Questions tagged [rotary]

Characterized by circular movement around an axis, as opposed to linear movement along a line.

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21
votes
12answers
12k views

Is there something such as an infinite potentiometer?

I am trying to find a component, that, similar to a potentiometer, delivers an analog output, but which can be turned indefinitely in a single direction. I have tried searching for something like this,...
11
votes
4answers
55k views

How can I spin an old HDD motor?

I've stripped out an old IDE (40 Pin) HDD from 1998 for use in a POV display project (Gr. 12 Computer Engineering), and I've been trying to spin it up. The problem is that the HDD motor is brushless ...
9
votes
1answer
7k views

Rotary Encoder Detents

I've seen rotary encoders that you can get with and without detents (example). What are detents in the context of rotary encoders? When would you want / need your encoder to include this feature in a ...
8
votes
8answers
7k views

How to provide power to a rotating circuit? [duplicate]

I want to build something with my unused fan. I am planning to put a lighting circuit using LEDs and a microcontroller (ATmega, Arduino Nano, or something), thus creating some kind of image from the ...
7
votes
2answers
1k views

What type of encoder is this (optical, magnetic, inductive… etc)? and how does it operate?

I have found this circuit mounted to a DC motor. It is probably an encoder but I don't know how it works. I have looked everywhere but I could not find a similar encoder assuming that this is in fact ...
6
votes
3answers
2k views

Decoding multiple quadrature rotary encoders

Scenario I have 4 ACZ16 quadrature rotary encoders connected to GPIO Port D on an ATMega168P. I am only trying to extract rotation direction from them. Position is irrelevant, and it is guaranteed ...
5
votes
1answer
391 views

What is masking-time and chattering in rotary encoders?

In the datasheet of these encoders there is always a chapter mentioning masking-time and chattering. I couldn't find any tutorial on this. What are these definitions about?
4
votes
1answer
1k views

KY-040 rotary middle push button switch is unreliable

I have the following rotary encoder with a built in push switch: http://henrysbench.capnfatz.com/henrys-bench/arduino-sensors-and-input/keyes-ky-040-arduino-rotary-encoder-user-manual/ I connect the ...
3
votes
3answers
914 views

Help to understand incremental rotary encoders

I have this encoder. But I'm having extreme difficulty understand how these encoders work. I tried to google but still cannot picture in my mind how they really work. I spend two days for research ...
3
votes
2answers
6k views

What is the use case difference/benefit of using a Gray code vs. Incremental rotary encoder

I am planning to build a small digital project where a rotary encoder would be ideal for sending "up/down signals" (e.g. scrolling through a list on screen). Are there any benefits of using a Gray ...
3
votes
1answer
14k views

STM32 Rotary Encoder with Hardware Interrupts

I'm trying to get a rotary encoder working on my STM32. I have channel A & B being pulled up to 3V and debounced with 1uF capacitors. The board has channel A & B connected to PA11 & PA10 ...
3
votes
2answers
173 views

Small rotary switch

I'm looking for a small rotary switch but don't know the terminology to find what I'm looking for. To be honest I'm not sure they make what I'm looking for. The closest I have found is this, a rotary ...
3
votes
2answers
1k views

Help me identify this rotary encoder [closed]

I need help identifying this 360 degree rotary encoder on my Roland SC-880 rack synthesizer. This one has become 'jumpy' and Roland claims the part is discontinued. So my only choice is to replace it. ...
2
votes
5answers
8k views

Interfacing multiple rotary encoders to a microcontroller

What, in your opinion, would be the most efficient way to interface muptiple (let's say, >20) incremental rotary encoders to GPIO-limited microcontroller (for example, ATxmega128A4U, 44 pin)? ...
2
votes
3answers
262 views

Rotary switch to turn LEDs on cumulatively

Problem: I have a 12 position rotary switch and 11 LEDs that I want to switch on one after the other until they are all on (on pos 12). Limitations: It would be easy to use a μC, but I wanted to keep ...
2
votes
1answer
5k views

STM32: Timer encoder reset

I configured my TIM4 as encoder input and everything is working well when I execute TIM_GetCounter(TIM4) But I would like to put the timer value back to 0 (reset?) when I press a push button with an ...
2
votes
3answers
805 views

