HACKED!: Using an HDD Motor as a Rotary Encoder?!
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- เผยแพร่เมื่อ 5 พ.ค. 2024
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In this episode of HACKED! we will have a closer look at the BLDC Motor of a hard drive. We will find out how it works and how we can use its construction to determine whether it spins clockwise or anticlockwise. At the end we will connect the Motor to an Arduino in order to use it as a rotary encoder.
Music:
2011 Lookalike by Bartlebeats
Killing Time, Kevin MacLeod
(incompetech.com) - วิทยาศาสตร์และเทคโนโลยี
"simple schematics"
yeah, I thought the same thing... " *yeah, sure.... pretty simple* "
koncepto I totally know what you mean. But a few weeks ago I downloaded an app called icircuit for a work project. I’ve only made basic circuits with motors and lights before now so had no hope I could use it. I googled how to reverse polarity (for the project) and it showed me a circuit like GreatScott’s so I copied it to the software and made a mock up circuit for my project. Then I looked on ebay for the components in the diagram and they are just 8 pin chips and a few resistors. I’ve learned in the last few weeks it looks much scarier on a schematic to what the product in your hand will be
@michel777ification How many times has it got you laid? Loads i'm guessing
I thought the same
Now you have made a turntable. Let's DJ
You are doing an awesome job , the videos are very informative , beginner friendly and you also answer most of the questions in the comments . The ads on your videos are short and not promoting useless stuff . Thanks for being such a nice creator .
Thanks for the feedback
I don't mind the adds as long as the content is good and the adds are short and relavent to the content....
Thanks. From a brush less quadcopter & drone enthusiast that recently learned about rotors encoders while trying to build a PID gas burner control for my work. I may try this in the future. Good work with your videos informative and enjoyable
Great idea !
I think you can improve it a little. You can only use L1 and L2 to determine the direction of rotation. At Low to High transition of L1 check the state of L2, if it is High the it turns clockwise else it turn anticlockwise (or vice versa).
ممكن مساعده بمقابل مادي
Thanks for another year full of awesome projects!
Cant wait for the upcoming episodes of 2018 :)
Thanks for the feedback. I will give it my best in 2018 as well.
You mean 12018?
+redstone craft guy i saw what you did there
Yeah , i also.
Hope you hit 1M subs in 2018.
Great video as usual. You could use the analog voltage generated to determine how fast the motor is spinning and thus make it a velocity controlled rotary encoder so that the faster you spin the more you change the output number.
This has got to be one of the best videos I have seen. It is clear, concise, and informative. I have disassembled hard drives for parts, also to ensure the information on the platters is destroyed but to use the motor as an encoder didn't cross my mind. Thank you for sharing.
I was looking for a way to make a rotary encoder from a HDD motor but found your instruction very interesting and easy to understand. Thanks and keep em coming.
I’m an Electrical Engineer and yet I learn something on every one of these.
Plus I love his pronunciation of hysteresis.
Making a dj turntable from this might be good...🤔
I am about to try this
you can use the midi keyboard project of evan kale, and simple add this to control some programs
Would be awesome, but it seems like the platter needs quite a lot of rotation for the value to change. =/
Dear Scott. During my journey into learning electronics, I've used your videos a lot and I have learned a lot. This video might make me actually start my Disc Jockey from scratch idea. The encoder is exactly what im looking for to make one for my DJ setup and its been a rather dumb little goal of mine to build a working one. Something similar to a CDJ-2000 from Pioneer, just cheap and not at all packed with features lol.
Glad to be one of your many Patreaon supporters! Great video and great topic. I also learned about another source of three phase power for some of my projects. thanks again: I will definitely do this project.
Hi Scott, cool projects (as always); I was thinking that this could be taken to the next level where the rotation speed and acceleration would increment/decrement the value faster. Also, maybe keeping it connected to the analog inputs would allow to measure the amplitude, which is proportional to the speed. Great work! Stay cretive & I'll see you next time!
