Pin 0 and 1 acting weird

Development Tools IDE 1.x
1

Hi everybody, I just received my Arduino and I must say that it's fun to play!

The thing is, I was doing stuff with when some pins start being weirds when connected to the GPIO extension board, (I got a message like that : avrdude: ser_open(): can't open device ".\COM3": Access is denied. and I tested anything possible about the COM3) when I disconnected the breadboard and the gpio extension it starts uploading successfully. But now, both digital pin 0 and 1 are always on (The 0 is less bright than the one) and the other pins are all dimmed as hell.

Anyone ever saw this?

Thank you!

2

as a rule its best not to use those pins and dont have them plugged into things when uploading a scetch

3

Those pins are used for serial communication, and putting stuff on them will break serial communication, including uploading of the sketch.

That said, I'm unsure why you were getting an access denied error, rather than an out of sync error.

4

Yestarday, the access denied problem only happened when I was connected using the GPIO extender to a breadboard. If I only use the GPIO without the breadboard it seems to work fine.

That said, I'va tried with my mac after (I was usign my windows desktop both on the IDE and using the arduino sudio plugin) to test and it worked, I'll test some stuff again tonight. I was tryingto play with a seven segment led display, the display was acting weird while the code was running but I was using pin 0 and 1. I'll try again using other pin and see how it's going on.

Thank you for your replies guys! I appriciate it!

5

pin 0 1 and 13 are ones that can cause issues if you use them for some things

6

There's a bug in 1.6.8 that constantly polls the serial ports, causing them to reset and do weird things (including that "access denied" issue). Take a look at the topic "IDE 1.6.8" and "Arduino 1.6.8 constantly polling serial, resetting Arduino board". It might be best to downgrade to 1.6.7 until it's fixed.