Tagged Questions

An encoder is a device, circuit, transducer, software program, algorithm or person that converts information from one format or code to another, for the purposes of standardization, speed, secrecy, security or compressions

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5
votes
3answers
171 views

What is the purpose of 8b/10b encoding?

In the physical layer of USB 3.0 there is an 8b/10b encoder. Wikipedia says that this eliminated DC offset, while the tutorial I am reading says it is a common encoding scheme in high-speed ...
1
vote
1answer
41 views

Can I use this rf module with HT12E and HT12D?

I have recently made RC car using HT12E and HT12D connected to a cheap ASK RF module of 433 MHz frequency,but it's range is not good only a few meters and also so prone to electrical noise generated ...
4
votes
1answer
67 views

What is the advantage of differential Manchester

I can see the advantage of Manchester code over NRZ: you get clock and data in one signal combined. But what does differential Manchester add to that?
3
votes
1answer
89 views

Optical linear encoder for motion tracking?

I need to find a cheap optical solution to measure the position of an object in relation to a surface. The object glides in a linear motion along an axis, around 30mm away from the surface. The ...
3
votes
1answer
113 views

What is this part? PN:R19F 2E

Mystery Encoder I think this is some sort of rotary encoder, but it doesn't seem to act like one (no quadrature output from the pins). Tests I've run: 5V input in each pin, monitoring the other ...
3
votes
2answers
188 views

FPGA encoder counter running away randomly

I am programming an Altera FPGA using Quartus II v9.0 to count encoder pulses and output that count to an external LabVIEW program (see diagram below). I was able to debug one issue with my code ...
0
votes
1answer
89 views

Quadrature counter on FPGA is running away

I am attempting to count pulses from a quadrature encoder in an Altera FPGA. I believe I have my counter set up correctly (circuit diagram below, following this tutorial), but when I turn my encoder ...
0
votes
2answers
98 views

What component (IC) to use for collecting A and !A signals into a single TTL signal?

I am building a circuit board to listen to quadrature encoder signals from a motor controller and send these signals on to an FPGA that will be used to count the pulses and direction. The signals ...
1
vote
1answer
80 views

RPM Measurement (rotary Encoder)

I am measuring Dc motor RPM using a rotary encoder(custom made).The input supply to the encoder is 3.3v and the encoder output(Sine wave) is given to the Schmitt trigger to get square shaped signal. I ...
-3
votes
1answer
88 views

4X2 Priority Encoder with priority I0>I2>I3>I1

I have to design a 4X2 priority encoder which has this priority (I0>I2>I3>I1). the problem is that the priority encoder concept is not very clear to me. I have googled but cant understand. Can anyone ...
1
vote
1answer
92 views

component to measure the passing of a striped string

Has anyone ever come across some sort of optical component that can count the stripes in a patterned string as the string is pulled through? Just curious if something like this exists or if the DIY ...
0
votes
1answer
87 views

How to implement a radial encoder with a diametrically magnetized magnet using a hall-effect sensor?

I want to implement a rotary encoder that doesn't use optical sensing or physical contacts. I found the following solution using a diametrically magnetized magnet on the shaft, and a dual axis hall ...
1
vote
2answers
80 views

Constructing an Encoder

I understand an Encoder is 2^n input lines and n output lines`. I want to construct an Encoder from scratch so I can understand how it works, so that I can construct any other Encoder in the future. ...
1
vote
0answers
112 views

Brushed DC motor with incremental encoder— How do I use it?

I have come across large brushed DC motor, a Dunkermotoren GR 53X30 with an incremental encoder attached. Here are the spec sheets for the motor and the encoder: ...
0
votes
2answers
85 views

Minimum tolerable signal to noise ratio in modern communication systems

What is the minimum tolerable SNR in today's (digital) communication systems for successful recovery of the message? I've heard that regular commercial systems can recover the message with a SNR as ...
2
votes
1answer
94 views

Wiring optical incremental encoder

I'm trying to connect an optical encoder (Bourns EN series) to AVR microcontroller, and a few things are not clear for me from the datasheet. At first, datasheet says that the maximum supply current ...
0
votes
1answer
84 views

Programmable Encoder, variable numbers of pulse/revolution!