Indeed. If I would have the needed skill, I'd try to implement this for my DIY small arcade cabinet. That HDD motor would surely indeed have very satisfying feel cause if it's good bearings.
Indeed. It's a hall effect rotary encoder.
@@user-xf9ny8qf3s There are no hall effect sensors in his hard drive motor. He relies on measuring the voltage resulting from induction while spinning the it. In effect it is acting as a 3 phase generator. What you are referring to would be a sensored BLDC motor. You can make a much better encoder from a CD rom drive spindle motor that is sensored (has hall effect sensors). That is a totally different principal than what he is showing here. Instead of tapping into the coils, you would tap into the hall sensors directly.
@@Enigma758 I mean that's how hall effect sensor works.
@@user-xf9ny8qf3s I mean that in the video, it is imprecise due to the fact that induction depends on motor speed. Many who have tried it complain about that and they are correct. Using hall effect sensors in a sensored motor totally avoids that problem.
Man I'm so much big fan of urs... I really like all video🔥🔥🔥
Thank you :-)
Another excellent, Excellent, EXCELLENT video. I have been watching your videos for a while and the are great! Your ability to take mammoth amounts of information and condense it into a few sentences is incredible. The questions you ask (and subsequently answer) are all the right questions. It reminds me of the awesome old Mythbusters episodes. Can't wait to see what you bring us in 2018!!!
I'm going to refer back to this video for my sensorless bldc motor experiments. I tried to breadboard a circuit a couple of years ago but I could only make the bldc spin like a stepper motor. It would only run smoothly after it reached a certain speed. It had no useful torque because I did not know how to set up the comparators.
I'm not going to hack a hdd motor but the information in this video is absolutely useful. Thank you!
what is the minimum velocity you'd need to turn it, so that it works? I guess it is a lot higher than with the incremental rotary encoder?
What's hell, thumbs down!!!!!!!?
This channel give us soo much great content how come someone rate it down; the guy put a lot of effort to make this understandable, at least appreciate the effort of the man.
Great content as always
TH-cam is full of psycho trolls who will thumb down even without watching.
Don't bother about them they never understand anything in this video and never will.....
Don’t bother less than 1 percent disliked
Personally I am slightly dissatisfied by the fact he uses the motor, not the actual harddrive hardware as the encoder.
The software people, who actually thought it was a software hack.
You really rock man. Keep on creating great contents like usual.... I would like to know more about your background. You use elettronics with extreme confidence making complicate things looking simple. Amazing!
Man I did electronics 27 years ago usind avos and old oscilloscope, in college but this is amazing stuff.. You have rekindled my love of electronics, and computers I used to build my own pc towers... Great information totally within the ability of novices having watched you tutorial, can't thank you enough. Rob👍👍👍
Seems to be exactly how modern graphics engines work... Could be useful to try and battle online network clans.
You're my favorite creator. I can't wait to see what's coming up next. Almost always a learning experience. ESPECIALLY when you do mosfets and IGBT ;) I don't think we get enough examples of arduino and pi "real world interfaces". how about some home appliance hacking with an esp8266 and mqtt ?
Look at KanKun wifi smart plugs!
They come loaded with BusyBox linux with an SSH terminal open! you can hack them and make them do whatever! really fun!
For quite a while I’ve thought about starting a website that would work like a hackers search engine, you type in rotary encoder, and it spits out an everyday object where you can get one, in this example, a hard drive. same with the magnets.
good idea!
Great! Thank you. I've got a collection of motors of all sorts. Some are like this one, and I now understand how I can make use of it.
That could make a cool input for so many projects. Finally a use for the dozens of old HDD parts I've collected.
