder tab and the wire. If the tab is cold, the solder will not stick to it.
@@CuriousScientist thank you so much, I am able to do soldering as per your guidance!!
@@girishpanchal9072 Super, I am really happy for you! Now you also learned a new skill! Have fun!
Glue.??
Glue. What else?