Different power sources, is Serial Communication possible?

[tolga121]

Hey falks

I have a question:

can two ICs communicate between each other if both do have their own Powersourece (like AMS1117-3.3) ?

See Shematic:

[TomGeorge]

Hi, @tolga121

In your project, yes they can, as long as they share the same gnd.

Tom..

[gilshultz]

If you cannot share ground you can go to an optical or CAN or ... form of communication. I would not recommend your design if the parts are on different boards or there more then 10" apart.

[tolga121]

@TomGeorge

In your project, yes they can, as long as they share the same gnd.

Thanks a lot Tom... and greetings from Bielefeld, Germany to Australia

@gilshultz

If you cannot share ground you can go to an optical

Thanks for your Reply. They share the same GND.

@gilshultz

I would not recommend your design if the parts are on different boards or there more then 10" apart.

Before you look at the following sheamtic, I've to say this:

the communication is accuring only for 10 seconds. They only share the wifi-credentials. And that's it. After sharing the credetials, there is no more communication between them.

[EDIT] forget to say: the ESP-Cam has not a board at all. All parts are placed on the ESP8266 board (PCB). The ESP-Cam ist only connected via JST to the ESP8266 board. I've just placed the ESP-Cam in a plastic case.

Look at the shematic here:

[jremington]

UART serial communications between boards works very well over distances of many meters. For distances up to several hundred meters, the serial Baud rate needs to be reduced, or use balanced, three wire RS485 transmission.