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Date: Sat, 25 Feb 2006 07:04:37 -0500
From: Chad Robinson <crj@lucubration.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Fire Detector Unit
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Tracy Hallock wrote:
> 
> After seeing Mark's demonstration, I was pretty impressed, so I did a 
> search on the internet for similar products.  The link below looked 
> promising:
>  
> http://www.georgejenson.com/rv7.php
>  
> They include a board and the detector for $72.  Unfortunately, I am too 
> far off from needing this yet, but someone else might like to experiment.

Tracy, did you mean to include this link as opposed to the one above?
http://www.acroname.com/robotics/parts/R67-UVTRON.html

This is a good way to go if you're serious about using this detector. It runs 
on 10-30VDC, and you can get a project box from Radio Shack for a few bucks 
that will fit it.

Note that if you want to use this, you will need some way to indicate its 
output. A good way would be a 12V relay, light, and buzzer, also from Radio 
Shack. You'd hook the relay to "output pin 3 - Open Collector Output", and use 
it to drive the indicator light (or LED) and the buzzer. Make sure the coil 
rating of the relay you get doesn't exceed 100mA at 12V (coil resistance 120 
ohms max).

Finally, the output of this thing is a very short pulse. The spec sheet for 
the driver circuit says you can add a capacitor at a spot on the circuit 
board. Again, Radio Shack sells capacitors. A 1uF value across the Cx 
terminals will make the output pulse for 1 second at a time. Don't forget to 
jumper the "background cancel level" terminals, too. Looks like you'd want to 
use position 3 - they label this "general use". You can experiment with a 
different slot if it's falsely triggering.

Sounds like a lot of hookup work, but you could probably do it (minus wiring 
and installing it) in 20 minutes. I'm just trying to be detailed. =)