Bad at Electronics

Presentation Overview

What is the Raspberry Pi?
Basic Circuits n LEDs
Basic Raspberry Pi
CoffeeBoard Hardware/Code

What is the Raspberry Pi?

Operating System?

Those blinky lights!

ACT – D5 (Green) – SD Card Access
PWR – D6 (Red) – 3.3 V Power is present
FDX – D7 (Green) – Full Duplex (LAN) connected
LNK – D8(Green) – Link/Activity (LAN)
100 – D9(Yellow) – 100Mbit (LAN) connected

Setting up your Raspberry Pi

Beginning the Pi

Format your SD card - FAT

Copy OS to the card - I used NOOBS/Raspbian

http://www.iconoclastlabs.com/blog/ruby-on-rails-on-the-raspberry-pi-b-with-rbenv

GPIO Pins

Artoo

Raspberry Pi

Board Numbering vs. Broadcom SOC channel Numbering (aka BCM Numbering)

BCM and Board of B+

Code Driven GPIO

Python
C
Artoo
Cylon.js
Gobot

Simple LED

Light Emitting Diode

Common LEDs have a 2V drop & light up with 4mA of current.

Ohm's Law

Connecting the LED to 5V, means 3V are being passed through to ground.

Ω

V = IR

V = I R

R = \frac{V}{I}

R = \frac{​ V ​ ​}{​ I ​}

R = \frac{3}{.004}

R = \frac{​ 3 ​ ​}{​ . 0 0 4 ​}

R = 750

R = 750

All Set Up!

Close enough!

Code Driven LED

Pibrella!

PiGlow

LED Matrix

Commonly with RGB LEDs

Line up Anodes and Cathodes into Rows and Columns

+transistors
+multiplexing

CoffeeBoard Hardware

Everything(ish)

$5.50 - Bronze Chain
$5.99 - Rasp Pi Power
$38.44 - Rasp Pi B+
$17.85 - Zebra Wood Case
$24.95 - 16x32 Display
$7.95 - 5V 2A Power
$3.95 - F/F Jumpers
$3.95 - M/M Jumpers
$2.00 - 2.1mm DC adapter
$15 - Wood Stain
$13 - Polyurethane Sealant
$17 - Carved Wood Board

$155.58

CoffeeBoard Code

The GPIO Software

VS

PPM?

# Get info
info = `identify colorbar.png`.split
#=> ["colorbar.png", "PNG", "168x64", "168x64+0+0", "8-bit", ...

info[1] # normalized and identified file format, like PNG etc.
info[2].split("x")[1] # Image height in pixels

# Convert to PPM and set height to 16px
`convert awesome.jpg -resize x16 awesome.ppm`

Ruby Running Commands