Photosensor

A project log for Low-resolution scanner for cheap data input

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

Yann Guidon / YGDES • 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...

Next log

Phototransistors

08/02/2017 at 22:24 • 2 comments

Discussions

Morning.Star wrote 04/22/2017 at 01:00

Why dont you try LEDs? They behave as photodiodes. You'll need an amplifier to interface to them but they are essentially the same thing. Superbright reds are the most responsive. :-)

I've tried using 2.7v SMD LED chips, they work as well if you want a *really* small sensor array.

Also, Copper Oxide III (red) is photo sensitive and changes resistance in response to heat and light. ;-)

Are you sure? yes | no

Yann Guidon / YGDES wrote 04/22/2017 at 07:23

BPW34 would be the solution ;-)

Are you sure? yes | no

Photosensor

Phototransistors

Discussions

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