If the Raspberry Pi is connected via USB directly to the socket than you can use the power supply via the USB connection to the Raspberry Pi to power both the Pi and the Arduino. ![]() In case of you used Arduino Uno we use the DC barrel power jack. ![]() ![]() Good to know that there are two other possibilities to save the power supply as you can read in the different article about the micro-controller: Arduino Mega, Arduino Uno, Arduino Nano. Also this was my first idea and I tried this possibility, but the power supply of the Raspberry Pi broke down and the Pi shut down. In this case you have to find another power supply for the Arduino because the PC or Laptop is not able to supply both the Raspberry Pi (~ 700mA/5volt) and the Arduino (~ 40-50mA/5volt). The Raspberry Pi is connected via USB to a PC or Laptop.In general we have to differ between two use cases. But in case of the Arduino the USB cable connection is blocked by the connection to the Raspberry Pi. We can power the Raspberry Pi as usual about the micro USB port on the side of the unit. ![]() The power supply for the Pi is not restricted by the serial communication. Now let us talk about the power supply for the Raspberry Pi and the Arduino. As mentioned before we use an USB cable for the Arduino to Raspberry Pi communication.
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