Battery powered projects have a limited amount of energy, so you have to decide how to allocate it. This tutorial will show you how to make sense of that.
Choosing an ADC
How the garbage-in/garbage-out principle applies to analog circuits.
How to Choose a Microcontroller
'Best' means more than 'newest, biggest, and fastest'. Today there are some great microcontroller boards to realize your ideas. This guide will help you look at choices available and help you decide on the right microcontroller for your implementation.