In all the projects and explanations I will use various terms to identify the same thing.
In particular I could mention
0V, negative pole of the battery, ground,
Those all mean the negative pole of the battery that is at 0V.
On the other side of the spectrum I mention
Vdd or positive pole.
This refers to the positive pole of the battery which exact value will be different depending on the battery or power source used:
5V, and so on.
Why so many terms? Different families of electronic components adopted different acronyms:
- TTL (Transistor-Transistor Logic) components use
- CMOS (Complementary Metal-Oxide-Semiconductor) components use