... communicate with each other through digital pins ...
What size resistor do I use? Do I put a resistor on the output, and what size? Why, when I use resistors, do the other uCs (or the other Arduino) power up with no Vcc hooked up to them?
Also, the Arduino seems to have some weird logical rules,
I've got "If" statements that seem to run all the time, regardless of the condition being tested.
>My money is on the fact that you have ended the if statement with a colon. You lose. I'm using the example code in the "softserial" section on this site.
>In fact it is probably unwise to apply current to the digital pins if they are not powered in some way. I don't WANT the other arduino powered.
I don't WANT the other arduino powered. I've tried putting resistors on the digital pins, but it's still powering up, and now I'm getting "sync" errors ...
... but the Arduinos aren't getting any info, and the example routines don't work.
How do I keep the other Arduino from powering up through the digital pins?
is there some way I can isolate the pins so that I won't blow up any more Arduinos?
If all output lines were low, it couldn't power up through the pins, right?
Third, what do I have to do with the code to get it to work? I've read the SoftwareSerial routines on this site, and nothing has worked yet. Also, the Arduino seems to have some weird logical rules, I've got "If" statements that seem to run all the time, regardless of the condition being tested.