Any type of prototype would be progress. ANYTHING. A toilet roller sensor IOT device would be okay with me. NUNCHI could figure out how my sits vs. rolls needed over a period of time.
AS soon as the roll gets low, a signal is passed up onto the 'cloud' and the maintenance worker get notified on their handheld device to install a new roll.
I was / am going to develop a water sensor device that would trigger an alarm that I could manage from anywhere when my neighbor floods me with his irrigation water.
Just think about setting off an alarm for your house when you are thousands of miles away. The police would show up and you could set off another alarm. These alarms would be solar powered.
I started working with the Arduino processor back in February. But got pulled into other directions. https://www.arduino.cc/