If you are getting analog signals into digital circuits there is quite a bit more to know. Sensor characteristics, signal conditioning and level shifiting, anti

If you are getting analog signals into digital circuits there is quite a bit more to know. Sensor characteristics, signal conditioning and level shifiting, anti-aliasing, grounding, input protection, circuit layout, power supply effects. Arduino For Scientific Measurement covers many of these in a straightforward, somewhat chatty way, for low frequency and DC signals. It's by a guy who has done a lot of well/bore measurement for the oil and gas industry and it is very focussed on the practice--there's no theory at all (except a very brief qualitative sketch of an ADC, IIRC). Radio frequency is a whole other kettle of lobsters. Lots more to learn there.