I'm looking for a cheap, simple and reliable sensor for long-term use and anti-theft application.
Let's say I have a big flower pot, it has an alarm. The alarm will trigger if the flower pot is being picked-up.
I've been thinking about to use limit switch, but I need to redesign the flower pot's bottom to make it fits inside the pot. For long-term use, i don't think it will survive long.
Proximity sensor (capacitive or infrared sensors), I have considered these sensors, but the price is the main problem and it might be overkill. I only need to know whether the flower pot is staying on surface or being picked up.
What do you think about it? Is there any suggestion?