Questions tagged [encoder]

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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96 views

Help understanding encoder

This circuit board is soldered at the back of a dc motor The motor has been removed and a magnetic disc is attached to the shaft and spins over these smd components. They seem to say A87L but I ...
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38 views

No. of comparators in Parallel ADC

I can't figure out why exactly the no. of comparators is (2^n)-1 in a parallel type ADC. The truth table (shown below) for a three bit priority encoder say that there must be at least one HIGH input ...
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72 views

What would be the difference between the output of a power bank and a laptop usb port? [closed]

I have an encoder which I have been successfully using when powered from my a USB2.0 outlet on my laptop. I need to be able to run it whilst disconnected from the laptop and so tried powering it from ...
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92 views

Rotary encoder sensor

Is there a way to get reading from rotary encoder without microcotroller? just simple circuit that count and increment, like op amp or 555 timer or logic gate . anything that u can help me .
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29 views

Can analogue Hall sensors be used in BLDC for static angle measurement?

Everything I have read on using Hall sensors with BLDC motors appears to use latching hall sensors which provide repeatable latching angles as the magnetic fields change at specific angles. I am ...
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1answer
40 views

What is the circuit's logic diagram of a (2-bit binary to decimal) encoder

To give a sense of what I am looking for ... this is a the circuit's logic diagram of a 4-bit binary to decimal encoder. Here is its truthtable Now, What is the circuit's logic diagram of a 2-bit ...
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2answers
53 views

Practical question on high resolution to composite/S-video

I read many resources on the internet talking about NTSC, PAL, timing and voltage levels. But I have specific practical question, and I can not find definite answer to it. There're very helpful posts ...
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1answer
53 views

Connecting luma only output to composite input

In the course of troubleshooting this problem I reconnected RCA connector connected to the RCA input of my TV to the luma wire of AD725 in hope having precise and beautiful grayscale picture, but got ...
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1answer
66 views

Non-systematic (7, 4) Hamming code encoder

I have to do the scheme of the non-systematic Hamming code encoder (not cyclic but classic). But I have not found any source where it would be written how to build a generating matrix and create a ...
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151 views

AD725: is it dot crawl - and what to do about it?

Device's datasheet says One well known distortion of composite video images is called dot crawl. It shows up as a moving dot pattern at the interface between two areas of different color. It is ...
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4answers
1k views

How to best clean this sealed mechanical rotary encoder / volume knob?

How can I best clean, replace or lubricate this fairly well sealed digital rotary mechanical encoder? The equipment operates, but the encoder is super finicky, often encoding in the wrong direction ...
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1answer
72 views

Two identical stepper motors behaving differently at higher (but below their rated) speeds

Note: My question might be short on specifics here when it comes to the motor-parameters, but I have been trying to understand a situation for the last 2~3 Weeks, and I still don't have an ...
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1answer
287 views

AD725ARZ wrong colors

I designed device based on AD725ARZ, datasheet is here. Device is built basing on the reference circuit diagram on page 12. TV is connected to composite output of the circuit. It does not have S-...
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91 views

How to make my own sequence of numbers and letters in a seven segment display circuit? [closed]

In this circuit, I have connected a single switch to a priority encoder, which is then connected to some inverters, further connected to a binary decoder, then to some current limiting resistor which ...
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2answers
132 views

HT12e: How is this a 2¹² encoder?

I am using HT12E, for a rf transmitter circuit. As per the datasheet HT12E is a 2¹² encoder. Ideally such an encoder must have 2¹² inputs and 12 outputs. In addition to that all the inputs should be ...
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avoid synthesizing priority encoder for onehot to binary conversion module

For https://github.com/jbush001/NyuziProcessor/blob/master/hardware/core/oh_to_idx.sv#L40 , why use OR operation to avoid synthesizing priority encoder ? if DIRECTION != "LSB0" and NUM_SIGNALS isn'...
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181 views

Anyone got these optical encoders working? [closed]

I got these Optical Encoders from a local vendor and connected it to my arduino in the following order; (+)----> 5v (-)---> Gnd (01)--->2 (02)--->3 But, it burnt and smoked out as soon as I ...
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145 views

Read Quadrature encoders over I2C bus

I need to add encoders to the 4 motors attached to a "remote" PCB. The remote PCB in question does not have microcontroller on it, but rather is connected to the microcontroller PCB with an I2C ...
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38 views

Decimal addition using a different BCD WEIGHTED CODING

The problem that I'm having trouble in understanding is how the addition of two decimal numbers such as 17 + 4 can be represented using the weighted BCD CODE, [7 4 -2 -1] and binary addition ...
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20 views

Data rate with modulation and conventional encoding

I had a rather simple question. Say I had a SISO communications system with an information data rate of 50 Mbps that uses QPSK modulation and a rate 1/2 conventional coding. What would be my symbol ...
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1answer
30 views

interrupt-on-change on 8051 microcontroller

I am trying to read the speed or number of rotations pulses of a self-made encoder motor. I am using an AT89C52 microcontroller. It gives external interrupt on rising or falling edge. How can I ...
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21 views

how to use Sick ATM60 encoder configuration commands

The Sick ATM60 SSI Absolute Encoder documentation describes 29 function commands that appear to be useful to configure the encoder and obtain configuration information. The electrical interface ...
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30 views

Max frequency of LPC1768 QEI

Does anybody know what the highest frequency the LPC1768's QEI can handle, with X4 encoding? I've checked the datasheet, and it wasn't clear.
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44 views

