Capacitive sensors are looking at capacitance of a material, everything has this not just living things. You can for example get capacitive sensors for sensing the presence of cardboard. This is also why water droplets mess up touch screens, because it’s close enough to the capacitance of a finger to trick it and create false triggers.
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CoolGirl586@lemmy.world 4 months agoOh, I did a dumb. Capacitive readers use the body’s natural electrical signal to form an image of your fingerprint. You can trick them by using something conductive and running the right amount of electricity through.
Dead people don’t work though. Not for very long at least.
Grippler@feddit.dk 4 months ago
piecat@lemmy.world 4 months ago
Capacitive sensors don’t measure the body’s signals. Capacitance is a physical property of a material. The sensor puts out a signal and measures the response.
I can use a gallon of milk to scroll my phone. Just tried.