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2 Resistors and then anything with a 3.3v GPIO input pin (e.g. ESP8266) You need to build a voltage divider, the equations (or this calculator) on that page will help you work out what the ratio of the 2 resistor values need to be (But something like 20 kohm and 7.5 kohm should be in the right ball park). When the pin goes high, you can then make a HTTP ...

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