Plug-In Time Piece, Prototype 1

Notes for Class:
Resistor Calc.
http://www.engplanet.com/content/resistorinfo.html

LED Formula:
http://www.bpesolutions.com/ledcalculator.html
LED Calculator:
One LED
http://led.linear1.org/1led.wiz
Series LED
http://led.linear1.org/led.wiz

Led Specs:

http://www.LedShoppe.com

Notes for Class:

Current limiting series resistor formula:
vIN – vLED / 30 milliamp = series current limiting resistor.

((5V – 3V) / 0.030) = 100 Ohm series resistor for
a 5V supply.
((6V – 3V) / 0.030) = 100 Ohm series resistor for
a 6V supply.
((9V – 3V) / 0.030) = 200 Ohm series resistor for
a 9V supply.
((12V – 3V) / 0.030) = 300 Ohm series resistor for
a 12V supply.

Change the mA to 0.020 if using a 20mA LED

Assignment
Read
1)  Chapter 1-4 in CODE

2)  Cradle to Cradle Design, 20mins

http://video.google.com/googleplayer.swf?docid=-6397457103509501840&hl=en&fs=true

3)  http://www.tigoe.net/pcomp/code/understanding-electricity

Make
Enclose your time piece so it can be:
Displayed by plugging into wall.
Has room for adding 3 switches to the outside.
Has a way to program it easily [possibly an opening].
Shows the passage of time with light.

On Blog Post:

1 sketch on Blog. Place 1 Photo of board, 1 Photo of Project (enclosed), code, and optional Video.