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I would like to ask if anybody knows some technology which is like array of phototransistor with accuracy in mm . Like some display on which I put someting and get by wire data of pixel which are shadowed, just only logic state ( 0 = Nothin/Ligh, 1 = Someting is put down on screen/Dark). 

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enter image description here

My first idea was solve it by many phototranzistor in matrix, but it haven't that necessary accuracy which I would need. ( I think even SMD phototranzistor for this are so "big").

Thanks everyone for some help, and I'am sorry for my poor English. I hope you have get it what I've been wrote there.

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  • \$\begingroup\$ I user_somenumber, welcome to EEsx. If I understand your question, you are searching for a component that can read if light is hitting it or not, with the precision of 1mm, arranged in a matrix. If this is right please add some informations about your project and your thoughts up to now: on this board questions like "where to buy this product" are not allowed, and your question is borderline. \$\endgroup\$
    – Vladimir Cravero
    Commented Aug 3, 2014 at 8:51
  • \$\begingroup\$ Welcome to EE.SE! If I understand correctly, you're looking to buy this component, not to make it yourself? That makes this question off topic following the guidelines ([help:on-topic]). I'm voting to put this question on hold until this is clarified. But besides that, isn't what you're looking for a simple low-resolution B/W camera? It depends with what kind of chip (and other factors, like power consumption) you want to read the data if that's a possibility, of course. So also this would be good to mention in your question! Thank you :) \$\endgroup\$
    – user17592
    Commented Aug 3, 2014 at 9:31
  • \$\begingroup\$ An array of light sensing devices? Sounds like a camera. \$\endgroup\$
    – Phil Frost
    Commented Aug 3, 2014 at 12:18
  • \$\begingroup\$ @Camil: Since he's asking about the technology and how to do it and not for where to buy it, I don't get that it's off topic at all. \$\endgroup\$
    – EM Fields
    Commented Aug 3, 2014 at 12:25
  • \$\begingroup\$ @OP: How many pixels do you need and what kind of accuracy are you looking for? \$\endgroup\$
    – EM Fields
    Commented Aug 3, 2014 at 12:29

2 Answers 2

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You can use an optical mouse sensor, basically a low resolution B&W camera. The Agilent ADNS-3040 is one such sensor. You might need some optics for your application.

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  • \$\begingroup\$ That's a clever approach. You can even read out the 22x22 pixel array "for diagnostic purposes" which makes it a lot easier to test alternative optics if you use it for applications other than as the guts of a mouse. \$\endgroup\$
    – RBerteig
    Commented Dec 31, 2014 at 22:52
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I would suggest that you use a 2D CMOS sensor.

These are arrays of very small micro-meter size light detecting elements. They are easily found like 640x480 arrays. The complete sensing size of the chip would be some mm^2.

And, because it seems very important to you, the relative positioning of the sensing element on the array is almost perfect. (tolerances in the micro-meter range, maybe better)

If you don't need that resolution, just bin the pixel. That would decrease the noise and reduce the amount of provided data.

Unfortunately, you didn't specify what the application is. This solution requires that you plug your sensor into a MCU (which may require to be a fast one) or any kind of digital system such as CPLD, FPGA etc...

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