PX4 Writing i2c Driver Compile error

Writing a driver for PX4 using the i2c example. Im getting this error when I Make the file. Anyone know why this would be? Thanks,

Firmware/Build/px4fmu-v2_default.build/builtin_commands.c.o:(.rodata.g_builtins+0x2c): undefined reference to `TCS34725_

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Arduino PWM signal to Pixhawk

Hello, I'm trying to figure out how to send PWM signal to Pixhawk board to trigger a flight mode. I want arduino to, once data has been received from senaor arduino writes a PWM signal to Pixhawk and triggers a flight mode.Anyone have information on

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