2 replies to this topic

[GaryDyksman]

Here is Africa, many office parks share toilets. And that mean that it is very likely that when you need to go do your business, that there can be a very nasty surprise waiting for you when you open the door. So I was wondering if you guys know of a sensor or group of sensors that I could use to create a early warning system. LED on the door frame to just tell you to turn around and walk away...

 

(Please stop laughing!)

[CW2]

For really early warning system Smell-O-Scope by professor Hubert J. Farnsworth. Not sure about the interface, though 

[Verdris]

I'd do two identical water temperature sensors, one in the tank and one somehow in the bowl. If the readings differ significantly for a while after someone has left the bathroom, they probably didn't flush.