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I want use the ATmega328P chip of the Arduino Uno board as a standalone device.

  • Is that possible?
  • Which pins are which on the Arduino board and the ATmega328P?
  • Do I need any external components?
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Yes it's possible. To use the ATmega328P to "emulate" an Arduino Uno board (without the USB part) you just need 3 ou 4 additional components: the oscillator, two capacitors and a resistor. Please take a look at: https://www.arduino.cc/en/Tutorial/BuiltInExamples/ArduinoToBreadboard for a schematic/breadboard. The Atmega328P features itself the memory, cpu and flash so those components are already inside the chip. You can find the relation of the pins in this image: Pin matching

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    you might also consider running it at 8Mhz w/o an xtal if you want simplicity, but a nano or pro micro would be easier.
    – dandavis
    Feb 15 at 18:58
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You can check the UNO's schematic. You can use this as a starting position. You can leave out the things you don't need. You might for example have no need for a voltage regulator on your board.

You may also have a look at the schematic of the Pro Mini, which are a lot more bare-bones.

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