iio {#iio} === IIO is the kernel's framework for supporting sensors. You may need to recompile a kernel and add, this is from kernel 4.2: CONFIG_IIO_DUMMY_EVGEN=m CONFIG_IIO_SIMPLE_DUMMY=m CONFIG_IIO_SIMPLE_DUMMY_EVENTS=y CONFIG_IIO_SIMPLE_DUMMY_BUFFER=y ## 'RAW' access Mraa supports raw access ###Channels ###Attributes ###Events ###Triggers Activate the trigger in /sys/class/iio $ echo 1 > trigger0/trigger_now ## Testing without hardware Create a dummy iio device $ modprobe iio_dummy Create a dummy iio event generator $ modprobe iio_dummy_evgen