Power failure alarm idea ?

You should be able to get a compatible phone for under R1000 second hand. In comparison to a dedicated GSM unit, an addon GSM unit for a alarm system or aquarium computer this is quite a bit cheaper. Also it's all relative to the cost of your livestock. It was written more for marine tanks where livestock is generally worth quite a lot more than freshwater tanks.

---------- Post added at 08:11 ---------- Previous post was at 08:11 ----------

If you're going to open it up why not just connect a buzzer? You can get piezoelectric buzzers for about R40 and those lights for about R120-200. Probably easier than DIY'ing completely.

 

Does it need to be a remote alarm or for the people on site?
Why not just use a cheap UPS? They have beepers and you even have backup power.

 

Thanks Zoom, good one I remember the times, sherrrrrrrrrrrr I will simply strip my son's new birthday gift, as soon as he gets to sleep, heee hee hee