he has a couple names: "little guy; wall•e (unofficial); density nano"
but what he's made of is two infrared distance sensors. measures ingress and egress.
but what he's made of is two infrared distance sensors. measures ingress and egress.
1 sensor... ingress = movement into one area out of an adjacent area. Simultaneously, that counts as an egress (that person having moved out of that adjacent area into the next).