Strain gauge installation and demonstration

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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.co...
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Опубликовано:

1 окт 2024

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Комментарии : 92

@isidoromaich7226 4 года назад

Great experiment. Never opened my scale but I thought the strain gauges needed to be attached in a more complicated way, that's great.

@CuriousScientist 4 года назад

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.

@c13.12t 4 месяца назад

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

@CuriousScientist 4 месяца назад

Sure! Check this video: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-8Zsw3RApkVA.html

@c13.12t 4 месяца назад

@@CuriousScientist thanks 👍

@JulenCS-u1e 5 месяцев назад

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!

@CuriousScientist 5 месяцев назад

Hi! It is on my website under the parts and tools section.

@MethiasZa 3 года назад

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?

@CuriousScientist 3 года назад

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.

@ciksumurni2429 2 года назад

good explanation... but may you show how do you connect that small circuit to the bar? I don't get it

@CuriousScientist 2 года назад

Thank you!

@EsraAbay200 9 месяцев назад

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?

@CuriousScientist 9 месяцев назад

It is always advised to clean the surface.

@EsraAbay200 9 месяцев назад

@@CuriousScientist What is the nominal resistance of type 402? Which is written |||IFSR_||||18|||

@CuriousScientist 9 месяцев назад

Sorry, I have no idea what that is based on your description.

@CuriousCat-yl8by 3 года назад

This might be a silly question, but would apply a strain gauge like this work on curved surfaces? Like for example, a bowl?

@CuriousScientist 3 года назад

Absolutely doable! They do it with pipes, rods...etc in the industry which are also curved. And there are no silly questions! :)

@CuriousCat-yl8by 3 года назад

@@CuriousScientist thankyouuu for your reply and nice explanations :D

@cigetotpgs1998 3 года назад

thank you sir, if i may ask. how do i know the amplifier gain that used in the module?

@CuriousScientist 3 года назад

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.

@ahmedalkhairo7651 3 года назад

Great video. I am wondering why don’t you use hx711 with 3 constant resistors to establish a Wheatstone bridge.

@CuriousScientist 3 года назад

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.

@ahmedalkhairo7651 3 года назад

@@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?

@CuriousScientist 3 года назад

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.

@ahmedalkhairo7651 3 года назад

@@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.

@CuriousScientist 3 года назад

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.

@neonk3655 2 года назад

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?

@CuriousScientist 2 года назад

Hi! I think you don't understand how strain gauges work. Check my video, so you will understand more about them: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-FWRiSIqF3f8.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).

@neonk3655 2 года назад

@@CuriousScientist thank you! The video is helpful. I am aware of the process, but i am not sure how to implement that into Arduino.

@CuriousScientist 2 года назад

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.

@neonk3655 2 года назад

@@CuriousScientist will do! Thank you.

@VidarrKerr 6 месяцев назад

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.

@CuriousScientist 6 месяцев назад

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.

@VidarrKerr 5 месяцев назад

@@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.

@CuriousScientist 5 месяцев назад

You can send a mail to me too.

@VidarrKerr 5 месяцев назад

@@CuriousScientist OK. Tomorrow. Thank You!

@markmaker2488 6 месяцев назад

Excellent tutorial. I’d like to use something like this to measure the torque of an auger drive for screw piling.

@CuriousScientist 6 месяцев назад

Thanks! I hope your project goes well!

@goosegoinggone Год назад

How would I connect multiple strain gauges on the metal bar in a wheatstone configuration? Thanks!

@CuriousScientist Год назад

Hi! Just Google it. You'll find pictures of it.

@muhammedlatifbekci7725 3 года назад

Great video. Thank you very much.

@CuriousScientist 3 года назад

Glad you liked it!

@waltermota9169 2 года назад

Very good video! I would like to know whatever is the graphics software used. Is this graphics software available?

@CuriousScientist 2 года назад

Thank you! This whatever software is written by me. It is not available for free.

@roselv.babalcon8720 3 года назад

If I may ask.. Could it be used in universal testing machine (UTM) and measure the strain of material under testing of UTM?

@CuriousScientist 3 года назад

Yes, but keep in mind that these gauges can only measure up to ~2% strain.

@waltermota9169 2 года назад

Does this software communicate directly with the STM32 board?

@CuriousScientist 2 года назад

Hi! Yes it does through the serial port.

@fatimafatima-oc7dz 3 года назад

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

@CuriousScientist 3 года назад

Hi! That is my own custom software I wrote. It is not available.

@fatimafatima-oc7dz 3 года назад

@@CuriousScientist i have Arduino can i use it instead of ads /??

@CuriousScientist 3 года назад

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.

@fatimafatima-oc7dz 3 года назад

@@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

@CuriousScientist 3 года назад

Yes, watch my videos. I have so many videos dedicated to ADS1256. I also have some where I use the ADS1115.

@user-uk8ji5mw2v Год назад

Hello, how can i find the rate of deformation for strain gauge when it undergoes a consistent deformation and thank you

@CuriousScientist Год назад

Hi! The rate is the time derivative of the strain.

@user-uk8ji5mw2v Год назад

@@CuriousScientist how can I measure the strain of gauge from voltage difference?

@CuriousScientist Год назад

Watch my strain gauge videos, I explained it very carefully.

@tanjerincupcake 2 года назад

hello sorry, would there be any way to access the code used in arduino?

@CuriousScientist 2 года назад

Hi! Yes, check my website and other RU-vid videos.

@tanjerincupcake 2 года назад

@@CuriousScientist thank you

@mikephilmelendez 2 года назад

Hi. What is the name of that amplifier?

@CuriousScientist 2 года назад

Hi! It is an LM358D if you meant the OPAMP.

@girishpanchal9072 Год назад

Soldering is not sticking to leads of strain gauge. What to do?

@CuriousScientist Год назад

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.

@girishpanchal9072 Год назад

@@CuriousScientist thank you so much, I am able to do soldering as per your guidance!!

@CuriousScientist Год назад

@@girishpanchal9072 Super, I am really happy for you! Now you also learned a new skill! Have fun!

@Mkhayra 3 года назад

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!!!!!

@CuriousScientist 3 года назад

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?

@Mkhayra 3 года назад

@@CuriousScientist ok I ll send you the pic

@Mkhayra 3 года назад

I dont have ur email

@CuriousScientist 3 года назад

My email address is really easy to find. But keep in mind that I am not a free support service.