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17
votes
1answer
1k 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?
7
votes
3answers
725 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 ...
5
votes
2answers
223 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
107 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 ...
4
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 ...
4
votes
1answer
330 views

Robot Encoder Position

I've been using a Motoman and I'm wondering what is the best way to recover when the encoder position has been lost. I've tried lining up all the reference marks on the joins but this can be a bit ...
4
votes
1answer
264 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 ...
4
votes
3answers
621 views

how to have custom Scancode set

I'm new to hardware field in general. For one of the projects, I'm trying to create a custom keyboard that will have some extra keys, say 20-25 more than the standard keyboard. I read about scan ...
3
votes
2answers
580 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 ...
2
votes
6answers
2k 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 ...
2
votes
3answers
2k views

how to count 2 wheel encoder signal?

I'm looking to a simple solution to keep the position of a robot. It has two DC motor and one wheel encoder for each. The encoder are incremental type. I need to be able to get the current count of ...
2
votes
4answers
595 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 ...
2
votes
4answers
308 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 ...
2
votes
2answers
141 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 ...
2
votes
1answer
47 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 ...
2
votes
3answers
432 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 ...
1
vote
2answers
221 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
1answer
63 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 ...
1
vote
3answers
225 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 ...
1
vote
2answers
415 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 ...
1
vote
2answers
142 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?
1
vote
4answers
253 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 ...
1
vote
2answers
160 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
93 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
116 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 ...
1
vote
2answers
318 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
1answer
113 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
vote
0answers
165 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 ...
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 ...
0
votes
2answers
245 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
4answers
546 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 ...
0
votes
1answer
184 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".
0
votes
2answers
246 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 ...
0
votes
2answers
61 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 ...
0
votes
1answer
61 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 ...
0
votes
1answer
80 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
328 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 ...
0
votes
0answers
56 views

Jitter in Pulse Interval Encoding (PIE) [closed]

How can one analyze the jitter performance of an encoding scheme, say PIE?
0
votes
0answers
107 views

Looking for hardware SoC JPEG encoder [closed]

I'm trying to build an image system using an Omnivision OV10633 sensor (1280x720p) and am looking for a chip that can convert the output of the sensor (10-bit RAW or YUV422) to a JPEG encoded stream ...
0
votes
0answers
96 views

Encoder Modules for Hobby Project [closed]

I'd like to use something like the AEDR-8300-series reflective optical encoder module in a hobby project. Ideally someone with minimal to moderate skills should be able to reproduce it, which means ...
-1
votes
1answer
48 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 ...
-5
votes
1answer
286 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 ...