Hey guys, first of all sorry about my english, i'm brazilian... So,
I have a little doubt about the USB connection...
In my project, i want that arduino does something when it is only connected in USB, and when the arduino is connected to the 127V, i want it to do other thing...
How can i code this little part? I tried "if (Serial.available() > 0)" but that didn't worked. The code always "ran", even if the arduino is connected to the 127V and without the USB connection...
Thanks
See: http://forum.arduino.cc/index.php/topic,120693.0.html
Another method would be to connect Vin to an analog pin (eg. A0) via a voltage divider, to guard against too high a voltage on the analog input. Then take a reading to see if the voltage is above or below 5V. In my case with USB power I measure 4.5V on Vin, and over 8V when connected via the power plug.
Don't connect Vin directly to A0 because the voltage will be too high - use a voltage divider.
I tried "if (Serial.available() > 0)" but that didn't worked.
All that tells you if serial data is available, not if the USB is plugged in or not.
Looks like I answered this before. Code and schematic here:
http://forum.arduino.cc/index.php?topic=107860.msg809962#msg809962
Thank you so much... I did a search before post this thread but i didn't find anything
Thats all that i was looking for...