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Topic: Understanding ground  (Read 352 times) previous topic - next topic

Chibiliplop

Hello everyone,

I hope i'm at the right place to ask my question.

I find this project https://easyeda.com/editor#id=|0ce7b95d2bc54593a783487a44f185ce to perform a RC transmitter, but one thing bothers me how can the project work since no ground is wired to each other?

Did i miss something about ground?


(More information about project can be found here https://howtomechatronics.com/projects/diy-arduino-rc-transmitter/)

MorganS

It's a radio transmitter. That doesn't need ground.
"The problem is in the code you didn't post."

Chibiliplop

#2
Nov 05, 2019, 11:45 am Last Edit: Nov 05, 2019, 11:45 am by Chibiliplop
When I speak about ground I speak about the negative part of the battery not the ground as earth.

Maybe it wasn't clear?

Hutkikz

#3
Nov 05, 2019, 12:43 pm Last Edit: Nov 05, 2019, 12:44 pm by Hutkikz
It is connected. It's called a ground plane. Notice that unlike the power/signal traces the ground connection is not separated by black outline around it. that's because the entire area of the board(on that layer) that isn't a power/signal trace is ground.
Hope that helps  :)

Chibiliplop

Thanks a lot Hutkikz.

I now realize how dumb was my question.
That's the first time I see this kind of PCB. Coming from hand made PCB and breadboard prototype it wasn't obvious for me.

Again, thanks !

gilshultz

#5
Nov 08, 2019, 03:16 am Last Edit: Nov 08, 2019, 03:19 am by gilshultz
Ground is the reference point for measurements.  Voltages can be +, -, or both, it depends on the design.  If you want to have a lot of fun look at some complex analog designs.  If you have more then one ground circuit you have more then one reference point (Hmmmmm!!!) you then have to define your reference point.  The electronic devices need a reference point to communicate with each other regardless if it is digital or analog, It is very common to have several different ground reference points and wonder why it goes batty, that is why you consistently see connect the grounds. If in doubt measure the voltage difference between grounds, if you have one you found your problem. You can also power down and check using an ohm meter.

Even RF needs the ground although it can be derived as a ground plane because of the frequency involved. That is why radio, Tv and many other things work including your cell phone. When you measure RF you use different instrumentation then when measuring analog and digital signals. For a much better explanation try this link: https://www.electronics-notes.com/articles/antennas-propagation/grounding-earthing/antenna-rf-ground.php,
There is no such thing as a dumb question.  

How can you can you ask like an expert without the knowledge and experience. Keep asking the questions, you will eventually learn. Surprise not all experts are actually experts.
Good Luck & Have Fun!
Gil
This response is to help you get started in solving your problem, not solve it for you.
Good Luck & Have Fun!
Gil

lastchancename

There's a specific thread on ground and 0V in the Introductory Tutorial section.
Experienced responders have a nose for laziness, (they were beginners once)... Sure, there are trolls, chest-beaters, and pretenders - but the help you'll get here is about as good as it gets - if you try to help youself!.

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