drive motors with a battery, it was time to figure out how
to attach them to the Heineken can.
Trying to mount things evenly on a round can gave me
a few things to think about. How was I going to measure
all of the places I needed to drill the holes? After some
pondering, I used a pocket tape measure that was very
flexible. I could wrap it around the can to take
measurements and mark the places for the holes. I also
wrapped some blue painter’s tape around the can to give
me some straight edges to work from. The printed decal on
the Heineken can has a star in the
center of it, so I used its center line
to work from, as well.
Once I found the positions for
the shoulders, I attached them with
a couple of number 8 sheet metal
screws. One thing I learned about
Heineken cans is they are incredibly
thin walled and not easy to drill
through without tearing. The drive
housings are attached to 1-1/4”
angle aluminum that bolts to the 3”
aluminum flat bar that acts as
Beer2’s legs. They attached to the
shoulders using several number 8
sheet metal screws. The front wheel
housing is attached using 1-1/4”
angle aluminum connected to
another piece of 3” flat bar,
connected to yet another piece of
1-1/4” angle aluminum.
Test Run and the
Once I had it all bolted
together, I put the batteries, speakers, and electronics in
and set it on the floor. It fell over. Ah dang, I had a center
of gravity problem. I went back and watched the real R2D2
in the movies, and noticed that he actually leans back a bit
when he is rolling around. Ah ha! Better building through
watching sci-fi movies! I had to reposition/tilt Beer2D2’s
main body back until he became stable.
After all of that, I finished the four battery power
switches, motor, speed controllers, radio receiver wiring,
and took him for an R/C test drive. Yay, he works! It was
now time to give Beer2D2 a little personality, so I
connected his 12 VDC 2,000 mAh battery pack to a switch
mounted in the can, connected the amplified speakers, and
added an Apple iPod Shuffle for an audio source.
I also mounted a stock servo to another piece of 1”
angled aluminum and found the inside center of the
stainless steel mixing bowl by carefully balancing it on a
Sharpie pen to mark the spot where I drilled the 1/8” hole
for the servo motor’s center shaft screw.
48 SERVO 08.2015
Amplifier and power supply.
A Beer2D2 fan.
Jameco LED color organ —
now in kit form!
A much simpler and smaller
LED color organ from
The Easy LED Color Organ
Vantec speed controllers