View Full Version : ENCODERS...

09-21-2004, 01:07 PM
hey, does anybody know, the source of shaft encoders to get the feedback of shaft speed. the encoders should be available in india. any source of redymade ones will do. i don t want to get into the problem of making one myself. still if anyone knows how to make good shaft encoders, easily that wud help. i mean any link etc. hey pulkit, u might definitely have worked on them.
Thank you.
Subhasis Behera

09-28-2004, 10:26 AM
Hi ....
i saw a very nice design at mig india u can check that design.
its link http://www.migindia.freewebindia.com


09-28-2004, 07:23 PM


09-29-2004, 11:14 AM
thank you vivek..... this is a good source...... i hope it will solve my problem.....

09-29-2004, 05:30 PM
If you are looking for small encoders I dont think that would solve your quest for encoders.

however, I hope you and anyone who plans to buy encoders have an idea of their price.

They might be anything from
Rs 2000 to Rs 18,000 depending on CPR and output type, and maker.

If you buy them, Please do post their exact prices here for everyone to view.

For smaller than these encoders: Search for HP encoders dealer.
as usual i forgot the name/details of a dealer in bangalore.
Try RS catalogue.
(order the catalog free or search on their website)

I guess any robotics hobbyist or even a major wont need encoders of resolution more than 512 CPR.
Anyway if you will use qudrature decoding of the encoder signals, the resolution would become 4 times. (512x4)CPR.


10-23-2004, 11:18 AM
HEY people!!

Well .. I dont know if any body among you people have done this...
But ... has anyone tried out the ir reflective wheel encoding thingy??

You know.. adding shiny spikes to your wheel.. and aligning a simple IR- reflective system... (the one used for line following ) with your wheels and then turning your wheels.. and reading the frequency of the detection of the shiny spikes... comparing it with some fixed frequency signal to get a count of wheel turns and then putting all that data into your micro controller to calculate or just using a comparator..

If not... I feel this is an easy and cheap alternative for wheel encoding...

Dunno about accuracy.. but "kaam - chalaau"..... yeah


10-23-2004, 11:02 PM
i guess what rao says is used in the comp mouse...
i just ripped apart one and there were gears touching the ball of the mouse.. the gears have small perforation (or holes whatever) .. and it is mounted so that it is between a diode and a phototransistor..

maybe use that .. :)


10-23-2004, 11:19 PM
The compute mouse sensors are fine 2 i had used them 2 ...:) . They work like a breeze . But you will have to know how to use them ... sadlly which is diffrent for diffrent mouses ( But mostly same )

01-27-2006, 08:11 PM
u can use a non contact type tachometer (electromagnetic pick up) which produces pulses which can be calibrated in whatever format you want .but you cannot find the direction