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Drive Your Code
Building an RC Car by Writing Only Ruby
Hayao Kimura
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About me
Hachi (Hayao Kimura)
X: @hachiblog
Web Application Engineer at freee K.K.
Co-Founder of Kyobashi.rb. (Osaka)
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May 15th - 17th, 2024
NAHA CULTURAL ARTS THEATER NAHArt, Okinawa, Japan
Do you think you can build an
RC car just by writing Ruby?
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May 15th - 17th, 2024
NAHA CULTURAL ARTS THEATER NAHArt, Okinawa, Japan
I made it!
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May 15th - 17th, 2024
NAHA CULTURAL ARTS THEATER NAHArt, Okinawa, Japan
Demo
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May 15th - 17th, 2024
NAHA CULTURAL ARTS THEATER NAHArt, Okinawa, Japan
Demo
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May 15th - 17th, 2024
NAHA CULTURAL ARTS THEATER NAHArt, Okinawa, Japan
What are the annoying
aspects of electronic work?
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May 15th - 17th, 2024
NAHA CULTURAL ARTS THEATER NAHArt, Okinawa, Japan
Right, it's setting up the
environment.
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May 15th - 17th, 2024
NAHA CULTURAL ARTS THEATER NAHArt, Okinawa, Japan
But it's no longer
necessary for us Rubyists!
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How?
Picoruby
✦Ruby implementation for
one-chip microcontrollers
R2P2
✦Microcontroller framework
created with Picoruby
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How to use R2P2
Just three step
✦Download R2P2 uf2 file from R2P2 latest release
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How to use R2P2
Just three step
✦Download R2P2 uf2 file
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How to use R2P2
Just three step
✦Download R2P2 uf2 file from R2P2 latest release
✦Connect a Raspberry Pi Pico to the PC
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How to use R2P2
Just three step
✦Download R2P2 uf2 file from R2P2 latest release
✦Connect a Raspberry Pi Pico to the PC
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How to use R2P2
Just three step
✦Download R2P2 uf2 file from R2P2 latest release
✦Connect a Raspberry Pi Pico to the PC
✦Drag and Drop to install R2P2 on the Raspberry Pi Pico
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How to use R2P2
Just three step
✦Download R2P2 uf2 file from R2P2 latest release
✦Connect a Raspberry Pi Pico to the PC
✦Drag and Drop to install R2P2 on the Raspberry Pi Pico
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How to use R2P2
Just three step
✦Download R2P2 uf2 file from R2P2 latest release
✦Connect a Raspberry Pi Pico to the PC
✦Drag and Drop to install R2P2 on the Raspberry Pi Pico
That's it! Just write Ruby
code in an editor afterward.
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Controller Circuit
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Car Circuit
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I write such code:
Controller side
✦Read and send joystick values
Car side
✦Use the received values to drive
motors
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Controller code
Read Joystick voltage
Transmit joystick voltage values to the car
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Controller code
Read Joystick voltage
Transmit joystick voltage values to
the car
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Controller code
Read Joystick voltage
Transmit joystick voltage values to
the car
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Controller code
Read Joystick voltage
Transmit joystick voltage values to
the car
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Controller code
Read Joystick voltage
Transmit joystick voltage values to
the car
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Controller code
Read Joystick voltage
Transmit joystick voltage values to
the car
Of course, the JoyStick class and Twelite class are defined
beforehand.
The ADC and UART classes used within these classes are bundled
with PicoRuby, and you can use them simply by requiring them.
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Car code
Receive joystick voltage values from the controller
Calculate voltage of two motors
Update voltage of motors
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Car code
Receive joystick voltage values from the controller
Calculate voltage of two motors
Update voltage of motors
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Car code
Receive joystick voltage values from the controller
Calculate voltage of two motors
Update voltage of motors
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Car code
Receive joystick voltage values from the controller
Calculate voltage of two motors
Update voltage of motors
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Car code
Receive joystick voltage values from the controller
Calculate voltage of two motors
Update voltage of motors
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Car code
Receive joystick voltage values from the controller
Calculate voltage of two motors
Update voltage of motors
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Car code
Receive joystick voltage values from the controller
Calculate voltage of two motors
Update voltage of motors
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Car code
Receive joystick voltage values from the controller
Calculate voltage of two motors
Update voltage of motors
Similarly to the controller, classes
such as the Motor class and the
Receiver class are defined
beforehand.
PWM, UART classes are also
bundled in PicoRuby
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Install codes to Picos
When you place code as app.rb in the home
directory of R2P2, it will execute upon the startup of
the Pico.
Install the code for both the controller and the car on
their respective Picos.
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Install codes to Picos
When you place code as app.rb in the home
directory of R2P2, it will execute upon the startup of
the Pico.
Install the code for both the controller and the car on
their respective Picos.
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May 15th - 17th, 2024
NAHA CULTURAL ARTS THEATER NAHArt, Okinawa, Japan
This completes the RC car!
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May 15th - 17th, 2024
NAHA CULTURAL ARTS THEATER NAHArt, Okinawa, Japan
I was really able to do
microcontroller programming
just by writing Ruby! Applause!
🎉🎉🎉🎉🎉🎉🎉🎉
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Wrap up
PicoRuby and R2P2 are wonderful software
If you want to try out the RC car or read the code, please
come and talk to me!
The company I work for, freee K.K., has a booth set up. We
have code golf and accounting quiz, so please stop by!
(You might even be able to play with remote control cars!)
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May 15th - 17th, 2024
NAHA CULTURAL ARTS THEATER NAHArt, Okinawa, Japan
Enjoy electronics projects
with R2P2!