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19pad numeric keypad

 
Overview
A numeric keypad was made using an APM32F103CBT6 microcontroller. The outer shell and gasket structure
positioning plate were 3D printed. Cotton strips/silicone pellets were used.
The crystal oscillator in the BOM was replaced with an 8MHz
oscillator with an SH1.0 interface. The wiring sequence can be found in the schematic/PCB diagram.
参考设计图片
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