Can anyone help me create an alarm for the truck's diesel tank? Is there something like a linear alarm with a radius of 3 meters long and 40 centimeters of detection width? In order to detect a movement on the fuel filler tank or on the hoses in the tank?
My guess he wants to know before the level goes lower.
Drilling holes in the tank will certainly void a warranty.
How about security camera and with alarm output based on motion in specific area
I was in the same boat of requirements. Have not found any sensor as such that does the job. While searching I found out this sensor (https://www.ebay.com/itm/254206672470). Dont know if anyone has tried it?