Potentiometer Conversion to 360° Continuous Rotation
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- Опубліковано 2 жов 2024
- This is a super easy way to convert your standard potentiometer into one that can spin 360°. Sometimes, I want a dial that can be used as a rotary encoder while also having the ability to provide absolute position. It's also nice for machines that need to remember their position without requiring power or memory.
Thanks for watching! Check out my over-engineered solution too:
• Absolute Position Enco...
A good li'l potentiometer kit:
amzn.to/3HNSTGZ
Oh my gosh, you're a life saver. I've been googling for continuous rotation/endless/360° potentiometers and wildly these seem impossible to find, or the few results that come up are staggeringly more expensive than simple pots. I can't believe something as simple as this isn't sold - that you for demonstrating how to DIY it!
You could use a stacked potentiometer, open it and then offset the traces by 90degrees. And have your mcu calculate the position by processing both analog levels.
You can spin it 360 but there a big dead band area where there isn't any conductive. It's more of a 330 degree potentiometer without. There are likely some applications where this sort of pot would be useful I wouldn't call it a 360 degree pot.
There are some low profile pots which don't have mechanical stops. These have the same dead band area. I've seen two low profile pots one on top of the other in order to eliminate the dead band. The low profile pots have an open center so one know can control both pots.
IMO, pots are the bane of robotic projects. Pots wear out. Whenever possible, I try to use encoders. Either quadrature encoders or magnetic encoders. Magnetic encoder don't lose their position information between power cycles but quadrature encoders need to zeroed some how if the absolute position is important.
Fair, it's not a 360 degree pot as much as it as a pot that CAN spin 360 degrees, haha. Can you provide a link to the low profile pots you're talking about? I'd love to see them.
Interesting input, I've never had an application where the pot gets enough use to wear out. I've been dying for some magnetic encoders from China to finally arrive, it seems to be the end-all of absolute position encoding.
Cheers :)
@@christophersfactory I think my comment which included links got blocked by UA-cam's spam filter. Here's the comment without the links:
I was harder to find the pot I was thinking about than I thought it would be. Apparently it's a rotation position sensor rather than a potentiometer.
Search for part # 3382G-1-103G on Mouser. It's manufactured by Bourns.
There are a variety of similar "sensors" but for some reason there's hard to find on Mouser and DigiKey right now. I've purchased these in the past so I was surprised to see how hard they are to find.
"I've never had an application where the pot gets enough use to wear out"
The main problem I've had is in servo of some of my hexapods. The movement of the servo slowly wears down the carbon film in the pot. Once the pot starts to wear out, the servo develops some jitter as certain positions (usually in position where the servo spends the most time). Once this jitter starts, it's a vicious feedback loop as the jitter causes the pot wear out even faster. I've burned out motors in a few servos from really abusing them but I lose way more servos to bad pots than I do to bad motors or electronics.
I've worn out a pots being used as a knob. I have a DIY oven controller and I've had to replace the pot a couple times.
The joycon drift which plagues many game controllers is often caused by the pots used in the joysticks wearing out.
I experimented with magnetic encoder about ten years ago (it's hard for be to believe it's been that long). Here's a link to one of my videos on the topic:
The title of the video is *MagneticEncoderDaisyChain120323a.AVI.* It shouldn't be hard to find on my channel.
The encoders I used require a SPI interface but they also make magnetic encoders which have the same sort of output as potentiometers. Many of the latest radio control transmitter use "Hall Effect" gimbals. These have the potentiometer type magnetic encoders.
(Add: Hopefully this comment isn't blocked.)
Dude I was trying to make a Knob and all the time I was getting suggestions like rotary incoder but I only had 1 pin left I had to be potentiometer finally saw your video and got to use it
Any why that in market we can get a remade version of this without dead zone
This video saves me a lot of hassles, unnecessary spending and time. What I have learned from this video is that one should never underestimate sharing any tips. However, simple or irrelevant it may seem, just share it. It will definitely help someone someday.
Thanks a lot
I discovered an issue after the modification. I used 100k, and the resistance increases beyond 100k when rotated through 360. Also, the resistance does not appear to vary linearly between 270 and 360.
I dont call this modified, I call it broken....and unreliable as coming off the track and over the pins is going to shorten the life of the wiper arm.