Crossing Signal

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The crossing signal is a simple implementation using the PCA9635 LED driver.  Using the PWM signal from the PCA9635, you can control the brightness of the LED.  Using a resistor in series with the LED allows you to set the duty cycle to 100% (full brighness), without worrying about burning out the LED's.  

Basic instructions:

There's a utility program in the driver examples, but it does not control the OE pin on the txs0108e, so you'll need to set it manually before running the utility program.