Part NumberDescription
ESP32-WROOM-32ERF Module, ESP32-D0WD-V3 SoC, without PSRAM, Wi-Fi 802.11b/g/n, Bluetooth, BLE, 32-bit, 2.7-3.6V, onboard antenna, SMD
MAX3232
AMS1117-3.3

RTU 420 schematic

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