Very clever application, thank you for the wonderfully detailed explanation (as always). Shouldn't it be possible to use only two of the motor phases? Instead of being ~90 degrees phase shifted (as in standard quadrature type rotary encoders) the two outputs would be ~120 degree phase shifted.
yup, im pretty sure we can. Since most incremental rotary encoders actually use 2 signals only.
Can you make it spin by itself at low-torque while still remaining the ability to work as encoder? That would make nice DJ controller, since most controllers do not spin by themselves as vinyl deck does.
The control system would be a lot more complicated, but brushless DC motor drivers do something like that to monitor the rotation of the motor as it's driven. While power is applied between 2 phases on the motor, the 3rd is watched to observe rotation.
Awesome stuff. Here's to another good year of great content! Also, loved the first pronunciation of rotary - 'rotawee' 👍😁
The best video ever from great Scott, this one beats everything you ever published. Kudos
One like for the motor sacrificed.
I have two questions about this project:
1) why is using the analog read not good?
2) is there a way to speed up the counting? When you spun it fast the numbers went up slowely
1) Typically you want to use analogue to digital converters for something else like sensors since a micro controller usually has only a few of them
1) Because your Arduino might not measure the the phases at the right time because it is currently doing something else in the code. That is why interrupts are so important.
2) Yes, you can enhance the code quite a bit and add more functions like counting up according to the rotation speed.
Aah that makes a lot of sense! Thanks for clearing it up, keep up the great content
Analog to digital converters are generally slow and takes up more processor time. ISR and digital comparisons usually take lot less CPU time. ( Edit: Also you could use the ADC for something else instead of wasting it on a rotary encoder)
And I think it can be sped up by tweaking the code
1) I guess using the adc is less effective than just reading a digital value
2) decrease the delay (7:48)
We can increase the resolution by a factor of 3 by using interrupt on each of the 3 inputs.
The global position counter is incremented/decremented by each interrupt.
Such amazing video production. Perfect lighting. He's called GreatScott for a reason.
ur amazing electrical engineer. do u teach?
Is it possible to increase sensitivity of the encoder?
+GreenMC If you put more time into the code you can even let the Arduino react according to the speed of rotation. So, yes.
hey, your first again!
Trust me, this is going to be mentioned a few more times in the comments... :/
would it be possible to see a video on that? Specifically, it'd be awesome to see the motor inside a case, maybe even with a small 3d-printed knob.
Yep. Sensitivity to small input is what actually will make it interesting.
This is awesome. I have a couple old VCR heads I've considered doing the same to. Never considered 2 of the phases would reverse depending on direction. Time to take a look....
That was a very lovely simple explanation.
I've always wondered this, would love to see some Arduino code to turn it into a HID master volume control.
You can use digispark, or standart Arduino with serial, but with soft on pc
you help me continoue my electronics thanks!
GreatScott! I really like your videos,i learn something new everyday from watching you,you my friend is a true inspiration without a doubt! Also Happy New Year to you GreatScott! We love your channel bro! Keep it up! 😄🖒
2017 ends with this good project.... keep making videos they are the knowledge junction for me... One place to learn a lot in electronics....👌👌👍👍☺☺
Ohhh I have a collection of motors here (all sizes and power levels) thaaanks for the inspiration... rotary encoder POWEEEEEERRR hahaaa =]
POWEEERRRR!! bahAHHahHa
Heeeyy!!!!!
I also have motors mostly brushed
Make it so if you spin it faster it changes faster
Why this only popped up on my feed today will be a mystery lost to the ages, however, its run in is impeccable, ill be using this in a super budget project within six weeks!!! Thanks @GreatScott
Hi,
Only 2 outputs from compactor can be used, same way as in rotary encoder. On every interrupt just check state of one phase, and you have instant direction. Also you can start timer in INT, and read it in another, so you have rotation speed, without using processor.
And finally use third coil to add force feed back to user. Also is possible to use multiple coils to provide sound, vibration, steps, lock, etc... I think that this could be very interesting, and relatively simple to implement in hardware.
