Optical Wheel Encoder with DC motor on Arduino

MaxHeadRoom

Joined Jul 18, 2013
20,875
There should be two LED's and two receivers, typically the LED's each require a series resistor and the outputs, typically open collector, require a pull up resistor,
Each unit is distinctly separate. IOW 2 in 1.
Is there no part number on the opto unit itself.?
Max.
 

Thread Starter

grgDek

Joined Mar 20, 2020
11
There should be two LED's and two receivers, typically the LED's each require a series resistor and the outputs, typically open collector, require a pull up resistor,
Each unit is distinctly separate. IOW 2 in 1.
Is there no part number on the opto unit itself.?
Max.
Thanks !
Here some photos of the burned one, but i think it must be the same connections and the same characteristics for all three coming from my printer.
FRONTphoto_2020-03-22_17-26-53.jpg
TOPphoto_2020-03-22_17-26-53 (2).jpg
BOTTOMphoto_2020-03-22_17-26-53 (3).jpg
We can see numbers but I don't know the meaning ...
 

Thread Starter

grgDek

Joined Mar 20, 2020
11
I opened the burned encoder to see what's inside, I can see one Led and something like a photoresistor, photos :
photo_2020-03-22_18-02-40 (2).jpg
the photresistor ? ends up in 4 pins


photo_2020-03-22_18-02-40.jpg
The LED ? ends up with 2 pins

EDIT
photo_2020-03-22_18-10-53 (3).jpgphoto_2020-03-22_18-10-53.jpgphoto_2020-03-22_18-10-53 (2).jpg


Thanks guys :─)
 
Last edited:

MaxHeadRoom

Joined Jul 18, 2013
20,875
You normally would have a minimum of 6 connections with 2 discrete sensors, 0v, 5v, LED1, LED2, OUT1, OUT2. or 5 with single LED source.
Or 4 if LED rsistors on board.
If all else fails there is a 100 slot dual opto quadrature encoder on ebay for $3.00. They just have 4 connections
The disc is small 22mm across.
Max.
 

Thread Starter

grgDek

Joined Mar 20, 2020
11
You normally would have a minimum of 6 connections with 2 discrete sensors, 0v, 5v, LED1, LED2, OUT1, OUT2. or 5 with single LED source.
Or 4 if LED rsistors on board.
If all else fails there is a 100 slot dual opto quadrature encoder on ebay for $3.00. They just have 4 connections
The disc is small 22mm across.
Max.
I have 6 pins with a single led i think. We can clearly see the LED and the photoresistor on the last pics i send.
I know i could order an all in one optical encoder, ready to use, plug & play, but it matter to me to use what i find around me, locally, and to reuse those electronics in order to build alternatives tools, and for the shear hell of it !
 

Thread Starter

grgDek

Joined Mar 20, 2020
11
Hey everyone !
I finally found what went wrong, a wrong pinout of my encoder, as simply as that. I figure it out by finding and reading the Service manual of my Pixma IP4200 inkjet printer here

Next step is to control a DC motor using the data from the encoder
:─)
 
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