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Subject: light sensor problem

Date: 08/20/01 at 8:01 AM
Posted by: ravi abeydeera
E-mail: s373892@student.uq.edu.au
Message Posted:

hi all. i need a second opinion. my group is required to transmit information from the computer monitor to a 'key-ring-sized circuit'.

we will be writing software that produces a series of white/black flashes on the computer monitor......the key-ring is programmed by holding it up to the monitor..

the group decided to use a phototransistor instead of a light dependent resistor (because of speed) and i was wandering if it would be better to use a photodiode instead.

also, as you know the computer monitor does not produce constant light, it scans continously, thus producing noise at the output......does anyone have any suggestions on a way of filtering this noise and any ideas on how to improve the cicuit...

...the cicuit will be hooked up to +5v and will be used as an input to a microcontroller in order to record the data.

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