I was diddling around with an AT09, trying to talk to it. Eventually, it became obvious.
In any event, I was using the SoftwareSerial library to talk to the AT09, and regular serial (through usb) to talk to the serial monitor. (gee, these aren't the same AT codes I was using in 1982!). I could happily talk to it. I used "Serial.begin(9600);", which seems to be the source of my problems.
The sketch still runs and responds, but it won't take a new one. (It has been disconnected for a matter of days, and I've unplugged several times). The green light stays on, the red flashes, and I get
User configuration file is "/Users/hawk/.avrduderc" User configuration file does not exist or is not a regular file, skipping Using Port : /dev/cu.wchusbserial1420 Using Programmer : arduino Overriding Baud Rate : 115200 avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00 avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x00 avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x00 avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x00 avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x00 avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x00 avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x00 avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x00 avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x00 avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x00 avrdude done. Thank you.
I've tried hitting reset as compile finishes, holding it down as I apply power trying to hit at various times at the end of the compile, and whatever I do, the old sketch runs.
It even sends my test messages (such as ***splat***!) back to the serial monitor.
I'm using the same computer with the same cable as when I could change it before, and I've installed the arduinio side on another computer, with the same results.
I've put the drivers for the 34x chinese chips on both, and it clearly talks to and sees the chip.
The board is a nano clone with mini usb on board.
I'm not being a path out other than starting with another board . . .
any suggestions would be appreciated.
thanks
hawk