GLOBAL POSITIONING

& DATA LOGGING

Arduino 101 // Further Techniques

// Ben Freeth

// 080314

THE WATCH

20 WAYS TO FIND YOUR LOCATION?

What are these?

20 WAYS TO FIND YOUR LOCATION?What are these?• Assume: the Earth. Or, smaller domain, but assume that’s the largest space you have to

look in• Use the time• Ask someone• Association: who or what are you near?• Proximity to phone boxes, public transport stops and utility markings• Use a map• Which cell/public phone operators are available?• Phone number syntax• Newspapers available• Languages being spoken• Street names• Street corners / intersections• Street numbers• Business names• Mobile phone location (triangulation / triliteration)• Triangulation / Triliteration on other radio infrastructures e.g. TV, Radio, Public Wi-Fi• GPS, assisted GPS, WAAS, and other GPS enhancements• Landmarks and “littlemarks”• Dead reckoning

ARTHUR C CLARKE

August 1956: GPS prognostication // A network of geosynchronous satellites circling the globe

THE MULTIPATH EFFECTPhantom Beacons

TRILATERATION VS TRIANGULATION

Determining Position – distance is only part of this (1D)

GPS

What?

What?

GPS - RXReceivers

GPS – SERIAL PROTOCOLNMEA 0183 protocol

Serial Protocol

4800 bits per second (Baud Rate)

8 data bits

No parity

1 stop bit

Send via RS-232 or TTL serial levels

GPS - LOGSData in the NMEA protocol

GPS - LOGSData in the NMEA protocol

GPS - LOGS$GPRMC,15525.000,A,4043.8432,N,07359.7654,W,0.10,11.88,200407, , *20

Message Identifier

Time (GMT)

Status of data (valid = A, not valid = V) (Active, Void)

Latitude

North South Indicator

Longitude

East/West Indicator

Speed Over Ground

Course Over Ground

Date

Magnetic Variation

Mode

Checksum

ADDRESS 2007Mouna Andraos & Sonali Sridhar

REVERSE GEOCACHEhttp://arduiniana.org/2009/10/the-reverse-geocache-puzzle/

Blast Theory (2004)UNCLE ROY ALL AROUND YOU

PLAN B

10 Year Map Of Berlin Soul gpx track on openstreetmap background showing 3-day trip to UK and path of soul

Soul Walker

PSYCHOGEOGRAPHY

"the study of the precise laws and specific effects of the geographical environment, consciously organized or not, on the emotions and behavior of individuals.”

"a whole toy box full of playful, inventive strategies for exploring cities... just about anything that takes pedestrians off their predictable paths and jolts them into a new awareness of the urban landscape."

OPEN POSITIONING SYSTEMPhilipp Ronnenberg

Maps as power….

http://www.openps.info

ADAFRUIT GPS-165 dBm sensitivity, 10 Hz updates, 66 channels

Low power module - only 20mA current draw, half of most GPS's

Assembled & tested shield for Arduino Uno/Duemilanove/Diecimila/Leonardo MicroSD card slot for datalogging onto a removable card

RTC battery included, for up to 7 years backup

Built-in datalogging to flash

PPS output on fix

>25Km altitude

Internal patch antenna + u.FL connector for external active antenna

Power, Pin #13 and Fix status LED

Big prototyping area

ADAFRUIT GPSDirect Connect- Soft Serial selected- Bare Minimum Sketch

- Use the serial monitor to look at the raw strings- 9600 baud

ADAFRUIT GPS

Need – Adafruit_GPS library

https://github.com/adafruit/Adafruit-GPS-Library

Leo Echo (test this sketch)

SoftwareSerial mySerial(8, 7); // Make sure these are set in the code

Find the line about the Uno – uncomment the line recommended

Look at SoftwareSerial on Arduino.cc to understand what it does:

http://arduino.cc/en/Reference/SoftwareSerial?action=sourceblock&num=1

All data? Or just some of the NMEA sentences?

Logging – need SD library (give them yours) // they have this

shield_sdlog (arduino ino file to use to log data)

GPS DATA ACQUISITIONGo and collect some data

PLOTTING GPS DATAhttp://www.gpsvisualizer.com

CONCLUSION

In summary:

You should now have

a good understanding of

creating interactive projects

that utilise GPS for locating where someone or

something is

HOME WORK• Pick a location• Write code to determine how far you

are away from this location using GPS• Display this data on an lcd screen

• Try out the TinyGPS++ library• Specifically the courseTo() function

(should enable autonomous route finding)

• Teach yourself to write functions in Arduino IDE – there are many online resources for this

Parsing Data Processing Open Office Excel

.kml files Google Maps // Hamster Map

Extending this Drone UAV // unmanned flight Waymarkers // missions

Gps in wearables… context location aware… - papers about this??