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Convert a unipolar stepper motor to bipolar
Thank you for posting this Instructable. It is appreciated. The very best
Built-in Headset on PlayStation 3 controller
Hi! My 2 channel oscilloscope finally arrived! It´s so small and cute! Ifollowed your steps but there´s something I didn´t get, they seem to becontrary to each other:Here you wrote that, for finding polarity on the opposite coils, you getthe polarity right when they´re 180 degree from one another.There are three options of what you are goingto see: Two lines will be in sync This essentially means you've found opposite coils that sit against each other, but you got the polarity of one of them backwards. Two lines are beating in the exact opposite directions This is the same thing, but this time you've figured the polarity right. Lines are slightly out of sync This means coils you are probing sit 90 degrees of each other. And here you wrote the opposite, saying that when they´re in sync it´sthe right polarity: Which one is right or what am I missing here?Now, put a Channel 1 of thescope on it in the polarity you've just guesstimated and Channel 2 to the coilthat is located on the opposite side of the motor against it in arbitrarypolarity. Spin the motor clockwise slightly. It is important to spin motor onlyin one direction to not to circumvent the testing conditions. If you seeabsolutely synchronous graph on the scope – you plugged the coil 2 in the samepolarity, means whatever your scope if connected to is the rightpolarity. If two graphs you are seeing are totally opposite – yourpolarity on scope channel 2 is backwards (not a bad thing). Andhere, to know the coils relative position to the left or right of the chosen Dcoil, you wrote about pictures #3 (they´re not there!). Choosing one arbitraryto be the C coil, you wrote about being 90 degress out of sync. You wrote aboutthe polarity being correct if the channel B (coil alleged C) comes before, thepolarity is right. But you don´t mention if C is left of A or right of A.Polarity is right means it´s left of your D?Now, you need to determine the relative locations of the side coils. Thatis, is the coil C on the left or on the right to coil D in my example.Determining it is quite easy: if you put a scope channel 1 on coil Awith respect to polarity you've determined and channel 2 on coil C in anarbitrary polarity you'll see a graph #3 from the pictures: two graphs are 90degrees out of sync. And here's the tricky part: if your channel 2 graph (theone with arbitrary polarities) comes BEFORE the channel 2 then you've got thepolarity right. If not – you got it backwards (again, not a bad thing).Sorry for so many doubts, but I didn´t getthe whole picture… yet! EhehehCheers, Rodrigo
Vibration triggers on PlayStation 3 Controller
You're absolutely right, DSO138 will not do it because it only has single channel. I am not aware of any tricks that can allow you to figure out a stepper pinout with just one channel since you need to measure coils simultaneously.Sorry for confusing you with DSO138, I have to stop posting comments on the go:-D
Hello!I advise you to get even the sh*ttiest scope you can get. It is about 20$ including shipping. If you into electronics even a little bit – get a scope. You may not know that you need it, but once you'll get it – you'll find yourself using it more and more.Check aliexpress for DSO138 DIY kit. It costs about 20$ and comes as a kit that you have to solder up yourself. Fun, right? And it is, well, a fully functional scope. A little noisy and not really fast, but hey, $20!It is quite easy to determine pinout of a stepper motor that has 4 or 6 leads, but for 8 lead stepper the only option I am aware of is the scope. Otherwise than that – you can guess the pinout, but it'l take you a looong time and is a very, very much frustrating task.
One note: never remove the rotor from the frame. It can demagnetize if pulled out. When you put it back again, it will be weak. Don't ask how I know.
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