I am a brand new user, very novice. I am attempting to use the temperature sensor with a 9V battery and EEPROM on an Arduino Uno to record temperature for a few hours outside.
This morning I was able to upload a sketch using Chromeduino2, I know it worked because I have an LED lit on my breadboard. I wanted to test using a battery so I then hooked up a 9V battery and unplugged my usb connection and the arduino is still working (LED is still lit). I unplugged the battery and it powered down.
Now I went to upload my datalogging code using the USB connection and I get "Could Not Set Baudrate". I switched to a few simpler codes I found online, like Serial.begin(9600), Serial.print("hello"), etc. and I am getting the same error.
The board is not dead, the old code is still running and when it is powered either by USB or battery the LED will light up.
I did try modifiying the baudrate in Setup as well as in my code (9600, 115200, etc.) and I always get the same error message.
I'm not finding much at all on this error when I google around online.
Any help greatly appreciated, thank you in advance.