i am building a sumo bot. for this i am using an arduino uno rev3 board, grove sensor shield, two 12v 1.5A motors and i want to use an arduino motor shield. from all the documentation that i read if using a 12V battery it is recommended to cut the "Vin Connect" jumper because 12V is too much for the arduino board.
in this scenario what is the best way to power the board?
the two options i can think of are: 1: run the 12V power directly to the motor shield. install a 9V regulator parallel to the battery and using a 2.1mm center-positive plug connect it to the board. (is this too complicated of a solution?)
2: run the 12V power directly to the motor shield. install a 5V regulator parallel to the battery and send the 5V and Ground to one of the unused connectors of the sensor shield. (would back feeding the board this way fry anything? or would it cause problems with programming it if the external power is still hooked up?)