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This test application is created for testing/demonstrating the BH1750FVI driver. It uses the default device parameters as specified in drivers/bh1750fvi/include/bh1750fvi_params.h. To override these setting, you can simply do this by defining these parameters as compiler flags while uilding, e.g.:

$ CFLAGS="-DBH1750FVI_PARAM_I2C=I2C_DEV(1)"" make all


Simply flash this example to your board and it will read the sensor value 5 times per second and print the sampled value to STDIO. You can verify the values by simply covering the sensor or holding it in front of a bright light and see the change in the sensor readings accordingly.