Was thinking about that, I may make a Mk. 3 version with an Arduino Nano micro-controller, which has a delay on it, the Viper does to stop false alarms from insects. Might give using IR LEDs a go too

On 06/04/2019 at 20:00, Gabs said:

Thanks, I have one of the "Modern Alarms" bell boxes with these in, will get a pic. Well, mine didn't false alarm at all, during light tests I did, I'm impressed. I know, looked on Google for some pics. Don't know why they couldn't be as simple as the one that I made. Those Hexagon bell boxes were such a good design, shame they changed it. The idea of a foam detector is flawed anyway, by the time it has been squirted? in it would be too late.  

Is that a high security modern box?