Where to place debouncing circuit for remote mounted buttons and rotary encoders

I have an application where a push button and mechanical grey-code rotary encoder(user inputs) need to mounted away from main pcb. 24" - 48" away. This is for space and packaging reasons. Is it OK to ...
2
votes
1answer
105 views

Motorized rotary switch

Motorized potentiometers are easy to find and often used e.g. in music studio equipment, but I could need a similarly motorized rotary switch for a project. I am either searching for the wrong term (...
2
votes
2answers
2k views

Rotating components in Altium Designer, clearance

I can't find out how to properly rotate 45 degrees components in Altium Designer. I read two topics about that: Rotated component placement in Altium How can I rotate a part in Altium without an ...
2
votes
3answers
93 views

Optic encoder - Rotation

In the following you can see the channel A ( above ) and the Channel B ( middle) output of an optic encoder that is connected on a rotating shaft. My questions is: Does the impulse width impact the ...
2
votes
2answers
192 views

Toggle battery powered LEDs

I am helping to build a costume prop that has four LEDs lights on it (1 white and 3 amber). This device is worn on the wrist, so space for power is limited- a 9V battery or something that will fit in ...
2
votes
1answer
1k views

How to calculate RPM, given timer frequency and counter on STM32

on my STM32F103, I use a timer to read rotary encoder Prescaler = 71 Period = 20 Clock = 72MHz Rotary encoder: 2000 ppr Given the formula: TIMUpdateFrequency(Hz)=Clock/((PSC−1)∗(Period−1)) I ...
2
votes
1answer
245 views

Rotary Encoders

I am trying to find a replacement for an obsolete encoder. I thought I had found a good replacement, hiwever the unit increments up when turned both ways, instead of up for right and down for left. ...
2
votes
1answer
384 views

Rotary switch that changes resistance on each click?

I am trying to create controller for my car head unit as it lacks a volume knob amongst other things. I have worked out that when tapping onto the control pin I can "send" commands by applying a ...
2
votes
0answers
30 views

Three-phase rotary converter wiring questions

I am installing a 30 HP three-phase rotary converter on a 200 amp service in my home shop. I intend to run a CNC milling machine with a 15 HP motor. I am using 2 AWG wiring in 1" shielded conduit ...
1
vote
8answers
2k views

Can rotary encoders be multiplexed?

I am currently working on a MIDI based project and would like to use rotary encoders. However, due to the nature of my project I need to multiplex a total of 64 encoders with 8:1 multiplexers. Is ...
1
vote
3answers
120 views

Determine angular position from two potentiometers

I am trying to generate a continuous angle based on the output of the two potentiometers that are inside my device. The pots are shifted by 180 degrees and are capable of spinning continuously. How ...
1
vote
3answers
761 views

SPI: MOSI not dropping LOW for receiving device

I hope this question is not a repeat of others on this stack exchange concerning SPI. I've been searching for at least an hour and have not found the same problem/answer. SCENARIO My friends and I ...
1
vote
1answer
366 views

How exactly do 1950's rotary phones receive phone calls? [closed]

What happens start to finish. For example, how does the signal get from the central office to the phone and what mechanisms within the phone move to signal that a phone call is coming?
1
vote
4answers
1k views

Combine signals from two rotary incremental encoders to one output

There is some device controlled by (optical) rotary incremental encoder (which gives quadrature output - two channels with square shaped pulses and shifted between each other). I want to add another ...
1
vote
3answers
406 views

Identifying this part - ALPS 242N Probably a rotary encoder

This was damaged in shipping. Looking it over I THINK it's a rotary encoder. ALPS seems to have forgotten they ever made the part. Printed on the back is ALPS 242N. Can't find any specs on it. ...
1
vote
6answers
281 views

Accurate sensor for a rotating object

I have a square-shaped plastic plate (3 cm length X 3 cm width X 1.5 cm height) attached to a motor that rotates it at 500 Hz: I would like to have an interrupt fired on my microcontroller every time ...
1
vote
5answers
2k views

Telling which way a KY-040 Rotary Encoder has been turned

I am stripping this problem down to the bare minimum. I have KY-040 Rotary Encode, When it is turned clockwise I want a blue LED to blink for every increment it is turned. When it is turned anti ...
1
vote
3answers
4k views

Rotary encoder to 2 buttons

Please excuse me if this question is a very obvious one, I have searched on here but my electronics knowledge is very very basic. Here's what I'm trying to do, I have taken an old Android phone ...
1
vote
1answer
269 views

How to reliably sample a sensor during the rotation of a wheel in a car?

