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Arduino Lap timer base for Race Coordinator
#7

The Arduino will perform perfectly well using the 5 volts provided via the USB cable. An external power supply would only be necessary if you are running lots of LEDS from the Arduino.  I have two 5volt relays plus the five start lights running happily.  
For the LEDs in the "Light Bridge" I power those from a separate USB socket.

Your Arduino is missing the usual power socket that is provided for using an external power supply.

   

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