12v / 6amps to arduino barrel jack

Other Hardware General Electronics
21

6v6gt:
To help make the points a bit more concrete, I've tried to draw a schematic based on my interpretation of what you have said.

If the fan has only a small power requirement (mA), this may work. Does it look like what you want to achieve ?

Click to enlarge, depending on your browser:

uno1.JPG
uno1.JPG1183×1016 47.5 KB

Thank you so much for the effort. I really appreciate it. The schematic that's almost what want. Except for the vin part. I'm gonna need to borrow your schematic and edit something. Your schematic given me an idea on how the vin pin works :slight_smile:

22

The Uno Schematic is here: https://www.arduino.cc/en/uploads/Main/Arduino_Uno_Rev3-schematic.pdf

Just in case it makes a difference to you, my rough sketch wrongly shows the input to the 5v regulator direct from the barrel jack (marked X1 in the official schematic - top right section ). The 5v regulator is (also) fed from the Vin pin.

23

KyleFrancis:
Meaning 12V 6a is to much if there is not much load on the board. Though it may work but it will generate more heat? Since there's so much of an excess current? Am I getting it right? Thank you so much for taking time to :slight_smile:

No.jpg

There is no "excess current". It doesn't matter if the PSU is rated at 6 Amps or 600 Amps,

THE ARDUINO WILL DRAW ONLY THE CURRENT IT NEEDS!!!!

As long as your power supply can deliver the current needed, then you are OK. That is why I keep asking what is the total current requirement of your devices.

You are conflating current with voltage.

No.jpg

24

SteveMann:
No.jpg

There is no "excess current". It doesn't matter if the PSU is rated at 6 Amps or 600 Amps,

THE ARDUINO WILL DRAW ONLY THE CURRENT IT NEEDS!!!!

As long as your power supply can deliver the current needed, then you are OK. That is why I keep asking what is the total current requirement of your devices.

You are conflating current with voltage.

Thanks so much Sir. "THE ARDUINO WILL DRAW ONLY THE CURRENT IT NEEDS!!!!" that's very clear.

Thank so much everyone for giving sometime. Got the Arduino running :slight_smile:

25

It is often pointed out that my power points for example, are rated 240 V, 10 A which is 2.4 kW. But when I plug in my 3 W Aldi lamp, it does not turn into a room heater because the power point has that rating. :astonished: It actually draws - about - 15 mA (RMS AC, allowing for losses).

And you should not use the "Barrel jack" or "Vin" if you propose to connect anything other than two or three indicator LEDs drawing 15 mA apiece, to the Arduino.