Scavenger hunt?

[anfederman@comcast]

Occasionally, while rummaging through the rubble pile that is my garage I find mystery components like those poorly pictured in the attachments.   I think this is a quadrature optical encoder, but can't find any web reference to them.  I also don't remember how I got them, but I think it might have been at a HBRC meeting.

the writing on the device is:

 

KAT00099

   QT831J

 

This is sort of the thing that Alex Sy occasionally brings to our meetings.  If anyone has a clue (I am not being sarcastic) please share your knowledge.

 

 

Hope to see you at the SIG.

 

Alan N. Federman, PhD
http://federman.best.vwh.net
http://www.linkedin.com/in/alan1federman
(408)227-6106 Home
(408)826-1795 Mobile

[Butokim]

Alan,

 

This looks exactly like the encoders I have salvaged out of printers.  I don't have any specs on it, though

 

James M. Geidl, K6JMG
D.B. Cooper, you have  a message.
 

---

From: hbrob...@googlegroups.com [mailto:hbrob...@googlegroups.com] On Behalf Of anfederman@comcast
Sent: Wednesday, March 20, 2013 11:11 AM
To: hbrob...@googlegroups.com
Subject: [HBRobotics] Scavenger hunt?

[Alex Sy]

The QT831J was meant to provide an early detection of reaching the stop (early detector) so you could slow down the motion then using the second detector (inner) to actually stop.  In this mode, it can detect an object as small as 1 mm.  It is possible to use it as a quadrature detector, but each opening/blockage on the disk has to be larger, like about 2mm.  A quadrature disk for this unit has to be designed like we talked about yesterday, as two concentric rows of holes.

 

The pin out is as follows:  Pin 1 is marked with a number 2 on the PCB of the unit.

1  VCC, use +5V +/- 10% as a supply to power the LED and the two sensors.

2. Outer detect, open collector, so you need a pullup resistor, 10K, to VCC or less (like 3.3V) so you can use this with 3.3V microcontroller inputs.  Goes high when blocked.

3. Inner detect, open collector, so you need a pullup resistor, 10K, to VCC or less (like 3.3V) so you can use this with 3.3V microcontroller inputs.  Goes high when blocked.

4. GND ground reference, internally tied to pin 5.

5. GND ground reference, internally tied to pin 5.

 

Output is open collector, so it needs a pullup resistor like 10K to +5V.

Output is high (pullup voltage) when blocked, low when unblocked (<0.3V).

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