Programmable Encoder, variable numbers of pulse/revolution! Hey everyone. I'm doing my final course work and I have a problem with an encoder. Well schematically I have to feedback a frequency ...
2
votes
1answer
150 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 ...
6
votes
2answers
362 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 ...
2
votes
2answers
202 views

Magnetic Encoders - Tips and Tricks

I am new to encoders in general and I am thinking about using a magnetic encoder in a personal project were I will need to make my own servo, and thus get an absolute position reading (instead of the ...
-1
votes
1answer
58 views

Using Motor Encoder with M8706

I am working on extracting encoder data from a dc motor (apparently a "Pitman"). The encoder is somewhere inside the casing and the only interface it has with the outside is through a 4 pin connector ...
2
votes
2answers
188 views

IR Reflectance Sensor for a Wheel Encoder - Analog or Digital?

I'm in the process of building wheel encoders for my robot and have come across 2 different IR Reflectance sensors. Analog Digital I'm trying to find out what the potential benefits or drawbacks ...
0
votes
2answers
424 views

continuous servo position control

with a continuous rotation servo i can control the direction and the speed of the servo , but i need to control the position too , i know it's not possible directly due to lake of feedback control in ...
0
votes
1answer
105 views

Building an 8 to 4 Encoder from a 8 to 4 Multiplexer?

I have a a 8-to-4 Multiplexer ICs (MM74hC4052N) and I want to use it as a 8-to-4 encoder or 8-to-3 encoder. Is that possible? If it is, can drop me some hints on how to do that? At one glance, I ...
0
votes
1answer
239 views

Identifying rotary encoder

I need help with identifying connection scheme of this rotary encoder. I have no datasheet and there is nothing specified on the body except "CTR".
1
vote
2answers
132 views

Termination of a convolutional encoder vs. state register reset

Usually, when designing a convolutional encoder for a transmitter, some sort of termination mechanism is applied to drive the encoder back to its zero-state after a message was transmitted. This is ...
0
votes
1answer
507 views

Incremental optical encoder output to Matlab Simulink

I'm doing a project based on an incremental encoder based position sensor. In order to validate this, I'm trying to read square wave signals from a function generator (since an optical encoder ...
1
vote
0answers
194 views

Forward Error Correction code, Reed Solomon, Turbo Code, Low-density parity-check

I am new to FEC (Forward Error Correction). Pointers highly appreciated. I am experimenting software with configurable "error protections". Result improving as setting raise to 40%. Still not ...
-6
votes
1answer
517 views

Is it possible to attach PNP counter to an NPN encoder? [closed]

As a follow-up of my previous too generic question I have a signal generator (shaft encoder) that has 2 NPN outputs. I have a high speed counter that needs PNP signals. How can I convert the encoder ...
2
votes
4answers
365 views

PIE vs Manchester Coding

Why is Manchester encoding preferred to PIE(Pulse Interval Encoding) for applications were data is transferred through inductive coupling? For transmission of data and power through wireless medium ...
1
vote
2answers
261 views

Avoiding false optical rotary encoder readings

I have an optical shaft encoder that has rather big resolution - 2500 pulses per rotation. The problem is that false pulses get registered from environmental vibrations - if I shake it in my hand or ...
1
vote
3answers
333 views

How to fake an encoder signal with one function generator?