Quadrature Incremental Encoder A&B phase

It’s been two days that I’m searching to understand how an incremental encoder’s precision is quadratured. I found out that we must be counting the state changes of the two channels A and B, where ...
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3answers
134 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 ...
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3answers
111 views

Generate a false encoder signal CW/CCW 1/4 shifted

I need to generate a 10-100khz square signal freq. to simulate an encoder. I'd like to be able to simulate CW and CCW, shifted by 1/4 th signal. I've thinked about a crystal with a pot and some logic ...
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41 views

CXA1645 replacement - most convenient switching between PAL and NTSC

I have built NTSC encoder using CXA1645, and picture through composite out is great. Now I want to extend it to PAL, because output device encoder is attached to can operate in both modes, changing ...
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73 views

4 axis quadrature encoders? [closed]

I am currently working on a digital input card which will feature quadrature encoder inputs. To my (basic) knowledge, quad encoders use two pulse trains that are 90 degrees out of phase with each ...
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0answers
29 views

Choosing a position sensor (encoder) and obtaining velocity from it

How do I know how many counts per revolution I need for an encoder for my application? I need to be able to accurately capture a 1000 Hz signal on an input side running from 1-133 rev/sec (60-8000 ...
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1answer
147 views

Quadrature Encoder Interface Circuit

This is an interface circuit of Quadrature Encoder (A, A', B, B') with MCU. I cannot make sense of the working of OpAmps in this circuit. Is it some standard circuit for doing signal conditioning or ...
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1answer
154 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. ...
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2answers
62 views

quadrature encoder

I have an quadrature encoder. my minimum and maximum positions are fixed, and I can count the relative position. If my encoder is mid way, looses power and is then restarted, how can I know my current ...
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1answer
45 views

PIC QEI encouter values being weird

I'm getting weird values when using the QEI on the dspic33. The QEI counter goes up to about 32700 then goes to negative 32650 and starts decrementing to 0 where it starts from 32700 and starts ...
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695 views

How can I design a 8 to 3 priority encoder using 4 to 2 priority encoders?

This is what I've done so far and I really don't understand how to continue. The V variable is for verification [EDIT] it works for Y2 and Y0, but it doesn't work for Y1
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1answer
114 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 ...
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543 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 ...
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1answer
63 views

Step down open collector circuit

I'm trying to use the LPD3806-400 incremental encoder with an Arduino DUE. I have the problem that the datasheet says 5 V to 24 V and also the output is open collector. Therefore, I have to pull up ...
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1answer
165 views

Unusual Rotary Encoder Output

I'm trying to replace a rotary encoder with push switch from a Boss SE70 effects unit as the switch is broken; the same encoder is apparently used in a number of Roland products such as the JD-990, JV-...
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1answer
137 views

How do memory seats keep track of their position?

I was wondering how do memory seats keep track of their position. Since this kind of equipment existed in 1990's cars, it must be simple yet ingenious. I have been thinking about this for quite a time ...
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1answer
145 views

What do the pins mean on this rotary encoder?

I'm trying to repair a speaker of mine (old AudioEngine A5). The encoder that controls the volume is not working properly and turning the volume up REALLY loud sometimes when you touch it. I had some ...
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1answer
83 views

Confused why outputs of a priority encoder could be X instead of 0 or 1

So this is the truth table given for the Priority Encoder: and this is its logic diagram: I am extremely confused with the part where the outputs x and ...
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2answers
1k views

Why do we need bit scrambling when using 8b/10b?

I want to ask the opposite of this question. Here are the purpose of the bit scramblers: Encrypt, but LFSR (and other used) bit-scramblers are breakable. Clock recovery, but it is done by the 8b/ ...
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2answers
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Implementing a function using decoder, encoder and some gates

Implement the function F(A,B,C,D,E) = A’B’C’DE’+ABCD’E using only the components required from the ones given below: One 3:8 decoder with active high outputs and an active high enable input One 8:3 ...
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201 views

Is the wikipedia article on 3b4b encoding in 8b10b encoding correct?

On the wikipedia page for 8b10b encoding (as of writing), the 3b4b table shows that if RD=-1, the outputs can have more 0's than 1's, and if RD=+1, it can have more 1's than 0's. This does not make ...
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1answer
515 views

Problem with my 8-to-3 line priority encoder using verilog gate level description

I am attempting to build a working 8-to-3 line encoder using gate level description in verilog. Although, I have working models, in terms of successful compilation and simulation, the recurring issue ...
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1answer
40 views

2D Positioning Localization

I have a robot. My robot has three main sensors one is a gyro from which i can get my yaw, pitch, and roll. I also have an encoder in the x and y axis. How can I use these sensors together to reliably ...
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229 views

Determining optical rotary encoder RPM

I hope the first part of this question isn't too physics based for this forum but I am trying to use an optical rotary mask encoder such as this one (Optical Encoder Pair Kit) to determine the RPM of ...
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1answer
57 views

Testing an Encoder's Accuracy

I'm using a high-frequency (1024PPR) RS-422 encoder, connected to a differential line receiver, and in turn, a quadrature encoder interface. Initial tests were conducted with a low-PPR hand turned ...
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1answer
46 views

Tail biting Convolution Encoder

I understand how encoder and decoder works but what are theses values ??
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4answers
462 views

Method to determine angle of a rotating stage

I am currently working on a project that requires the rotation of polarizers to very specific angles. It is necessary that we are able to determine what angle the polariser is currently at so that we ...