Page 104 - Programming the Photon Getting Started With the Internet of Things
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Figure 5.4 Photon board analog pins.
The analog pins on the Photon will accept any voltage between 0 and 3V3. As
previously mentioned, because we are using a digital system, these values must be
converted into digital using something called an analog-to-digital convertor (ADC), which
is featured on the Photon board.
Luckily for us we do not have to understand how the ADC works in too much detail,
as the software we will write will take care of most of it for us.
