I’ve been getting this error message when I try to upload to my board ever since I upgraded to OSX el Capitan
works fine on my other computer. It randomly works very occasionally on the laptop that gives me this error. Tried re-installing drivers many times, no luck. Anyone have any ideas ?
Do you have an original arduino? which model?
Remove anything from the USART (serial) TX and RX pins. Also, make sure you’re working from a common ground if you have things attached to other pins.
it was the serial Pins. I had things connected to D0 and D1 which is doesn’t seem to like (i think those pins are used for serial comunication by default?)
thanks guys!
They are. You can sometimes use the software serial library to do serial communication instead using different pins, but it’s not as fast or reliable.
Yeah they’re connected to Tx/Rx on the USB USART line. Only an issue when the chip is active, though, so if you need the extra pins you only need to disconnect them when programming/serial monitoring 