Re: Re: Light sensor circuit 0-5 volt output help required

[Kevin Hawkins <lists@xxxxxxxxxxxxxxxxx>]

You might also want to have a  capacitor and  resistor on the output
to
cause the output to be 'averaged' over a longer period .  You can still
have both types of output.  The value of the capacitor/resistor
combination would effectively govern how fast it reacted to changes in
light. A variable resistor might be useful  This would avoid clouds and
other things (lightning, birds, car headlights) from triggering your
sensor. Although if you are reading the sensor through an A/D converter
you could accommodate this in software too.

Kevin

( op amp out to resistor to capacitor to ground,  the averaged o/p is
available at the junction of the resistor/capacitor, choose time
constant accordingly)

ukhauk wrote:
> Thanks Frank on the soldering iron as we speak
>
> --- In ukha_d@xxxxxxx, "Frank Mc Alinden"
<frankmc@...> wrote:
>
>> Hi Jason
>>
>> Maybe you can  use the circuit in the link....with some small
mods..
>>
>>
>>
> http://science.uniserve.edu.au/school/Seismograph/detector/index.html
>