Harvey White <[email protected]> wrote: > >3. What is the "normal" way of using the BBB analog inputs with 5V levels? > > Is it possible - or is there where I would use a level-shifter or zener > >diode? > > Level shifters are generally digital, and zener diodes don't help all > that much (and are not really a good idea here). My standard advice > would be to run the analog voltage through a non-inverting op amp > configured as a gain stage. You run the op-amp (and have to pick one > that does rail to rail and also runs from 1.8 volts) from the 1.8 volt > supply. > Yes, that's what I do. There are quite a few very low power op-amps suitable for running from the 1.8 volt rail on the BBB. If OP is interested I can look up the device, it's from TI if I remember.
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