Arduino GND pins

Projects General Guidance
1

HELLO,
im using MEGA 2560. it has 5 GND pins. are they analog GND or digital GND?

Thank you,

2

There's no distinction. The Arduino boards don't keep a separate analog ground.

3

GND is just GND

all 5 are the same

4

But i know that there is analog grounds and digital grounds.

5

Yes, but on the Arduino board all grounds are connected together. Use your multimeter and confirm yourself.
You can connect analog grounds to a ground header near the analog pins if that makes you feel better.

6

So i can connect analog grounds and digital grounds togheter to the GND pins in the arduino?
I have 25 pins connector from a mechine, and its has four pins of grounds: POWER ground, Signal ground, Chassis ground and digital ground. i need to connect all this grounds somehow, i can connect all of them to the arduino directly althought they are diffrent grounds?

Thank you,

7

Power, signal and digital grounds should all come together at the Arduino. Avoid connecting them elsewhere, if possible.

Chassis ground depends on if this thing is powered from a 3 pin power cord. It should be earthed to the earth pin. If it is a battery operated thing then connect it to power ground at one point in the system, which can be the Arduino.

8

The mechine is 3 pin cord and not battery operated. i have some questions:

  1. what do you mean about earth pin?
  2. the GND of the arduino are digital?
  3. i need to convert the pwm to analog voltage and send it to one of the 25 pins of the mechine, so its returns to the arduino throw the chassis ground?

Thank you,

9
  1. The earth pin on your power cable. The green or green-stripe wire.
  2. Yes.
  3. No. Earth is not suitable for this.
10

So i need to connect the Chassis ground to the earth pin?

Thank you,

11

In general, yes. For your specific device that you keep secret from us, I don't know. I don't even want to know.

12

MKS 247D P6 Connector

13

what are these ground types:

  1. signal ground
  2. power ground
  3. chassis ground

(im using MKS 247D machine)

Thank you,