Hi, I'm playing with UNO R3 clone board. Everything worked perfectly but I can't upload new program now. I'm using Ethernet shield, DS3231 module and DHT11 in the current project.
I don't know why and how, but Arduino refuses to accept new program since yesterday. I have disconnected everything and did a loopback test - it works fine.
When I connect USB to the board, both green and orange (13) LED immediately shine. No blinking visible. If I press reset button, nothing happens. The orange LED does not turn off, it shine all the time.
Programming output ends with: avrdude: Send: 0   avrdude: Send: 0   avrdude: Send: 0   avrdude: ser_recv(): programmer is not responding avrdude: stk500_recv(): programmer is not responding
I do not have any other working board, no programmer. I have USBtoTTL converter and Pro MINI which I never used so far.
Any ideas? Thanks