Example with reading voltage via SPI

[David-OConnor]

Could we add an example of how to read a voltage, for example an analog sensor input connected to a SPI ADC? I'm trying to do this, but am getting [0, 0, 0, 0, 0] using the SPI example. (Confirmed not a hardware or setup problem)

[crjeder]

You could have a look at my hx711_spi crate