Main components

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Part NumberDescription
ATtiny202-SS20MHz, 2kB Flash, 128B SRAM, 64B EEPROM, SOIC-8
TS5A23159DGSDual SPDT 1ohm Bidirectional Analog Switch with Off protection, VSSOP-10
CH340EUSB serial converter, UART, MSOP-10

2x1 schematic

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2x1 board layout