RS sensor and relay info

Data

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I built my first DataCam with a 5v relay given to me by a friend that he had in his shed for a long time. I am using the RS sensor with a Canon PF. The RS sensor is set to alarm mode which gives me a 30 second delay between pictures. This works perfect. I only get one picture every 30 seconds. I read where others were getting multiple pictures with this setup, however It has never happen to me.

Now, I built my second DataCam with the Radio Shack reed relay 275-232 as stated on Jesse's page. Well, with this relay I was getting multiple pictures taken if the sensor was in alarm mode. I started thinking that maybe different types of relays may react differently even if they are 5V relays. So I tried the RS relay 275-240 and it solved the problem. With this relay, I am only getting one picture during the 30 seconds of alarm mode.  So if you have a RS sensor and are getting multiple pictures during the 30 second alarm mode, check your relay.
 



Archilochus

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Hi Data,
This is probably due to different "dropout" or "must release" voltages for the different relays.

Some of my data books show a "dropout" voltage for a typical reed relay (like the RS 275-232) at about 1 volt.  The heavier duty relays (like the RS 275-240) often have a dropout voltage as low as 0.25 volts.

So the voltage of the "alarm output" signal of the RS sensor (the RS# 49-425, right??) probably drops below the 275-232's dropout voltage, but not  that of the 275-240.

But possibly as your battery weakens, or maybe even during  high or low temps, your heavier duty relays might behave differently, causing multiple pics - something to look out for.
Also - that relay is on for 30 seconds for each pic, right?  If so, you're going to go through batts faster as the 275-240 uses about 4.5 times more power than the 232-275.

Good Luck!,
Archilochus
 

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