Main components

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Part NumberDescription
CH340CUSB serial converter, crystal-less, UART, SOIC-16
ESP32-WROOM-32DRF Module, ESP32-D0WD SoC, Wi-Fi 802.11b/g/n, Bluetooth, BLE, 32-bit, 2.7-3.6V, onboard antenna, SMD
E28-2G4M27S

e28 tx schematic

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e28 tx board layout