Main components

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Part NumberDescription
ATmega328-P20MHz, 32kB Flash, 2kB SRAM, 1kB EEPROM, DIP-28
DHT113.3V to 5.5V, temperature and humidity module, DHT11
AMS1117-5.0

Kicad schematic

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Kicad board layout

Kicad PCB render

Top PCB
Bottom PCB