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BackWi-Fi Bluetooth external antenna espressif 15.4*15.4mm ESP32-S2-WROVER(-I) 2.4 GHz Wi-Fi https://www.espressif.com/sites/default/files/documentation/esp32-s2-wroom_esp32-s2-wroom-i_datasheet_en.pdf 2.4 GHz Bluetooth ble zigbee 802.15.4 flash crypto ATSAMR21G18 AT45DB041E TECC508A U.Fi Class 4 Bluetooth Module with on-board components PCB initial layout, no traces Fireball/Fireball.kicad_prl | 8 | 1N4148 | 100V 0.15A standard switching diode, DO-35 | | R8, R10, R12 | 3 | 10uF | Polarized capacitor | | | R14, R15, R18 | 3 | A1M | Potentiometer | | D1, D2, D3, D4, D5, D8, D9, D10 Standard switching diode, DO-35 | | | | Tayda | A-1605 | | R5 | 2 pin Molex connector | | R5, R29 | 3 | 2N3904 | Small Signal NPN Transistor, TO-92"/>