I have a system that consists of three modules (one an Arduino), all running from 5VDC. Normally, they will be running from one power source, as shown in (A) of the diagram attached.
However, there are times when the Arduino will be powered by another supply, as in diagram (B). In this case, a connection between grounds on the Arduino and one of the modules is made, so that communications between the modules can occur or the signals from other modules can be read on the Arduino.
I want to leave this connection in place (for convenience), as can be seen in diagram (A). I need your expert advice on this scheme. Is it going to cause ground loop problems? Are there other issues I am not seeing?
Thanking you for your brilliance in advance.
However, there are times when the Arduino will be powered by another supply, as in diagram (B). In this case, a connection between grounds on the Arduino and one of the modules is made, so that communications between the modules can occur or the signals from other modules can be read on the Arduino.
I want to leave this connection in place (for convenience), as can be seen in diagram (A). I need your expert advice on this scheme. Is it going to cause ground loop problems? Are there other issues I am not seeing?
Thanking you for your brilliance in advance.