small bots, using ATtiny85, Lipo Cell, miniature motors and a couple of sensors.
inspired/copied from: http://hackaday.io/project/581-Tiny-robot-family
ATtiny85 from: http://www.aliexpress.com/item/Free-Shipping-10PCS-Original-Integrated-circuit-parts-ATTINY85-ATTINY85-20SU/827307420.html Motors from: http://www.aliexpress.com/item/5pcs-4-2V-46000RPM-6x14mm-Coreless-DC-Motor-Strong-magnetic-high-speed-for-helicopter-model-aircraft/1679522733.html
MOSFETs: 2N7000 bought from local shop VeroBoard: local shop Wheels: sections cut from glue gun stick... :)