I'm a certified scale calibration technician and you hit every point right on the nose. Your video is awesome and u do a fantastic job explaining everything so simply. Thank you for the info on integration.

It's incredible how my electronics courses introduce a topic, and you immediately produce a super informative video on it. Good stuff. Thanks a lot!

For me this was one of your best presentations. Who says you can't teach an old dog new tricks? Well done Scott, I'm ready to build a super sensitive scale.

Greatscott:"fullbridge" Electroboom in my head:"FULL BRIDGE RECTIFIER" fucking hell it's not even a joke anymore im suffering.

I know I've probably commented this before, but I absolutely love your handwriting. So clean and precise, just like your explanations.

The moment when GreatScott uploads a new Video and you think ,,fck this shit, i watch the Video and after that i make my homework" xD

Impeccable timing :D Just as I'm working on a project with load cells! Loving your stuff!

Fascinating. I've used strain gauges many times before in my work (mechanical design engineer) but never fully understood their operation....now I do. Thank you.

I assume you speak not only English but your default language as well. That already makes you so much smarter than me. Then of course the knowledge you have gained in math and electronics, that you share with us, is a grand thing. THANK YOU!

Haaa!!! "Strain gauge" was the word I was looking for!!!! I'm a french speaking guy and I only know "load cell" but this is now what I was looking for. Thank you so much for sharing this beautifully made video. Alex from Québec, Canada

Thanks for this great video. I think you saved me weeks of trial and error for a project I'm doing. Excellent channel!

I really like your basics videos, this gives an essential introduction to the topic without getting into too many details. I think a good future topic would be filtering and signal processing, like basic analogic and digital filters. I think of only one suggestion for this video, in the part were you show the data stream and the difference between the weightless measurements and the weight of one IC, you could have used the Arduino Serial Plotter function to better display the difference, this is available in the later versions of the IDE, although it still needs some improvement.

Great GreatScott, great video as always. Have a great day! Salutes from ELECTRONOOBS

I couldn't weight to watch! There was very little strain in loading that info into my gray matter cells. I feel smarter already! Thank you.

Your videos have always been aspiring me to learn about new stuff which I have only learned about but never got hands-on experience. And I really wonder what kind of people are those who dislike your videos. Your work is great and I learn a lot. :)

When you are thinking about a new project with a load cell , and Great Scott upload an awesome video about it ;) Great content as always, thanks for your work

*Rider rolling down the road nicely* *Rider goes over a bump causing temporary lift rider* *Strain gauge erroneously senses rider no longer on longboard* *System brakes longboard* *Riders momentum causes him to faceplant*

I’ve been watching for years...just realized you are a Lefty. Your penmanship is amazing. My papers always end up snugged.

This is exactly the video I needed. I have also purchased such a load cell and HX711 breakout board. Now I understand how it works. I thought the load cell would use piezoelectric crystals instead of strain gauges, how wrong I was.

A lot of this I dont understand because Im just starting out with electrical stuff, but dang you really are a good teacher and are super smart! We all appreciate every upload you provide and the time it takes to edit each video!

I really like your content try to keep up the good work im 14 and im in electronics more than 3 years, almost all stuff i know i learned from you thank you ;-)

excellent job explaining the differences between quarter, half, 3-quarter, and full bridge, and why they can help in various situations. Just what I needed!

OH THANK YOU! If you do more engineering esque instrumentation videos, you will gain an entire college of followers, I promise you.

Again an amazing video ! I wish I had a colleague like you at work.

Very cool! Thanks for sharing with us!

Thanks so much! I just got a broken Wii fit board with 4 load cells in the bottom. This video is really going to help me use them.

Sir this was just awesome...just used the standard theories of standard wheatstone bridge,differential amplifier and a whole lots more and you converted to a real sensitive stuff!!!!! THIS WAS JUST AWESOME....I can now take different standard weights and can make a pretty decent weight machine using your theory you just showed!!! Thanks a lot Sir

Wow, what a wonderfully artistic and useful explanation!

I just learned about strain gauges the other day from my Electrical Trade Theory subject, so I understood the entire episode :D

For the adventurous: You can make an instrumentation amplifier out of normal low noise op-amps, then use oversampling + dither to get > 10-bit depth out of the ATmega SAR ADC. Feeding the whetstone bridge with a well regulated source, as well as making sure to air float (dead bug) your instrumentation amp is critical. (At these levels, merely the ambient moisture in the air condensing and re-evaporating on a PCB can cause variations in output. Professional systems use guard rings for this reason.)

Omg im so excited about new electric longboard video!!

I like your beautiful handwriting and information. Very Very good.

Fantastic! My query got just answered in minutes! professional video and speech, thanks!

Your videos are very educating and informing.

Bro i almost gave up at making a eboard you really motevated me and helped me thanks

I knew bout straing guages already, but this video was still hella informative and interesting.. thank you again for af great video From a fellow electronics dude, and cheers from Denmark :-)

You are a amazing human,,,,great great job ,,,I got lots of knowledge from this video about weight measuring

Very insightful. Thank you for this wonderful content.

very precise and concentrated explanation . THANK YOU

Last week I bought loadcells and the circuit to experiment - and this week you publish a video. Is this some mind reading you do? ;) As always, great video, thanks for producing it.

Nice. We use strain gauges in car crash tests. To compensate for the temperature, we use another strain gauge on the metal base. And the connection is then in a half bridge, as in the video.

I took apart my kitchen scale and was utterly confused on how it works. Now i know thanks :-D

The moment you measured weight of this small uC was truly amazing, thanks for great video :)

You really awesome , I learned a lot for your channel , keep the good work & good luck , looking forward for you future projects & lectures .

