Fan creation by IndominusRex18. BUTL3R is an autonomous robot that drives around your house and picks up your dirty laundry. Nobody wants to go around and pick up their dirty socks or shirts. Just let BUTL3R do the work for you. With the aid of an ultrasonic sensor, BUTL3R navigates his way through your house and picks up your dirty laundry with his dual conveyor belts. BUTL3R uses one EV3 brick and four motors as well as one ultrasonic sensor.The top conveyor belt has a pivot system so it can raise to fit larger clothes. BUTL3R is an entry from the LEGO® Rebrick Superbots contest.