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Page: technics-base-circuits-transmissive-optical-sensors_en.htm
Date: 2019.09.03 11:14:43 (UTC+1)
Name: Ted

Comment:
Thank you for the information you provide.

I have a question please bear with me since I don't understand this very well.

In the 6 pins sensor Can I connect either A or B to a GND?

I want to use the sensor as a switch is there a better way?

Thanks in advance.

Me: A and B are output channels. They should never be connected directly to ground since this will very likely destroy the sensor. A and B must be connected to the (high resistance) inputs of a microcontroller or a similar computing device.
The sensor can't switch lots of power (just one milliamp or so, see the datasheet for details). You must insert a mostfet between ouput A or B and the load to switch.

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Page: technics-base-circuits-transmissive-optical-sensors_en.htm
Date: 2019.08.04 11:43:45 (UTC+1)
Name: Eiko

Comment:
Thank you very much! That was helpful.
One question remains, Why did the sensor get destroyed while de-soldering? I have a sensor and need it for a project, I really don't want to lose it :(
should I try de-soldering it and hope for the best? I am gonna kill my boss in the end if it got fried.


Me: I ripped off a pin on my sensor because of the tight trough-hole mount. If the sensor is on a small board with nothing but the needed series resistors on, it is for sure better not to desolder the sensor. You can also try to get it off carefully by cutting the board with a tiny grinder disc on a Dremel.

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Page: technics-base-circuits-transmissive-optical-sensors_en.htm
Date: 2019.01.05 03:23:52 (UTC+1)
Name: Hernan

Comment:

Hi, i have this encoder  https://www.google.com.ar/search?q=encoder+incremental+arduino&prmd=ivsn&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjstqjmr9PfAhWSl5AKHSgQDxUQ_AUoAXoECBIQAQ&biw=360&bih=560#imgrc=Ndse2ofkNpCbdM

and I can not make it work, can you help me?

Me: Read the datasheet?
...and read all of chapter contact.

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Page: technics-base-circuits-transmissive-optical-sensors_en.htm
Date: 2018.05.02 08:55:41 (UTC+1)
Name: Rodrigo

Comment:
Hi, Thanks for all the information.
I was watching the Transmissive optical sensors project and i actually have the HP encoder of the figure 1 (Of  the project) but i donĀ“t know how to use and there's no information in the page about this model.
I really apreciated if you can help me.

Thank, and nice job!!

Me: There is more than one HP sensor in Figure 1 and there is lots of information on the page how to find out how to use an unknown sensor. Follow my instructions to get the pin layout or at least tell me about your measurement results to get a better answer, because I am no mentalist ;-)

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Page: technics-base-circuits-transmissive-optical-sensors_en.htm
Date: 2018.01.20 06:59:14 (UTC+1)
Name: seamiki

Comment:
A quick tip for making encoder wheels: the wheel can be drawn using processing, exported as pdf and printed from a laser printer on transparent foil.
Results are cheap, quick and very precise.
Hope it will be useful for someone as it is to me.
Brgds.

Me: For those that don't not know about "Processing", it is a free software available at https://processing.org/.

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Page: technics-base-circuits-transmissive-optical-sensors_en.htm
Date: 2017.08.29 07:11:10 (UTC+1)
Name: Thomas

Comment:
Your site has always been an insiration to me. i wish to share this article with others looking for info on this topic.
http://ichiro-maruta.blogspot.com.au/2010/02/blog-post.html
Apologies if this is an inappropriate

Me: Yes, the gray scale encoder might be an option for your project if you need absolute positioning. The automatic English translation is here.

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Page: technics-base-circuits-transmissive-optical-sensors_en.htm
Date: 2017.03.22 00:31:03 (UTC+1)
Name: sohaib

Comment:
thank you so much :D

Me: You're welcome!


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Page: technics-base-circuits-transmissive-optical-sensors_en.htm
Date: 2016.12.08 15:46:48 (UTC+1)
Name: Ned

Comment:
Dear Norbert,

Thank you for this excellent and very useful post.

Any idea how common 3.3V sensors are in printers of recent vintage?  I've salvaged several (Canon & HP) that work fine on 3.3V.  I'd prefer to drive them at 5V, but don't want to fry them if I can avoid it.  Do you know of a non-destructive test to figure out (or guess intelligently) the maximum voltage a salvaged sensor can handle?

Thanks and regards,
Ne

Me: All sensors I have salvaged from printers so far (Canon, HP and Lexmark) work fine with 5V. Sorry, but I don't know about a non-desturctive test other than reading the datasheet (if you find those for your sensors).
3.3V is not that common in printers. The thing is that 5V sensors usually start working fine at 3.3V, thus the chances are low to fry your's at 5V.

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Page: technics-base-circuits-transmissive-optical-sensors_en.htm
Date: 2016.06.09 18:45:37 (UTC+1)
Name: seamiki

Comment:
Good evening Mr Norbert, as anyone of your followers I found myself playing with rotary encoders scavenged from old printers.
A quick, empirical solution I came with at the time, was to look at the emitter through the phone camera (any digital camera will do)while touching its terminals with ground and 5v via 2.2k resistor.
If the led (IR, that's the reason of the camera) switches on mark the polarity. From there the sensor pinout is staight forward.
Thank you for this awesome chapter.

Me: A simple and quick way to find the correct pinout. Thanks for sharing your ideas!

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Page: technics-base-circuits-transmissive-optical-sensors_en.htm
Date: 2016.05.25 15:43:00 (UTC+1)
Name: Iranian

Comment:
Germans are cool people.
thank you

Me: You're welcome!