Low-resolution scanner for cheap data input

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Or "let's revive the idea of the punched cards" for our kids' delight, but without the holes

yann-guidon-ygdes

Yann Guidon / YGDES

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Phototransistors
08/02/2017 at 22:24 • 2 comments

@jaromir.sukuba sent me some KPX80

http://www.teslakatalog.cz/KPX81.html

The title of datasheet reads: "silicon planar phototransistor NPN, for photoeletric sensors of punch tapes or positional sensors".
The pitch is 2.54mm, not 2.5, but it's still good for a 5mm pitch.

The remaining question is : what is the spectral response and what type of light should I use ?

The only mention I find is a 2400°C temperature, which might be understood as "warm white"... Some incandescent light would do, it seems. This begs tests !
Photosensor
04/21/2017 at 22:05 • 2 comments

I just got a few CNY70.

Unfortunately they are a bit too large... 6mm instead of 5mm wide, so I can't use regular 5mm paper...

I still have to see what I can do with the BPW34.
If I can find them in my workshop, since I got them before the renovation...