Adventures in deep sleep with ESP8266 and a temperature sensor – Tomas McGuinness
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Tzt Starter Kit For Arduino Uno R3 - Bundle Of 5 Items: Uno R3, Breadboard, Jumper Wires, Usb Cable And 9v Battery Connector - Integrated Circuits - AliExpress
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3 Pcs Two Wire Lead On/Off Switch 1 x 9V Battery Cell Case Holder with ESP8266 01 WIFI TransceiveR Board Module|Wireless Module| - AliExpress