Thank you for your videos, and keep up with good work.
A video about a volume control with rotary encoder would be great!
razvan_wasd you don't need to use encoder to do volume control. Encoder is used to measure quantitive measurements like distance, RPM
Evan Kale did this with an Dvd Drive Motor. Pretty cool Check out his Channel
You are too good Scott, I love watching you work.
This is interesting. I have quite a few of the motors from old hard drives. I might be able to make use of them now. Thanks.
Scot the DJ
So you just made electric fidget spinner
Lexa9966 fuck no its not a fidget spinner
how to delte others posts
flag as spam/inappropriate
@@samsawesomeminecraft OKAY I'D SAY IT'S VERY INAPPROPRIATE! LET ME FLAG..
Nicely done!
HDD motors are good fun to play with, i'll have to mess around with one using your circuit and code thanks :)
Oh and good job on the advert, it's rare that youtube ad's are useful
Awesome! am not suggesting that I will be stripping down my HDDs for their motors anytime soon, but I AM impatiently waiting for one of them to stop working. Thanks for this video and have a very happy new year!
This is probably better used as a rotational speed sensor
especially as the signal levels rise as the speed rises
Great idea but I don't know if there is a law between the output voltage of the motor and the speed, and if it is Linear
@@robbielerenne594 That's irrelevant. All you need is a Schmitt trigger and a quiet signal path to it (a wee bit of coax will do it). On the other side you're counting pulses just like a normal encoder.
Your arduino will quite happily play frequency counter (or more likely - frequency timer) and tell you how fast you're turning it as long as there's enough signal to set off the Schmitt trigger (so maybe not 0.02 rpm :P). Connect two windings to the arduino (separate inputs) and you can also tell which way it's going.
@@robbielerenne594 Also, yes there is and no, it's not. What you've got there is essentially a fairly inefficient (compared to purpose-built units) three phase permanent magnet synchronous generator. Y'ain't gettin' power out of 'er, but you'll get enough AC on the other end to run some high impedance logic (see last comment).
You also want to make sure the arduino itself is well protected from the motor. These are sizeable inductors near some skookum magnets and unless you're willing to splash on a good scope and spend a few evenings testing the thing to death I would NOT count on that signal being too weak to damage your inputs. Send it into something high impedance, make sure it's not something that will short its input to its output lines when it fails, and count the pulses ;)
Also, do NOT connect a 2.2mF electrolytic cap to the 5V regulated output of your arduino with no current limiting :D
That's one useful fidget spinner...
Not so Spicy Meme, Boi.
Happy new year, great video as always!
It's possible to get an instantaneous position by magnetizing the coils with a short pulses. For example, using your ESC, pulse each coil combination with a short pulse (just to avoid much heating) and note the comparator outputs on the 'scope. By measuring the decay times, you can actually translate the position accurately.
It might also be cool to make some sort of enhanced magnetic detent / user feedback this way as well. This probably wouldn't work very well for something that has to not take too much power, though, without some sort of sleep state.
GreatScott: *makes super easy to understand circuit and code*
Me: Wow! That’s sup-
GreatScott: EXTERNAL INTERRUPTS
How is your English so good? Mine is under all pig.
Haha, I would not say that my English is that good but you learn a lot after 4 years of producing english videos.
lmao
Was about to search how to use hard drive motors and stumbled on this one.. You really are the best greatscott
I had a couple of harddisks laying around and I was hating the idea of throwing those motors, thank you so much for the idea. I might use them for some project. :-)
One question. Why did you upload a video on Saturday instead of the usual Sunday?
Because I and probably other people as well have other things to do on the 31.12.
GreatScott! Would you consider to add an indipendent monitor to your cheap usb microscope using a raspberry pi (maybe the zero version)..
sorry for the OT
GreatScott! didn't you build a firing system for fireworks some time ago? Have fun!
my other thing to do is to get shitfaced and cry about my life on a hill i know til newyear comes
MCA sounds funny
It is funny how you say that you will see us next time that we don’t ever see you and you never see us.
