The objective of this
project is to build a one wheel skateboard that could go forward
and backward with the help of a gyroscope and accelerometer by
shifting weight on the board. We wanted to build something
useful and fun for the user.
Circuit Design and
Component
The main electrical
components of the circuit are: the open source motor controller,
the arduino microcontroller, the gyroscope, and the DC motor
(Brushless, 24 V, 0.70 Hp, 4000 rpm). The main mechanical
components are: go kart wheel, bearing, sprockets, chain, hubs,
axel, steel sheet metal (frame) and angle irons. Since the logic
of our project is too complicated, we had no choice than use
programming instead of logic gates.
Features
The board does not start
until it is leveled first. If you tip too far the motor will
automatically stop and will not restart until it is leveled
again. The Segboard is rechargeable. If you lean forward the
board will advance and the same if you wish to go backwards with
the speed as a function of the tilt angle.
Problems Encountered
For
certain reasons we are not able to connect both batteries to the
OSMC without causing fire or smoke so we still have some
investigation to do in order to identify the reason. As a
result, our motor does not have enough power to move with an
adult on it but it does have enough to level itself.
As for
the calibration and getting the board to level itself out the
chain is still a little loose resulting in less accurate
response from the motor. Also, since our board has to be level
before being operational this small window is not included in
the response resulting in jerks instead of a smooth motion.
A
top and a sideview of the segboard. The top has been removed to
show the inside.
What we Learned?
In
general, we learned a lot about mechatronics, how to weld,
solder, and program a microcontroller.
Conclusion
When we started this project, we knew it was a great challenge
and we did not want to make a small scale project. We aimed a
useful project that covers most of the mechatronics elements (
mechanical, electrical, software). We implemented a lot of logic
through software so the user will not have to press any button
to start the board and the board will be safe to use. We are
convinced that the Segboard will be more pleasant to ride if we
make it lighter (alluminum frame) and implement a stronger motor
( more Watts or HP ) but we were limited in funds.
