How to use external power supply for Arduino?

How to use external power supply for Arduino? How to provide external power to sensor, relay, servo motor ...

Answer

When should use the extra power supply

Power from 5v pin of Arduino may NOT be enough in some cases. For example:

  • The sensors/devices consumes much energy
  • A large number of sensors/devices are connected to Arduino

How to connect to the external power supply

In these cases, we MUST use the external powers for sensors/devices. To use multiple power source, it need to follow the following conditions:

  • MUST NOT connect 5V of the external power supply to 5V of Arduino
  • MUST connect GND of the external power supply to GND of Arduino

Example

  • The external power supply for servo motor
  • Arduino external power supply for servo motor

    Image is developed using Fritzing. Click to enlarge image

  • The external power supply for relay
  • Arduino external power supply for relay

    Image is developed using Fritzing. Click to enlarge image

  • The external power supply for LED strip
  • Arduino external power supply for LED strip

    Image is developed using Fritzing. Click to enlarge image

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