I've been running my arduino uno without problem since I received it last week - uploading sketches, etc. Tonight, I was experimenting with sending signals (using a blink sketch) from arduino output pins to a parallax i/o board relay input. I may have crossed wires or something because now when I attempt to upload a sketch I get the following message: avrdude: stk500_recv(): programmer is not responding The green ON light stays on but so does the pin-13 LED.
Should I try replacing the MEGA328P , the whole uno unit or is there a software approach to consider? By all indications, my linux is detecting the uno on /dev/tty/ACM0 but I just can't upload a sketch.
Thanks for any suggestions. lux11