The initial project, and certainly the one to which many were inspired is that of Doug Jackson.
http://www.instructables.com/id/The-Word-Clock-Arduino-version/
also inspired by
http://www.highonsolder.com/blog/2011/1/8/arduino-word-clock.html
http://www.instructables.com/id/Sleek-word-clock/
Step 1: The Materials
The list of materials for the board depends on how you plan to make the electronics, if you want an Arduino standalone or an Arduino UNO or 2009, however, this is what I used.
Step 2: 1) The Materials- LED and resistor
To realize the proposed scheme are needed:
98 White LED
98 Resistor 470 ohm
Why 470?
I chose these resistors for this reason:
LED (ultrabrightness white) http://www.robot-italy.com/product_info.php?products_id=421 forward v is 3,3v and 25ma
,the clock will run to 9v and i want that the led will be drived at half current 12,5ma (no needs too much brightness), so:
(9-3,3)/0,0125= 456, correct misure is 470 ohm resistor.
Step 3: 2) The Materials -Standalone Arduino
On the web and on Instructables you will find several examples , these are the materials I used for my own PCBs, I plan to switch directly the ATMega 328 bootloader included with that my own Arduino UNO.
-2 ceramic capacitor 22pF
-quartz 16 mhz
-2 elettrolitic capacitor 100 nF
-5v regolator voltage 78L05
-1n4007 diode
Step 4: 3) The Materials – Integrated
3- HCF4094 shift register
4- ULN2003A Driver
ATMega 328 with bootloader
Step 5: 3) The Materials – other electronic part
-2 micro button to set hours and minutes
-a supply voltage coaxial connector
-a flat wire 26 wire with connector
-two-pole connector
Step 6: 4) The Materials – remainder
-IKEA Ribba frame
-carboard light, color you want to make passpartout
-cartonboard thicker to make LED holder
[box color=”#985D00″ bg=”#FFF8CB” font=”verdana” fontsize=”14 ” radius=”20 ” border=”#985D12″ float=”right” head=”Major Components in Project” headbg=”#FFEB70″ headcolor=”#985D00″]Arduino
98 White LED
ATMega 328[/box]
For more detail: My Arduino WordClock
