On the Arduino Mega 2560, The top left of the Board has power supply for 3.3V and 5 V. Can the Arduino Board supply higher voltage- 12V to a sensor?
Thank you for the quick response!
What/how does the Vin pin on the Arduino work?
would it be alright to supply voltage by Vin and also connect through USB ( printer )cable at the same time
Doesn't change the amount of power available to each pin, what do you expect by using two power supplies?
If voltage is supplied by Vin, it takes precedence over voltage from USB.
schematic: https://content.arduino.cc/assets/MEGA2560_Rev3e_sch.pdf
A link to savor:
https://support.arduino.cc/hc/en-us/articles/360018922259-What-power-supply-can-I-use-with-my-Arduino-board
You never want or need to connect two power sources to your arduino. It does have voltage protection built in but you can fry it. I have used arduinos for many years it is best to get external power for all things connected to the arduino. If you want to do a quick test it is fine to use the 3.3v or 5V pins, but I would never rely on them long term.