Pine Wood Derby Track Build Step 5

Building the timer and electronics.
Using photo diodes, Arduino, led matrix and 7 segment displays.
Arduino code
github.com/dez...
Adafruit_LEDBackpack.h
Adafruit_GFX.h
LedControl.h
Both of the Adafruit libraries can be found on their site learn.adafruit...
the ledcontrol.h is part of arduino playground.ardu...
For more information on the wiring setup:
• Pine Wood Derby Arduin...