Dusk to Dawn sensor???

grtwythunter

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I've been using my cam on a local ranch to get pics of coyotes. My problem is that I can only run the cam at night because there are people walking past it all day. I am using a thermostat on it right now, but it only turns the cam on for a few hours a night, due to the temp settings I'm using. My question is...Has anyone managed to make a photocell from a dusk to dawn light work in one of these cams? I remember about a year ago someone was messing with one trying to make it work. I looked through all of the old posts, but couldn't find it. Any help would be appreciated!! Thanks.           Scott
 



davered1

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If i'm not mistaken the MS20 already has a night only mode. all you need to do is set it to auto mode.Dont remove the light senor when modifying board either.You will have a 1 1/2 minute delay unless you modify it with one of gantley and jonj5's on board timers.

Someone correct me if I'm wrong , I have been known to be wrong before, once, I think?

Dave

(Edited by davered1 at 8:00 pm on July 5, 2002)
 

Jon5ja

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Hi, Dave et al.

As supplied, the MS20's day/night sensor will only work if you're running it at 24 volts.  Depending on the voltage at which you're running the MS20, you'll need to change R27 (it's a 6.8K from the factory):

For 12V, change R27 to 15K
For 9V, change R27 to 22K
For 6V, change R27 to 33K

This will allow the factory circuit to work as designed (the turn-on may be a little darker than factory, due to my rounding up to standard resistor values).

Jon
 

davered1

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I guess I have to mark it up to twice.

Mind you I was half right!!:dancinred:
 

grtwythunter

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Thanks guys. Just so I know in terms that my simple, non-electronically inclined mind can understand....since I'm running my MS20 at 9v, I need to change R27 to a 22k resistor. Then when the sensor is switched to "auto" it will come on at dusk and turn off at dawn(or thereabouts). Thanks again.              Scott
 

Jon5ja

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grtwythunter,

Yep, that's it (unless I lost my mind calculating, but it looks like a reasonable number since you cut the voltage to about 1/3 and you approximately tripled the resistance).

Jon
 

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