Function mraa_sys::mraa_aio_read_float

pub unsafe extern "C" fn mraa_aio_read_float(dev: mraa_aio_context) -> f32

Read the input voltage and return it as a normalized float (0.0f-1.0f).

@param dev The AIO context @returns The current input voltage as a normalized float (0.0f-1.0f), error will be signaled by -1.0f