Arduino & Raspberry Pi
Special Interest Group
Presents…
Platforms
March 5, 2015
ARDUINO
PLATFORM
Designer: Dan Simpson, AE7IH
Designer: Chuck Zappala, KE7SA
The Arduino Platform
• Micro-controller
• Many types, scalable
• Programmable, IDE - Integrated Development
Environment
• Analog & Digital I/O
• I/O add on components
• Add on circuit boards (Shields)
• Open source hardware and software
• Low cost, typically less than $40
• Available through many outlets
Arduino Types and Sizes
Arduino Uno Version 3
Very Large Assortment of Sensors
Many Development Kits
An Arduino Shield (add on board)
adding Bluetooth Wireless Capability
Shields and Modules are Stackable
Interactive Development Environment
Standard Libraries
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EEPROM - reading and writing to "permanent" storage
Ethernet - for connecting to the internet using the Arduino Ethernet Shield
Firmata - for communicating with applications on the computer using a standard
serial protocol.
GSM - for connecting to a GSM/GRPS network with the GSM shield.
LiquidCrystal - for controlling liquid crystal displays (LCDs)
SD - for reading and writing SD cards
Servo - for controlling servo motors
SPI - for communicating with devices using the Serial Peripheral Interface (SPI) Bus
SoftwareSerial - for serial communication on any digital pins. Version 1.0 and later
of Arduino incorporate Mikal Hart's NewSoftSerial library as SoftwareSerial.
Stepper - for controlling stepper motors
TFT - for drawing text , images, and shapes on the Arduino TFT screen
WiFi - for connecting to the internet using the Arduino WiFi shield
Wire - Two Wire Interface (TWI/I2C) for sending and receiving data over a net of
devices or sensors.
Controlling a Stepper Motor
Fritzing Diagram
C++ Code is called a “Sketch”
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// Controlling a servo position using a potentiometer (variable resistor)
// by Michal Rinott <http://people.interaction-ivrea.it/m.rinott>
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#include <Servo.h>
Servo myservo; // create servo object to control a servo
int potpin = 0; // analog pin used to connect the potentiometer
int val; // variable to read the value from the analog pin
void setup()
{
myservo.attach(9); // attaches the servo on pin 9 to the servo object
}
void loop()
{
val = analogRead(potpin);
// reads the value of the potentiometer (value between 0 and 1023)
val = map(val, 0, 1023, 0, 179); // scale it to use it with the servo (value between 0 and 180)
myservo.write(val);
// sets the servo position according to the scaled value
delay(15);
// waits for the servo to get there
}
Parts and Resources
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Adafruit.com
arduino.cc
Yourduino.com
tronixstuff.com
opensourcehardwaregroup.com
ARDUINO IN ACTION
Designer: Russ Sherwin, AD6ZL
Demonstrating a Few Ideas for Arduino
1. Two Arduinos, one passing data to the other
2. Use of various color displays
3. Implementation of a touchscreen display
4. How Arduino and custom PCB can be stacked
5. Use of interrupts; the dual function generator is entirely
interrupt driven. The LOOP statement is empty
6. An optically isolated (to 500v) RS-232 link
7. Using Arduino to pass data to PC USB port
8. Using PC to display data in lieu of or in addition to the
small color displays.
Function Generators, Two Versions
• Top: Dual
Function
Generator with
touchscreen
based on
Arduino Mega
• Bottom: Early
single output
version, LCD
screen using
Arduino UNO.
Arduino-based Function Generator
• Based on an Arduino Mega, this incorporates a touch
screen front panel to control two separate function
generators, each capable of sine, square, triangle wave
generation from sub-Hz to about 13 Mhz. Two custom
designed PCBs are used for the frequency generation;
the Arduino does all of the touch screen work.
• Since the generators are completely independent, one
can be used to modulate the other in either AM or FM
mode.
• In addition, it has external inputs that can be used to
measure and display frequency.
Function Generator, Inside view
• Board stack:
Arduino
Mega left;
two sig gen
boards, then
touchscreen
display
board.
Solar Monitor Display
• Based on a 5”
800 x 480 pixel
display, this
system uses two
“Ardweeny”
modules, one for
measurement
and the other for
display
management
linked by RS232
Solar Monitoring System A/D & Amps
• This is the
measurement
end. It does the
A/D conversion
and ships the
result over to
the display end
via RS-232. It’s
optically
coupled for
isolation.
Solar Monitoring System Display
• The display
end showing
the back of
the display
driver board
and the
display logic
PCB with the
“Ardweeny”
in the lower
right.
Solar Monitoring System, PC Display
• This is more or less
the same display
running on a PC
using Processing 2
language, similar to
Visual Basic. The
Ardweeny passes
data to the PC via
USB. Both displays
can run
simultaneously and
output data to an
Excel file.
RASPBERRY PI
PLATFORM
Designer: Tom Azlin, W7SUA
The Raspberry Pi Platform
• Low cost credit-card sized computer
• Uses various Linux based kernel OS, on board, GUI
• Uses ARM1176JZF-S (ARMv6k) 700 MHz CPU, system on a
chip
• 256 MB up to 512 MB
• Uses an external computer monitor, keyboard and mouse
• Needs a 5 volt micro USB power supply
• Uses the Scratch, Python, C, C++, Java, and Ruby languages
• Does just about everything a full PC does
• Driver APIs for expandability
• Costs typically less than $40
• Widely available through many outlets
The Raspberry PI Model B+ Board
The Raspberry PI Model A Board
The Raspberry PI Compute Module
Connections
I/O Pins
Demos
• R-Pi Digital Voice Hotspot using DV Adapter
– 10miliwatt UHF transceiver
– AMBE VOCODER not needed
– Works with 1600 ircDDB and US Trust repeaters
• R-Pi DVB-T GNU VHF-UHF Receiver and Spectrum
Display (show)
• R-Pi Digital Modes Terminal with fldigi (show)
– Used either USB SignaLink or Sound daughter card
• R-Pi Digital Voice MODEM (show)
– AMBE Daughter Card
R-Pi based D-STAR Hotspot
Software Defined Receiver!!!
…and it works!!!
Smaller Version
R-Pi Links for Further Reading
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www.raspberrypi.org – Main Site
http://www.raspbian.org/ - R-Pi optimized Debian
http://www.elinux.org/RPi_Hub - Information on R-Pi
http://dvmega.auria.nl/ - Plug in radios
http://maryland-dstar.org/ht ml/raspiberry.html - using radios
http://www.canakit.com/raspberry-pi getting an R-PI
https://groups.yahoo.com/neo/groups/Raspberry_Pi_4Ham_RADIO - R-Pi ham radio apps
http://www.irlp.net/pi/ - R-Pi based IRLP node
http://villazeebries.krbonne.net/hamstuff/?p=341 EchoLink R-Pi
node
http://garethhayes.net/gnu-radio-for-raspberry-pi/ using DVB-T
dongle for a Pi Radio
http://www.ultratechie.com/2012/10/pigate/ - APRS
Thanks for attending our presentation!
Stop by at our demo table to see our projects
up close and ask questions.
The SIG is welcoming new members to help
you get started and share information and
ideas.