Not sure this is the right section of the Forum, but it seemed the best...
I've developed a project on the Arduino Uno, which uses the Digital Outputs to control some solenoid valves. It runs fine, but when I power it on, it triggers activity on some of the I/O lines, and fires the solenoids. It seems to be happening on pins 0 and 1. I can understand it doing this when I upload the code due to the serial transmission, but can you stop it happening when you just power on?
I did have the solenoids on Pin 13, but it was firing the internal LED on startup, and causing the same problem, which is why I moved the solenoids to pins 0 and 1. I'm not using any serial communication in sketch BTW.
Thanks in advance,