2.1.5v AAA batt.
5. DIY .
if you use a 3 v Li batt.(2032) instead of 1.5 v.
and cutout 3 cm roller then you could make
a kitty's running mini-mouse.
Step 1: Material
aluminum-foil roller * 1
foam * 1
dc-motor * 1
AAA battery * 1
Cotton swabs * 1
cutter * 1
Step 2: Cutout the Aluminum Foil Roller
use cutter to cut out a 8 cm small roller as the robot body.
Step 3: Connect 2 Copper Wire From Motor to AAA Batt
connect 2 copper wire from motor to AAA battery.
cut the foam into some slices.
fill the foam into the roller between battery.
fill the foam into the roller between dc-motor.
Step 4: Make the Power-crowbar
use cutter to cutout the crowbar, just cut 80%.
do not cut the cotton head off !
and then connect to the dc motor's shaft.
Step 5: Test Run
HAVE FUN !
runs pretty fast !
about 1.5 M per second.