According to the standard circuit of the graffiti activity, the following modifications have been made:
1. Referenced an Arduino Shield layout;
2. Change the power interface to Type-C;
3. Use Lichuang EDA to redo the PCB layout and try to be able to place orders for proofing online;
4. BOM should be associated with Lichuang Mall as much as possible. If the buttons and tube capacitance cannot match in the project, manual ordering is required.
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