Roomba creator responds to reports of ‘poopocalypse’: ‘We see this a lot’
theguardian.com
theguardian.com
Rough ideas: detect moisture in material. If soemthing 'wet' is detected on the bumper, halt. Just halt. It isn't worth it.
Otherwise, would need to have the ability to shampoo/wetvac, and that's something I don't think would work in a tiny device.
A poop is probably capacitive, you could detect it without even touching it.
My second thought:
What else has capacitive sensors and how could I test this theory?