#------------------------------#
|                              |
| Underspeed Chrono Light v1_0 |
| 11.12.2012                   |
|                              |
#------------------------------#


Set AVR clock to external crystal.


LED:
----
Any IR (infra red) LED.
Best under 60 degrees


7 segment LED display: 
----------------------
common cathode, common sticks.
For example:
KINGBRIGHT ELECTRONIC BC56-12SRWA
http://www.tme.eu/hu/details/bc56-12srwa/harmas-led-kijelzok/kingbright-electronic/#


Phototransistor:
----------------
Many type working well.
I tested BPW17 and SFH309FA phototransistors.


PCB size:
---------
81mm x 85mm

