Go Down

Topic: BEGINNERS: Why is GROUND so important? (Read 1 time) previous topic - next topic

lastchancename

There is no secret to 0V / GROUND.

Your power supplies (except in quite unusual situations beyond Arduino) should all have their 0V / GND wires tied together - no other topology makes sense.

This basic understanding of voltages (potential difference) is critical to wiring up *any* electrical circuit.

GROUND is a potential that is  nominally equal to the surrounding electrical 'environment'.
POSITIVE voltages are those 'above' ground.  +12V, +5V and +3V3 are the common positive voltages.
NEGATIVE potentials are those voltages *below* ground potential.

In virtually every 'standard' Arduino project, there are no negative voltages exposed to the developer/user.
Custom boards and interfaces may add 'other' voltages needed by the application.

So the take-away is : BEFORE you burn out boards, or start programming, make sure you have your hardware worked out.
There's no point putting fuel in your car if it doesn't have tyres!
Experienced responders have a nose for laziness, (they were beginners once)... expecting the poster to contribute to the learning experience.

Grumpy_Mike


LMI1

Weirdest things I have seen happen when someone forgets to connect grounds together.

SnacksDaily

What do you mean by "connecting grounds together"?

Grumpy_Mike

What do you mean by "connecting grounds together"?
You take the ground off one system and wire to to the ground off another system.

Clearly you have not read the link I posted.

lastchancename

#5
May 04, 2018, 10:54 pm Last Edit: May 10, 2018, 05:25 am by lastchancename
The two separate systems - the grounds should be connected together with the lowest resistance path available.

Experienced responders have a nose for laziness, (they were beginners once)... expecting the poster to contribute to the learning experience.

Go Up