Pi + JavaScript
April 12, 2016
https://github.com/idcrook/rpi-hw-js-demo
David Crook
Hardware
The place where code runsConnected to the physical world.
Single Board Computers
| SBC | Price |
|---|---|
| Raspberry Pi Model B+ | $25 |
| Raspberry Pi 2 Model B | $35 |
| Raspberry Pi 3 | $35 |
| Raspberry Pi Zero | $5 |
Many more exist...
Why Raspberry Pi exists
“The idea behind a tiny and affordable computer for kids came in 2006, when [the people behind the Pi] became concerned about the year-on-year decline in the numbers and skills levels of students entering Computer Science at University.”
Paraphrased from Raspberry Pi Foundation - About
Why is it called Raspberry Pi?
"[W]e wanted a fruit name for nostalgic reasons, and the Pi comes from Python" (the programming language) ~ Liz Upton
Raspberry Pi is a trademark of the Raspberry Pi Foundation
Pieces of Pi
The Pi's in front of you are model B+ or model 2 B
- Connected to 5 watt power supply
- Connected to wired Ethernet
- Running Raspbian OS (Debian Linux) on µSD card
- 40-pin expansion header provides many kinds of I/O ports
- We are going use some of these today!
Pi Board (B+)
Pi Board (2 B)
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Does it work?
http://rpit5.local:3000
Web Interface
Why node.js
Node.js JavaScript server running on the Pi
- single-threaded, event-driven programming model
- makes it good for low-level programming in many ways
- resource usage is low
- fast, even on a tiny computer
Hands-on Portion
- Wire it up
- Serve it up
- It's alive!
- Profit
Wire it up
Wiring diagram
Hands-on Demo Pt. 1
open -a Marked\ 2 demo_notes/demo1.mdDEMO Pt. 2
open -a Marked\ 2 demo_notes/demo2.mdEnhancements
- Authentication and Authorization
- Only trusted users can do allowed things
- Rate limiting and other checking
- Hardware has real-time and real-world constraints
- Color calibration
- Tweak circuit parameters to resemble color scales
- Make it a thing or appliance!
- Connect to an external service or control other things
- Hacking it
- What else can you think of?
Thank you for (not) smoking
David Crook <idcrook@idcrook.com>
Twitter: @idcrook
Github: @idcrook
Blog: github.crookster.org
Pi + JavaScript
April 12, 2016
https://github.com/idcrook/rpi-hw-js-demo
David Crook
@idcrook
idcrook@idcrook.com