What is Encoder: Definition and 29 Discussions

A rotary encoder, also called a shaft encoder, is an electro-mechanical device that converts the angular position or motion of a shaft or axle to analog or digital output signals.There are two main types of rotary encoder: absolute and incremental. The output of an absolute encoder indicates the current shaft position, making it an angle transducer. The output of an incremental encoder provides information about the motion of the shaft, which typically is processed elsewhere into information such as position, speed and distance.
Rotary encoders are used in a wide range of applications that require monitoring or control, or both, of mechanical systems, including industrial controls, robotics, photographic lenses, computer input devices such as optomechanical mice and trackballs, controlled stress rheometers, and rotating radar platforms.

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  1. Z

    Understand the Multi-party circuit: Priority Encoder

    Paper link is: MPCircuits: Optimized Circuit Generation for Secure Multi-Party Computation I have a question: What is the reason for using priority encode? The circuit diagram is given. I want to give some text from book: From the above text I want to understand why its a multi-party? It is...
  2. F

    Design a 4:2 priority encoder with active low and enable

    Homework Statement Design a 4-2 priority encoder with active low and enable. Homework EquationsThe Attempt at a Solution Here's my work , but I don't know how to connect the enable input. Any help would be greatly appreciated ! ##A = \overline{I2}+\overline{I3}##...
  3. F

    Rotation Measurment with Encoders

    I am trying to both design a code for Arduino and build a circuit connected with the Arduino which uses 3 anode 7 segment and 3 resistor arrays with 7 pins to connect to the Arduino Uno. The encoder is a rotary encoder. I have Pin A of the rotary encoder connected to pin 13 of the Arduino and...
  4. J

    Magnetic encoder signal processing

    I've been using DC motors with magnetic hall effect encoders on them to measure position control. It's basically a feedback servomotor system. i've so far been feeding the signal into my microcontroller's interrupts. This has been causing some problems with my timers and program. Let's say the...
  5. T

    What is the purpose of a rotary encoder?

    I apologize in advance if my post is in the wrong section. I'm writing a program to control a stepper motor. The motor came with a motion controller and an encoder. I'm not sure how the encoder should be used. I can program the controller to set the "zero/reference" point and tell the stepper...
  6. J

    Should I use a potentiometer or Quadrotor encoder?

    Specifications: Measuring angle from -90 to + 90 degs. Low friction Low moment of inertia Requires high speed Accuracy about 1° degree. Needs to be durable, handle mechanical vibration I use a dc motor as an actuator, this is a custom built servo. This is a very small device, and the encoder...
  7. M

    Tracking Encoder and Component Slippage

    Trying to identify a method of improving angular repeat-ability and reliability of our measurement devices. The way this will be done, is by doing research and utilize an alternative form of measurement and detection. This method will involves adding a sensor to the existing fixtures and...
  8. B

    Can I acquire the shaft position of my motor using my VFD

    The project I am working on is to design the control system for a shock dynamometer. I am using Labview and communicating to the VFD using Modbus. The shock dyno will look a little something like this; So one of the main objectives in my project is to produce a plot as seen below; The...
  9. S

    Debouncing rotary encoder circuits

    Hi, In this Raspberry Pipboy Project, Niel Corbett attempted to recreate the pip boy as a real life functional device, and in this project he is using two rotary encoders. Here' the link to the code for his project...
  10. Weightofananvil

    How to Handle Data from a Motor Encoder with C in Arduino?

    Hi Everyone, I'm coding an circuit in arduino that reads a sensor to gauge a motors RPM. I have the arduino reading the speed and blinking an LED. Now I need some way of taking that data reading it for say half a second, perform calculations to double the count (to make it per minute) send the...
  11. M

    How to install Adobe Encoder on Mac

    Hi PF! I am trying to install Adobe Encoder on my mac, OS 10.10.5 Yosemite. When I go to their website here http://www.adobe.com/support/downloads/thankyou.jsp?ftpID=5940&fileID=5969 and download it and try to open it MATLAB attempts to open it. How should I install this? On a related note, I...
  12. Rx7man

    Detecting Missing Teeth on a 60-1 Encoder Wheel with an Arduino

    I am at a bit of a loss at how to deal with the logic of a 60-1 or 60-2 (60 tooth wheel missing 1 or 2 teeth as an indicator of position) read by a VR sensor. I'm currently employing an Arduino, though later I may change platform.. I can have the sensor on an interrupt, but how do I detect...
  13. S

    Help finding a rotary encoder with interupt capabilities

    In this project, https://bitbucket.org/selectnone/raspipboy/src/73553033cfbc7c0a88f10332b8d09aa259a6b375/arduino/pipboyControls/pipboyControls.ino?at=master&fileviewer=file-view-default 14 // Change these pin numbers to the pins connected to your encoder. 15 // Best Performance: both pins have...
  14. C

    What is the protocol used for the Panasonic incremental encoder?