Great stuff, I have some of these from taking old drives apart and never got to tinker with them.
3-input scope!!? Clearly I need an upgrade...
Love your videos - they are inspirational content, clarity and production.
Great video! However... You only need two of the phases. Typical encoders operate in quadrature or 90 degrees. Yours operates in tritrature? or 3 phase. Wasteful. Also, no detectable output at very slow rotation. On a normal encoder, connect both outputs to an XOR gate and you double the pulses per rotation. Connect phase one to the clock pin of a 74HC74 D flip flop and the phase 2 to the D input. Now the Q output will indicate direction and the XOR gate output gives you finer resolution steps. This little bit of hardware "preprocessing" will free up the highly precious processing time in your microcontroller. For actual useful purposes, never process hardware pulses in software. A processor using 98% of its processing time to read a switch is just plain wasteful.
Can you program Arduino wirelessly ?
I think so
Can you add this to your "To Do list"?
I am not interested in that. Google it. I bet there are plenty of tutorials about this out there.
You can do that over WiFi, BT or even with radio signals. It's all about creativity
Rajat Tarade I would REALLY like to know how to do this. I've looked into it (Google) but haven't figured it out. If anyone can point me I the right direction I would be VERY appreciative. Specifically I would like to be able to program an arduino from an Android device over Bluetooth.
I love watching your videos, you're so interesting! If only I had all of these to make your projects 😅
Another really great production. Thanks!!
Can you explain how three phase electricity works.Im talking about mains electricity.
I put it on my to do list
yeah, especially how watts are measured across three phases! - maybe even a BLDC 2 phase to 2 phase converter !
GreatScott! Specifically knowing how many generators started at different times and places can all be in phase supplying mains power
they will auto sync.
Ariel Lezen I think its one generator just with 3 coils like 3 phase motor. I could be wrong tho
Does JLCPcb ship to the UK?
I think so
I think they ship everywhere but china pretty much.
But shipping is pretty expesive. You will pay 2$ for PCBs and 9$ for cheapest shipping. So they obviously making money on shipping. But still worth it.
Ohm711 if you buy more than one shipping rarely changes
I am from Europe and shipping on my first order was 8.9$ via China post. Plus 2$ for PCBs.
Stumbled on this video trying to find out how to wire a hd motor, Man I wish i knew what you were talking about in the most sincere form, Should have gone to college and studied electrical/mechanical engineering. Thanks for what you do at the very least.Cheers
I really love all your content Scott!
I'm really a beginner with electronics and there are bits (or megabytes) of information that I miss.
I'm wondering, for me to understand these, as you call "simple" schematics, what are the principles that I must learn?
And, do you recommend any platform, site, webpage, youtube channel (yours maybe?) where I can find that information?
I'm an electrician and therefore got knowledge about certain circuits, but electronics exceed it.
Anyway, thanks for sharing your wisdom in such a comprehensive way, it's really a gift.
Sunday?
Next week!
Anyone watching in 2019?
Great Scott you are really creative !!!!
I think you are best on TH-cam for electronics with creativity !!
Thank you very much
Love your projects man, keep it up
wotawy encowdas
“Modor”
Tabi pek sağlıklı bir encoder değil,
Dönüş hızına ve süresine göre etki derecesi değişmekte.
Çok yavaş dönüşte enerji üretemeyeceği için sapmalar meydana gelir.
Ama çalışma mantığı açısından başarılı bir çalışma olmuş.
Teşekkürler dostum..
Necois Idois kanalın sahibi Türk değil farkındaysan
Burak Demirelli,
Kankam o benim. Alman.
Farkındayım tabi ki kardeşim.
Türkçe biliyormuki bu alman kardeşimiz.
Yiğit Alp Karakaş, yok sanmıyorum.
