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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6answers
84 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 ...
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1answer
48 views

G.711 for dummies

I am in midst of some online telephony course, and there are questions regarding which I have no one to ask but this community. G.711 volume encoding. I have some difficulty to understand how ...
0
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1answer
30 views

Encoder sampling rate realization

I know that questions from a mechanical engineer might sound a little naive to you :), but here I go: I am trying to use an Arduino Uno as the brain for a DC brushless motor that we have for a ...
1
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2answers
59 views

DIY passive RFID? [closed]

I'm interested in building my own "DIY" RFID scanner and tags. For the scanner, I think I would just need: Transceiver Some kind of hardware polling mechanism to have the scanner scan, say, every 2 ...
0
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2answers
119 views

How to use a 10 pin dip switch on a 8x3 Encoder (IC 74LS148)?

I've been trying to get an 8x3 encoder (IC 74LS148) working using a 10 pin dip switch, I simply connect the 1-7 ON sides of the switch as inputs for the encoder and the OFF sides of the switch to the ...
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0answers
68 views

Generating a Trapezoidal Motion Profile

I'm working on a project which involves the use of a servo motor to pull an object along a track. The servo motor will have a quadrature encoder to calculate the position. I'll probably implement this ...
0
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1answer
45 views

Is there any significant difference between the couple of photointerrupters and a reflective?

This may sound a little bit silly though.. but I do hope you guys can give me a little bit of tips if u do have any? :) Which kind of optical encoders you think is the easiest to use if I am to ...
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3answers
118 views

Planning to make a pen-like device which has a roller rolling on a surface and measured its linear distance travelled

I am planning to use a microcontroller to do the brain works of receiving pulses from the encoder and compute it to output linear distance and at the same time indicating the measured distance as ...
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0answers
40 views

Encoders Pulling Too Much Current

I bought six of these optical encoders for two omni-directional robots. They are powered by a 12V battery pack regulated with a LM7805. One set of encoders (the one on the working robot) pulls 0.03 ...
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2answers
97 views

Multiplexing signals of two wires of a BNC cable and transmitting over a single wire

Background: I have a normal CCTV camera (650 TVL) . It requires a BNC cable in order to feed video signal from camera to DVR. Problem The problem is I have only a single copper wire from CCTV to DVR. ...
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4answers
216 views

Cheap, reliable, low resolution, linear position sensor

The question I am looking for an absolute linear position sensor that can span a distance of 40 cm with ~5 mm accuracy. My primary concerns are reliability and cost at a production scale of ~10,000 ...
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2answers
59 views

Cell phones video encoding

My question is, how are cell phones bale to produce on the fly video like mp4? Are they using a hardware encoder chip? Because most of them run on ARM chips? Are there ARM chips that can handle the ...
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4answers
189 views

Dialing a miniaturized stargate

I want to build a miniaturized Stargate but I have no clue regarding the electronic part. The Stargate is a fixed circle with 9 chevrons (see links bellow). An inner circle is spinning inside the ...
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1answer
125 views

Netduino Interrupts Affected By PWM - Diagnosis of Issue

I've got a funny problem with interrupts and PWM signals that's causing false interrupts to trigger. What exactly is happening is that I'm using a hardware debounced quadrature rotary encoder. The ...
0
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1answer
54 views

design a 8 to 3, valid output - priority encoder with AND,OR,NOT Gates

I'm trying to implement a 8 to 3 priority encoder which worked quiet well. My function for the three outputs are: A0=e1+e3+e5+e7 A1=e2+e3+e6+e7 A2=e4+e5+e6+e7 Now I want to add an output which ...
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2answers
94 views

Coding a priority encoder

Let's say I have a 25bit priority encoder. So each input pin from \$i_{24}\$ to \$i_0\$ has its distinct priority in our encoder. That means that if more than one inputs are active, the encoder will ...
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1answer
106 views

Monitoring a fan with 2800 RPM with a Siemens 27-226 PLC

I have a fan that rotates at 2800 RPM. I need to make sure that the fan is operating. I need to monitor the fan. It has an output that gives a signal 2 times per rotation so it's 5600 pulses which is ...
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2answers
128 views

Motor/driver for smoothest and most constant speed

Which type of motor/controller can maintain the smoothest and most constant speed in the range 300 - 1000 rpm with minimal vibration? ie: low cogging torque, etc. I have an application in mind which ...
1
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1answer
112 views

Do any rotary encoders allow zero idle current

Many microcontrollers and logic devices (programmable or otherwise) are capable of drawing very little current when nothing is happening. If a double-throw switch is wired to such a device, then when ...
1
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1answer
71 views

Wiring up a Knitter-Switch rotary encoder

I have two MERP 12 24 126 GR rotary encoders from Knitter-Switch. The only information i can find regarding this encoder is here http://www.knitter-switch.com/pdf12/E-2012-MER12-MERP12illuminated.pdf ...
2
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2answers
65 views

Create a fake depth encoder signal on a surface system?