I would like to sample the acceleration of the wheel axis (vertically and left-right) N times per rotation (for example once per spoke, but not necessarily). The data would be processed with Arduino. ...
1
vote
2answers
518 views

Two phase frequency doubling a rotary encoder

I have a 600ppr quadrature encoder that I would like to get the highest possible resolution out of. I need sub arc/second accuracy for my project. I saw differential Manchester encoding as a solution ...
1
vote
3answers
78 views

Question based on rotary potentiometer and resolution

Can anyone help me how to come up with this question's solution? Question: A rotary potentiometer consists of a fine wire wound on a circular former, whose inner diameter is 2.5 cm. The resolution in ...
1
vote
1answer
55 views

Reading a rotary encoder using a microcontroller and converting to Serial TTL?

I have an incremental rotary encoder (Bournes-EMS22Q) that I would like to have available on a wired network via RJ45 or via serial TTL (we have a serial-to-ethernet converter we can use Netburner ...
1
vote
1answer
72 views

Scrolling wheel encoder with button push button action into wheel axis

I am looking for a wheel that you can push into as a button as well as scroll indefinitely in either direction. Here's the exact part I am talking about. I'm not sure exactly what it is called. The ...
1
vote
1answer
171 views

How would I use a rotary encoder without housing?

I'm looking to buy a rotary encoder and I've stumbled upon this: which I assume is an encoder stripped of its housing. My question is how would I use it? There is no shaft to turn, so I'm assuming I ...
1
vote
2answers
328 views

Necessary Read Frequency vs PPR of Rotary Encoder

I am working on a microcontroller (ATMega328) project where I am planning to use a rotary encoder. I plan to have a non-time critical main loop and set up a timer interrupt to handle reading the ...
1
vote
1answer
148 views

Rotary Decoder circuit for high PPR Encoders

I am working on a project that uses a rotary encoder, I am using a locally made encoder of 200 PPR(pulses per revolution), The encoder has 2 inputs wires (0-5 volts) and 2 output wires (output pulses)...
1
vote
1answer
68 views

Rotary Sensor Potentiometer SP280X series

I have a novatechnik rotary sensor potentiometer SP2801 100 002 001.Th datasheet shows that it has a maximum electrical angle of 100 degree.But I saw that we can move the pot in any direction any ...
1
vote
1answer
719 views

Changing the path of a signal through multiple transistors with a single-poled switch

I was wanting to construct a "fuzz" distortion guitar pedal, but being indecisive, I wanted to be able to change the type of transistors in the circuit at will. I found the idea of using a double-...
1
vote
1answer
3k views

Rotary Cam Switch wiring help

I am trying to wire this rotary cam switch to spin a DC motor forward and backwards based on the UP and DOWN setting. I am having a really hard time trying to figure out how to wire it. Can someone ...
1
vote
3answers
201 views

High resolution angular position (~0.5 degree) measurement [duplicate]

I am attempting to replace a light/mirror sensor to measure the slight low speed oscillations/ rotations of a disc over a period of time. I want to record the angular position, but I wanted to find a ...
1
vote
1answer
370 views

DIY rotary inverter technical and economical feasibility

I’m setting up a solar panel system (200W) that’s used to charge batteries that will power small appliances in a converted van. Solid state inverters are expensive and difficult to fix and it seems ...
1
vote
2answers
2k views

How to handle rotary encoder overflow

I am using a magnetic rotary encoder(AS5048B) to detect the rotation angle of a motor shaft. This is fed to a pid loop to calculate the PWM value for motor position control. The encoder has a 14Bit ...
1
vote
1answer
3k views

DIY Rotary Phase Converter with starter motor, cutout relay in parallel with load?

I am working on a DIY Rotary Phase converter with pony motor. This will use single phase 240v and run capacitors to feed 2 legs of a 3 phase motor, which will generate the 3rd leg. It uses a 1/2 HP ...
1
vote
0answers
39 views

Why does a rotating magnetic field's frequency decrease, if we increase number of poles (induction motor)?

I absolutely don't understand it and drives me crazy. I've found several sources, in which there are shown images and animations about how two or three phase electric current generate rotating ...