Welcome to Week 5 at the

Summer Computer Club

GPS and Geocaching

Homework – Week 4• Build a 3 bit binary display using Red, Green, Blue LED’s. • Requirements

• Request user for a number between 0 and 7 (All others should be appropriately rejected)• Convert number to 3 bit binary format. • Display Most Significant Bit as Red, Middle Bit as Green and Least Significant Bit as Blue.

(Ex: Number 5 would convert to Red:On, Green:Off, Blue:On and the number 4 would convert to Red:On, Green:Off, Blue:Off)

• Three things needed for homework to be complete• Circuit Diagram – One is enough, which will be the same for all 3 LED’s. Use resistor of 10K

ohms in the diagram. • Bread board connectivity diagram.

– Ground is on 3H. – Pin 18 (Red LED) is on 6H– Pin 23 (Green LED) is on 8H– Pin 24 (Blue LED) is on 9H– Cobbler spans from Row 1 to Row 15.

• Python Code to display the LED’s.– Initially as a test use prints to display which LED’s would be on and off.

What is GPS?

• Historically complements Maps and compasses

• Global Positioning System– 24 satellites orbit the earth twice a

day– A GPS receiver locks onto signals from

three or more satellites to determine your location, using a method called trilateration.

– The GPS receiver calculates the difference between the time a satellite sent a signal and the time your system received it. Using the information gathered from several signals, the receiver triangulates your exact position. It can even determine how fast you're going and how long it will take you to reach your destination

GPS terminologies

– Point on earth represented using Latitude, Longitude, Altitude (http://www.mapcoordinates.net/en)

– Waypoints: are sets of coordinates that identify a point in physical space

– Tracks (bread crumbs) – path traveled by you (GPS)

– Route (a series of waypoints) in the path to be followed

What is Geocaching?

• Geocaching is a real-world, outdoor treasure hunting game using GPS-enabled devices. Participants navigate to a specific set of GPS coordinates and then attempt to find the geocache (container) hidden at that location (http://www.youtube.com/watch?v=-4VFeYZTTYs)

• Selecting our first geocache (http://www.youtube.com/watch?v=QI_JKetfKNU)

• Finding your first geocache (http://www.youtube.com/watch?v=1yMMyj3vTvE)

How to get started with geocaching

• Download an app to a GPS enabled mobile phone (http://www.geocaching.com/live/default.aspx )

• GCCode to identify your geocache

• How do I place a cache? (http://www.geocaching.com/about/guidelines.aspx)

• Today we will explore the following caches:– Kids Cache 2– Bank In It

Geo technologies

• GIS – is a system designed to capture, store, manipulate, analyze, manage, and present all types of geographical data (ex: Imaging/Maps)

• GPS - is a space-based satellite navigation system that provides location and time information in all weather conditions, anywhere on or near the Earth where there is an unobstructed line of sight to four or more GPS satellites. (ex: Navigation)

• Geo-tagging – is the process of adding geographical identification metadata to various media such as a geotagged photograph or video, websites, SMS messages, QR Codes[1] or RSS feeds and is a form of geospatial metadata.

• Remote Sensing - Remote sensing is the examination or the gathering of information about a place from a distance. Such examination can occur with devices (e.g. - cameras) based on the ground, and/or sensors or cameras based on ships, aircraft, satellites, or other spacecraft. (Ex: Radar. Its most important uses are for air traffic control and the detection of storms or other potential disasters.)

Homework – Week 5

• Come up with list of caches that we can go to on Friday. Use the Geocaching site (you only need a login for lat/lon)

• Continue to work on past projects that are still remaining