I am trying to create a test box which will do away with the actual depth encoder as it is awkward to have out all the time the encoder is similar to this: ...
3
votes
2answers
414 views

Incremental Encoder and Arduino

I have wired a 600 p/r incremental encoder to an Arduino Uno. My question is this: Given that the Arduino has a clock speed of 16Mhz and I really do not want to miss a single pulse I am creating a ...
0
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1answer
85 views

Handling large numbers of input contacts

I'm trying to interface a large number of contacts (<=1024) under velostat with an arduino DUE. I have a large array of pads and I want to detect when any one point goes high (think of this as a ...
3
votes
3answers
234 views

Motor Control with PMW or RPM on heavy robot

I'm going to try to explain my problem as clearly as I can. I have been building a robot that has four wheels, 2 motors and 2 free wheels. Its a differential drive system. ...
2
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1answer
986 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 & ...
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0answers
57 views

Meaning of GS output parameter in TTL octal encoder (LS148)

LS148 encodes eight data lines to three-line (4-2-1) binary (octal). We had an experiment wherein there are eight push buttons corresponding to decimal inputs from 0 to 7. In our experiment, the state ...
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1answer
141 views

Whats the name of a BMW iDrive type of encoder? [closed]

I am looking for a component that some people call a 7 way encoder switch. Basically, if you look at the center piece of the BMW iDrive, its that. It's a knob looking piece that if you turn to the ...
1
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1answer
120 views

Measuring rotations problem with motor encoder

I have this motor encoder mounted on the back of a 120RPM motor which has a gearing of 298:1 ratio. The back shaft is directly from the motor, not through any gears. Im using an encoder disk that has ...
2
votes
2answers
366 views

Low cost high precision linear position sensor

I am trying to find a low cost high accuracy linear position sensor that can be used in a hobby 3D printer. Almost all current 3D printer designs rely on stepper motors to provide positioning but I ...
1
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0answers
108 views

Control Loop Frequency [closed]

I haven't started tuning/setting up my controller(s) yet, but already having trouble with the control loop frequency. This code shall later control the position of a X-Y stage. The code: ...
1
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5answers
221 views

Poor man large linear encoder

I'm looking for a way to build a cheap 1m linear encoder. Precision should be around 2cm (which is not really "precision"). Any advice will be welcome. @Joe Hass : yes it is moving. Not really fast. ...
0
votes
1answer
53 views

How IC encoder ΤΧ-2, encodes signals?

I 'm trying to figure out the way IC encoder ΤΧ-2, encodes signals. The procedure, if I am correct, is: Receives input data (DC signals). Generates digital pulses, via an internal oscillator. a. in ...
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4answers
164 views

Adding indicator LED to optointerruptor circuit?

This question relates to my earlier question on how to wire an optointerruptor:Figuring out wiring of optical encoder I was able to get the optointerruptor working using the circuit below. I wanted ...
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0answers
76 views

Signal encoding on Realtek TX2 IC [part 2]

The image below shows IC Realtek TX2 encoder (pinouts and block diagram), which is part of an RC car transmitter circuit. Datasheet refers: "The frequency of pulse depends on the local oscillator ...
1
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2answers
159 views

Figuring out wiring of optical encoder

I have a linear peristaltic pump (salvaged from medical equip. - likely used for dosing, etc). It uses a stepper motor and an optical shaft encoder. I have the motor working but I am confused about ...
-1
votes
1answer
86 views

What will happen to the reading if the “A-connector” is grounded in an incremental encoder?

I have a machine, that the reading is around 50% of expectation. I guess maybe the "A-connector" is grounded accidentally during it is made. However, I cannot reach the wire. I don't have an extra ...
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votes
1answer
91 views

Signal encoding on Realtek TX2 IC

I 'm trying to figure out the way IC TX2 encodes different signals (RIGHT, LEFT, FORWARD, BACKWARD, TURBO). I can understand that presence of voltage means an appropriate signal to be transmitted. ...
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2answers
119 views

Defining the pins of Realtek TX2 IC

Can anyone explain clearly what is the purpose of SC and SO pins of TX2 encoder? Why SC isn't connected anywhere?
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3answers
150 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 ...
0
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3answers
2k views

Motor speed control using arduino and quadrature encoders

I am trying to get precise control over the speed of rover 5 based robot. It has four PWM controlled motors and 4 Optical Quadrature Encoders. I am using 4-channel motor controller with rover 5 ...
6
votes
1answer
280 views

Weird servo mechanism

I want to use a servo taken by a radio-controlled car. However, I found out that wheels' rotation (front wheels) is not performed by a servo, but from a motor to move the wheels and a mechanism for ...
2
votes
1answer
717 views

RF Module Not Working

I'm working on RF Module(433MHz ) for Communication between Robot and controller. So I want to test this first. Here is the thing I've used two Encoders Named HT12E and HT12D which are WORKING Fine ...
2
votes
0answers
83 views

Gear motor with encoder: minimum drivable step

I am fancying this motor http://www.pololu.com/catalog/product/2271/specs to motorize an X-Y stage. (Alternative High rpm motors with high reduction ratio and high encoder counts/rev are welcome ;) ...
5
votes
3answers
306 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
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1answer
478 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
310 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
219 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 ...
4
votes
1answer
234 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
524 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
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1answer
248 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 ...