Atemga 8/168/328 processors are optional. Atmega 168P is currently installed. I feel that 16K memory is enough. If you want to burn music or the like, you can use 328P with larger memory. Reserve the soldering pad and connect the soldering wire to USBtiny ISP for burning (add minicore to support 168p processor). I am a sophomore in high school and have only been drawing for more than a year. After proofing, welding, fabrication, and debugging of this project, no problems were found that were inconsistent with expectations. If there are any deficiencies, please point them out.
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