I’m new to the forum, and I am seeking help on an issue I found with Arduinos.
I have designed several standalone programs with no use of Serial link and these are all working fine without computer connected. Recently I have written a program that uses Serial for communication between 2 arduino UNO ( via RS 485 but it’s not the point ).
I have noted is that when Arduinos are connected to a computer with USB ( and also to each others via RX/TX cross-wired ) it does work ( RX and TX leds are flashing accordingly ), but when no computers are connected ( and whatever power supply I’m using, +9 on the appropriate, +5 on Vin or USB plug ) nothing happens anylonger, and the RX/TX leds are not flashing anymore.
Has anyone already faced this situation ?
Looks like a kernel bug to me ?