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BackModule (Bluetooth Smart) 21 Pin Module Digi XBee SMT RF ESP WROOM-02 espressif esp8266ex 2.4 GHz Wi-Fi and Bluetooth combo chip 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)) | | Screws, nuts, and spacers (see [build notes](build.md)) | | | | R16, R18, R26 | 3 | 100R | Resistor | | J11 | 1 | SW_Push | Push button switch, normally closed, generic, four pins D Momentary Switch, dual pole triple throw, 3 position switch, SP3T K switch single-pole double-throw spdt ON-ON D Screw terminal, single row, 01x03 D 2x5 pin shrouded header 2.54 mm spacing"/>