Ama Google Translate sağolsun ;)
:D
Mate, TH-cam is full of clever people coming up with clever ideas, based on previous clever ideas. Yours is magnificent. And really well explained too.
Thank you scott .i recently made wind speed sensor with the help of this tutoriel
German subtilels?
The community subtitle function is enabled. Feel free to add them.
Arm, das man einen deutschen youtuber nach deutschen untertiteln fragen muss 🙄
casemodder89 ich meine ob er deutsche Untertitel einblenden könnte in den Videos für damit die Leute die nicht so gut Englisch können auch mehr ferstehen
casemodder89 Aber besagter "deutscher TH-camr" macht englischen content - warum sollte er auch noch deutsche Untertitel hinzufügen? Die Mehrheit kann heute Englisch ohne Probleme verstehen (zudem ist das im Video verwendete wirklich extrem gut und einfach verständlich). Mit seiner Taktik spricht er einfach die größtmögliche Ziepgruppe mit kleinstmöglichen Aufwand an (obwohl der Aufwand der reinfließt immer noch immens ist...)
Rcmodellbau_DE ich ferstehe ja auch alles gut und er macht das echt gut es wäre nur so eine Idee für andere
i'ts CEOUNTERclockwaise
notheng persannel, guod veds as awlays
both are fine, what's the problem?
Anticlockwise (or anti-clockwise) is also correct. More common in British English than in American English.
* personal
how thick are you oskar
Almost as fat as your mother.
Thanks for posting this great video & explaining so much !!!
Thanks for sharing 😀👍, happy new year to you
Brilliant. I took one of these motors apart, but missed the fact that the outer ring which rotates has multipole permanent magnet, which then easily driven by the internal coils.
Awesome !! Thanks so much !! We all got zillions of such drives, stored in dark caves, and a-waiting the time we give them a second life. You restore hope ;-)
Incredibly neat work, a joy to watch!
One of the Best TH-cam Videos and Channels I've ever seen!!
lov u man...lov to all the commentetors.......every time u upload video...i watch few days later and all those remaining part get cleard in those coment...hi hi....keep up good work..
:)
You made my day as i really love all your videos.
Great Video very informative :)
Happy Holidays :)
Best Regards from El Salvador
Thanks Scott. I really enjoyed this video. Liked and subscribed.
Thanks a lot for this video. I have an old hdd and i didn't know what to do with it, but now i have awesome ideas. Thanks again😁😁
As usual, great content and great presentation from Great Scott, who is always GREAT!
A fun project would be to add some audio FeedBack for each 'tick' as when a key is tapped on a smart phone and then add a little 'KICK' with reverse voltage back into the phases to produce tactile FeedBack.
Again, GREAT vid.
Russ in NH
Hi, this could be made using a Taptic Engine from an iPhone/iPad.
This gave me so much joy to watch - I happen to have 3 HDD's waiting my deconstruction ;)
Great presentation Scott the way you explain is way better than my professors at College thank you
Great job. It's really inspirational. I think you could use those ADC pins of arduino to measure magnitude of three voltages and by that determine both direction and speed of rotation and have real rotational speed encoder.
Cool! I have done project where I had leds in a circle and turning hdd motor did light them sama dicrection as was the turn. Purely analog, just opamps and passive components.
Awesome! That's a really impressive "up-cycling" for a HD motor. I'll have to try it out too! :D
Wow! This is such a cool idea!
I seriously love your videos because every week you have a particular idea and no vlogging bullshit like "I recently bought some supercaps, expect a video about them next week..."! You even build things like the pov fan, etc. in a single video! So, thanks, man, for your videos!
What do you think of a project with some kind of laser projector? You probably would be easily able to build a crude oscilloscope because you built one out of the CRT-TV. I also liked the idea (I found on the internet) of moving the mirrors with a little speaker. Do you like such an idea?
Greetings, and a Happy New Year!