So you can connect battery positive to Vin pin and negative to Ground pin directly. For controlling the servo, check out Adafruits servo tutorial. Its important to note that you need to connect the ground of the the power supply to the ground of the Arduino. The power supply is indicative of your 5V 2A 'wall wart'. Leads from a battery can be inserted in the Gnd and Vin pin headers of the POWER connector. To power your servo externally, wire the servo and Redboard according to the schematic below. The adapter can be connected by plugging a 2.1mm center-positive plug into the board’s power jack. (it is one of the red pins in the image below). External (non-USB) power can come either from an AC-to-DC adapter (wall-wart) or battery. Instead of connecting the voltage to the DC jack, instead feed your 5V into the +5V pin on the Arduino header. I have read many forum posts that discuss how to power an Arduino with an External 5V power supply. Yes, you can run the Arduino Mega off of a 5V supply. The power source is automatically selected to the highest voltage source. Hi All, I just wanted to confirm something with you. The Arduino Nano can be powered via the Mini-B USB connection, 6-20V unregulated external power supply (pin 30), or 5V regulated external power supply (pin 27). There is a built-in regulator that will supply the Arduino with exactly 5V. This should be above 6.2V (since the dropout voltage is 1.2V) and preferably between 9V and 12V. The board can operate on an external supply of 6 to 20 volts. Connect an unregulated power source, eg a battery, to GND and VIN. Leads from a battery or DC power supply can be connected to the Gnd and Vin pins. Use a regulated power source, trusted to be 5V, and connect it to GND and 5V.
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