    I have a Panasonic servo motor( model no.MSME 102GCGM), this motor comes with an encoder installed and a drive. I am learning motor control, so i need to do the drive myself with dSPACE system and to do that I need the encoder signal as feedback, however the encoder output signal is not ABZ...
  15. A

    Incremental rotary encoder motor help

    Homework Statement Hi please see the image that I have attached. The text colored in red is the data I need to calculate. Homework EquationsThe Attempt at a Solution The encoder has 128 counts per revolution So to calculate corresponding angle change this I what I did I divided encoder count...
  16. F

    Create a logic circut with encoder in multisim (adder/subtractor)

    hello how can i use full adder with encoder in multisim to add and Subtract two decimal number and create it
  17. K

    Designing priority encoder with 4-16 decoder and 8-1 MUX

    Homework Statement Design a 4 input priority encoder with a 4 to 16 decoder and a 8 to 1 multiplexer. Homework Equations Priority encoder is where when the highest priority bit is equal to a logical "1", then the rest of the lower priority input are ignored.The Attempt at a Solution For the...
  18. T

    Incremental Encoder Question

    So I've been trying to read up a little on incremental encoders and have been looking at the outputted signals typically labeled A and B. These signals are 90 degrees out of phase. Apparently, the purpose of having both of these signals is for identifying motor direction. However, I'm kind of...
  19. F

    Boolean logic priority encoder

    Hello, I need to design a circuit (3-bit priority encoder) whereby: - if input X =1, then outputs B1=1, B0=1 - if inputs X=0, Y=1, then outputs B1=1, B0=0 - if inputs X=0, Y=0, Z=1 then outputs B1=0, B2=1 - if all 3 inputs = 0, then outputs B1=0, B0=0 Would this be the correct way to...
  20. J

    Connecting Quadrature Encoder to Single-Ended Channel: Advice

    I have one quadrature encoder with A- A+ and B- B+ Signal, but my driver is a single-ended encoder channel? Can i just connect either the A+ and B+ or A_ and B- signal to the single-ended encoder channel? Please advise. Thanks
  21. J

    Optical incremental encoder

    I was given the following question "An optical incremental encoder that produces 1,000 pulses per revolution is connected to the shaft of a motor. Determine the angular resolution of the encoder in degrees and the motor speed in RPM, if the encoder outputs 5,000 pulses in 1 second." I am...
  22. B

    Could a High Temperature Absolute Encoder Fill a Niche Market?

    Hi, as part of a project I needed a slim (<10mm) small diameter (<30mm) through hole absolute encoder that works at 100 degC. I wanted this to be able to determine a motorized valve position, so it needed to slip onto the gearbox output shaft between the motor and the valve. Anyway, I...
  23. K

    Finding a Motor with an Absolute Encoder for Angular Position Detection

    Hi all. For a project I am doing, I need to find a motor with an encoder that we can use to detect the exact angular position of the shaft at any given point in time. I'd like to see if there is any motor out there with absolute feedback from the encoder - i.e., that I would be able to read...
  24. M

    Rotary Encoder Pulses to DC voltage

    Does anybody know a good way to take the pulses from a rotary encoder and turn them into a DC voltage that would go up for clockwise turning and down for counterclockwise turning? I have the A and B pulses from the encoder, and that's about it as of yet. I also have these chips...
  25. E

    Shaft Encoder with Pulleys/spring/spool

    Alright I am trying to measure the "instantaneous" velocity of a swimmer at around 400Hz. I plan on attaching the swimmer to some nylon rope or something similar and having the rope go into a "box" that will use pulleys, a wheel mounted to a shaft and shaft encoder that will rotate freely...
  26. R

    Help with Exam Question on Optical Position Encoder

    Hello everyone, I have an exam in a few days and need help with a question on one of the past exam papers. An optical position encoder used on a robot axis has a 10:1 gear ratio, an optical disc with 72 slits, and a 12 bit binary counter. Determine: (i) The resolution of the encoder i.e...
  27. E

    Why? question about optical encoder

    Why is the outermost ring of an optical encoder the least significant bit? Is this somehow related to frequency?
  28. N

    Which IC Can Be Used for Encoder Counters?

    i am want to make circuit that use an encoder counters.. but i don't know which ic can counter for encoder?? i am using 74LS47 for encoder counters?but, it didn't work?? is 74LS47 can use for counter encoders?? which IC can used for encoder counters?? thanks anyway
  29. W

    Design BCD 2-out-5 Encoder Using Logic Gates - 74210 Code

    Can anyone please help with the design of a BCD 2 out of 5 encoder (74210 code) using basic logic gates :smile:
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