Good day.
I am using three Arduino Nano's in my application. Rather that run three ground wires and three 5v wires to my control panel, I would like to use a common ground and a common 5v output wire. There is no communication between the three Nano's. They will however, be powered by a common power supply connected to the VIN pins, though I don't believe this would have any bearing on the use of common ground and common 5v output.
So my question: Is there any problem sharing a common Gnd wire and common 5v output wire?
Thank you.
Regards,
Jim
IF you ONLY have three Arduino boards, there is no problem. If you have other devices with varying current requirements, then you are inviting problems.
The 5v wire connects to switches and potentiometers which, in turn, connect to the Nano's pins to read the signals. Other Nano pins output a 5v "HIGH" to a Stepper Driver.
Is your concern that there would be a lack of amperage, or that one Nano's amp draw would impact another?
Thanks for your reply
Common ground, encouraged. 5V regulator outputs, do not cross-connect. Regulators are not designed to compete, nor co-operatively share loads. You may get away with it, or you may junk one or more Arduinos in short order. Feeling lucky?
Furthermore, more information about your loads is needed, but:
- the 5v output should not be used to power any form of motor. Logic 5V outputs to a motor driver, yes, but provide the motor driver with it's own supply.
buttons, switches and pots feeding Arduino inputs, all your Arduinos should be capable of powering their own share of such devices.
However, don't run 5V from Arduino A to any digital inputs of Arduino B. Because, when Arduino B is powered down for whatever reason, the input protection circuitry (essentially, diodes) internal to the input of the Arduino become forward biased, forming a direct path to ground for the available current of the regulator on Arduino A; damage to Arduino B will ensue.
camsysca
Thank you. I was aware of most of that, but hadn't really considered how the voltage regulators would handle it.
Will run separate 5v lines.
Thanks.
I believe that I have discovered the answer to my own question concerning sharing Ground between multiple Arduino's, and the answer is "NO". I discovered that with a shared Ground and with potentiometers connected to each Arduino, the wipers are also connected. So I will NOT be sharing either the ground or the 5v output.
Thanks
Jim
If you don't share the grounds, exactly how are you connecting this common power supply to three Nanos?
This makes absolutely no sense. A schematic at this point is required, as words are always inexact.
Do you have the wipers connected to ground, rather to an Arduino pin?
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