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Chip antenna (http://ww1.microchip.com/downloads/en/DeviceDoc/60001380C.pdf Cypress EZ-BLE PRoC Module (Bluetooth Smart) 21 Pin Module Digi XBee SMT RF ESP WROOM-02 espressif esp8266ex 2.4 GHz Wi-Fi Bluetooth external antenna espressif 20*15.4mm 2.4 GHz Wi-Fi and Bluetooth combo chip https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32_datasheet_en.pdf Single 2.4 GHz Wi-Fi and Bluetooth module Single 2.4 GHz Wi-Fi and Bluetooth combo chip https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32_datasheet_en.pdf Single 2.4 GHz Bluetooth ble zigbee 802.15.4 flash crypto ATSAMR21G18 AT45DB041E TECC508A U.Fi Class 4 Bluetooth Module without antenna Low-Power Long Range Transceiver Module LoRa Radio, RF, Module, http://www.hoperf.com/upload/rf/RFM69HW-V1.3.pdf 8 pin DIP socket A-004 4 Knobs Screws, nuts, and spacers (see [build notes](build.md)) | | | | | R9 | 1 | 2_pin_Molex_header | KK254 Molex connector 2.54 mm spacing | Tayda | A-1672 | | | C1, C11, C12 | 3 | 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 | | | | | | | Tayda | A-1847 | | J8 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TO-99-8 | | J7, J8, J9 | 1 | SW_Push | Push button switch, generic, two pins K switch single-pole double-throw spdt ON-ON D Double Pole Single Throw (SPST) switch with signal lamp, generic K switch normally-open pushbutton push-button LCD illuminated right angle right angle http://www.alps.com/prod/info/E/HTML/Tact/SnapIn/SKHH/SKHHLUA010.html tactile switch D.