I wish to be able to have a encoder quadrature signal that I could set the frequency to some specified values (from 10 to 60 Hz). I have a function gen that fulfills the freq requirements but it has ...
5
votes
4answers
2k views

Wheel encoder using an IR sensor

I made a rotary encoder using a IR sensor and a wheel with printed black and white spokes. Everything seems to work but I'm wondering if there is a better way to code this. The IR signal looks ...
1
vote
2answers
193 views

Simulate Encoder Using Buttons

I want to simulate a simple encoder wheel with two buttons (one for up and one for down). The output of the encoder is as follows: I want to accomplish this without the use of a micro. I have a ...
1
vote
1answer
102 views

HOA0901 Wheel Encoder Circuit

I am trying to use the wheel encoder mentioned in the circuit but somehow i can't manage to understand why there is a full voltage drop in the IR led and why the resistors are not limiting that ...
1
vote
2answers
520 views

Interfacing HEDS 9700 optical encoder with AVR atmega32

I'm trying to interface an HEDS 9700 optical encoder using an HCTL-2020 IC (or anything else) with my Atmega ( atmega128, atmega32, atmega16, atmega8 or any AVR-family based microcontroller, don't ...
3
votes
6answers
3k views

How to interface a quadrature encoder with PIC?

I'm developing a prototype that uses a quadrature encoder to measure it's linear displacement. The encoder is attached to the prototype body and has a wheel in it's shaft. As the prototype moves ...
4
votes
2answers
647 views

Do two encoders connected to a microcontroller interfere with each other?

I connected two AMT 103 rotary encoders (mounted on two separate DC motors) to a dspic30f4011 and read the values using interrupts (instead of qei as the dspic only has one). However, the error in the ...
5
votes
1answer
110 views

State of the art for turbo decoding

I am currently taking an online course on probabilistic graphical models. In the section on belief propagation (BP), specifically loopy BP, reference was made to Robert Mc Eliece's 1988 paper Turbo ...
7
votes
3answers
961 views

Using a LED to transmit data

I am curious about the possibilities offered by LEDs to transmit data over a short range (2 or 3 meters), and what maximum data transmission rate can be expected from carefully chosen, but ...
1
vote
2answers
154 views

What specification for IR communication to AV equipment?

I'd like to task a micro-controller to use it as a universal remote. What is the specification used for IR communication to AV equipment (TV's, etc.) and where can I find it?
2
votes
3answers
452 views

Motor controller software design

I have to design a PID controller for a differential drive robot. The hardware board consists of a AVR atmega168 running at 16mhz. Driven by two 24v scooter motors with 256 CPR encoders The motors ...
0
votes
2answers
264 views

Brushless Motor Encoder Read?

I have this a MegaMo SY3056 BLDC Spec.PDF And beside the cables that are connected to the ESC i have thses encoder cables: How can i read this encoder? and what values do i get? Can i know the ...
2
votes
4answers
764 views

Is there an IC for a 32:5 Encoder?

I need a part similar to a 74HC148 8:3 encoder, but which takes 32 input lines and encodes them to a 5 bit value. I can guarantee that only one of the 32 will be high at a time, so I don't even need ...
0
votes
4answers
735 views

Where to get stepper motor with integrated encoder

I'm looking for a stepper motor with an integrated high-resolution encoder for some force-feedback experimentation. Maybe something like this: http://www.opticalencoder.com/pdf/CM-300.pdf It need ...
20
votes
1answer
2k views

How does a ball mouse know the direction?

Foreach axis on a mechanical (ball) mouse there is an IR transmitter and receiver pair with a wheel that looks like having only simple slits. How is the direction calculated?
4
votes
1answer
289 views

Help to understand this encoder timer tick code

Could somebody please please help me understand the following code. Its running on atmega128 @ 16 Mhz. Its reading an encoder pulse. Uses timer3. The encoder CHA is connected to PIND2 (INT2) which ...
0
votes
6answers
2k views

Rotary encoders to ensure 2 wheel robot goes straight!

I have successfully counted the rotary encoders on the wheel of my robot so this is not a problem. My problem is what to do with this number. Basically, the bigger problem is that I need my robot to ...
1
vote
2answers
342 views

wheel encoder to find direction of wheel

I am doing an 8th semester project but I need to use an IR transmitter and receiver to find the wheel direction of car. I would like 8051 assembly level code to find wheel direction. I am using two IR ...
1
vote
4answers
263 views

Determine the position of a ball joint by image processing

I am wondering if it is possible to sense the position of a ball joint using: A photodiode array from an optical mouse, embedded in the socket A specific pattern deposited onto the ball A processor ...

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