Another great video from +GreatScott!

I have donated u it wasn't much but thanks for ur help it helped me a lot in my hobby

awesome as always....i enjoy your videos everytime and my love for electronics keep on increasing thanks to u

When you see greatscott just upload a new video i was like oh sh*t gotta watch this before i sleeep

Amazing I fall in love with electronics.

Looking forward to seeing that new improved longboard :)

Hello @greatscott, you can add the 4 strain gauges directly to the skateboard TRUCKS. it will measure the deflection of the metal.

This is what we did in my engineering instrumentation class this term!

Good work.. keep it up.. thanks for your time and efforts.. I had to use once this load cells a few year ago. HX711 works fine with arduino.. even for smaller weight changes.. but callibration was too Much messy..

Because of Greatscott .. I still think Electronics is easy

Really great done! Fantastic explanation. Thank you!

This is what ive been tryin to search for so long haha..

I would have thought of a more mechanical approach for the long board weight sensor application. But I was not aware this technology existed and I think it is an interesting way to do it.

Great vide, keep up the good work 👍🏻 I would love to see some more longboard improvement videos 😁 and some hub motors maybe? Cheers

So I recently had to deal with a load cell in my project and having some troubles with it due to something I got wrong in this video I wanted to point out something: 1)at 6:29 you show using the green wire for A- and the white wire for A+ and that could work on some models but some times is the other way around, I've found people saying the opposite and some stating that sometimes the colors are not standard. 2) This is pretty simple but make sure to have some space under the side with the downward arrow with the weight marker, the measuring is done based on the fact that under stress the load cell bends a tiny amount that stretches the Strain Gauge changing the resistance (it's simple but it's something that shouldn't be left out in my opinion), mine had m4 screws and m5 screws and the m5 ones were the ones I had to use to secure it while the others were dedicated to the load; great video as always, I just wanted to share my limited experience to maybe help out a bit.

u deserve the best teacher award... are u a university professor ? if yes tell me ... I want to become ur pupil....

Fantastic description

very very good video. Sehr gute Arbeit!

Back to work Greatscott

In my DIY longobard desing I´ve used a button on a remote control which you have to hold if you want to ride, if you release this button my longboard will start braking slightly. However this load cell is so fancy :D

Another great video. Thank you for sharing this.

Why stop at using the strain gauge as a safety device only? Ditch the remote and use multiple gauges and calculate how your weight is distributed on the board. More forward, speed up, more to the back slow down.

good., you are really the great great great Scott! my biggest doubt was cleared thanks for making this video bro 😁

Nice explanation for newbies....

One way to overcome the noise is to sample the output of the HX711 over a period of time (say, 1 second) and average all of the samples. It's quick and dirty but would give you less noisy output and over several sample cycles the measured mass will be more accurate. (Probably why I always see digital scales change their output reading in time-discrete chunks, and it keeps changing for several sample cycles for a bit before settling.)

Good video GreatScott!😀

The moment when GreatScott uploads a new Video and you think "Holy shit, that's exactly what I'm researching right now!" Thanks, Electronics Obama for making my effort redundant...

Awesome video!

Oh no i missed your video while makeing a 555 timer circui. P.s. it worked on the end😁😁.

Hi, I was wondering if there was a reason you picked the resistor value of 120 ohms for the wheatstone bridge, even though the strain gauge who used had a nominal resistance of 350 ohms?

I was wondering how those things worked when fixing a scale, now I know!

Something to consider when using strain gauges or load cells is their orientation. I worked on a project that used a load cell to measure load from a cable, but the orientation of the load cell would change the measurement. That's because of the effect of gravity on the cell, the housing, the cable... I had to incorporate an additional accelerometer and use that to offset the measurement depending on its orientation.

Im a kid. I learned this better than math at school. Edit: Please do a DIY Or Buy for Function Generators

Love it !! Keep produceing more faster :-) Btw is this you main job ? Or do you do sth else ?

I love your electronic basics. It is actually basic

Hello GreatScott! I am currently working on a longboard of my own and I would know how you attached the strain gauge on yours. Keep up the good work.

Great video, as always. But it would be better if you yoused the serial Plotter to visualize the incoming data from the arduino :)

Great video! That was the best explanation of the underlying principles of the HX711 compared to the other videos. I had a question... What would happen if I supply 3.3v instead of 5v? With reference to your video, it'd certainly have an effect on the step resolution (correct me if I'm wrong!) but would there be any others alongside?

Diy realtime gps tracker project with intergated google maps or such would be awesome.

Great video .

thank you over & over for you very helpful content

excelente tus videos saludos desde Colombia.

Super Video! Hat mir sehr geholfen.

Thanks for the great video, What is the maximum output voltage value at maximum load in a load cell (if the supply voltage is 5V)?

Thank you very much for the educational video.

Did you know that the Arduino IDE can plot printed serial values? That would have been very useful for this video.

Hi GreatScott, i was wondering if we can measure variation of voltage directly on the HX711 with a voltagemeter. thx for the vid

im building a pair of diy speakers but im getting lost on how to choose the right components for my freaquency crossover. And i cant seem to find a desent guide on how. so please, can you do a electronics basics on that topic? Love your vids btw.

Could you cover industrial load cells and amplifiers such as span, zero, drift and the effects of hitting one so as to change its original values

thanx for providing this good show

LOVE IT. Today I will go to bed a 14 bit less ignorant :D thank you!

Amazing video! Thank you. Will this sensor work in tension as configured? Or will it only measure compression?

Very nice explantion! 👍

Note, we use a Wheatstone Bridge because is very precise but the principle of the voltage divider would work

The longboard is back! Is the quadcopter next?

I want videos on this longboard! 😂