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Unable to write in the comments. If you are looking at using just a raw atmega328p, you can use the Arduino as ISP sketch and then upload your existing sketch to the new chip. I use it for programming ATTiny 85 chips for small stand alone projects. The P means that you already have the bootloader on the new chip, so you don't need to use the burn bootloader. Here is a LinkLink to the Arduino site which explains this in detail.

Unable to write in the comments. If you are looking at using just a raw atmega328p, you can use the Arduino as ISP sketch and then upload your existing sketch to the new chip. I use it for programming ATTiny 85 chips for small stand alone projects. The P means that you already have the bootloader on the new chip, so you don't need to use the burn bootloader. Here is a Link to the Arduino site which explains this in detail.

Unable to write in the comments. If you are looking at using just a raw atmega328p, you can use the Arduino as ISP sketch and then upload your existing sketch to the new chip. I use it for programming ATTiny 85 chips for small stand alone projects. Here is a Link to the Arduino site which explains this in detail.

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Unable to write in the comments. If you are looking at using just a raw atmega328p, you can use the Arduino as ISP sketch and then upload your existing sketch to the new chip. I use it for programming ATTiny 85 chips for small stand alone projects. The P means that you already have the bootloader on the new chip, so you don't need to use the burn bootloader. Here is a Link to the Arduino site which explains this in detail.