https://learn.sparkfun.com/tutorials/esp8266-thing-development-board-hookup-guide/all 5/24
You can supply anywhere between 3.3V and 6V into these inputs to power the board.
Note: Unlike the original ESP8266 Thing, the ESP8266 Thing Development Board does not have a built-in LiPo charger. A
LiPo battery can be connected into a populated JST connector, but you'll need to add some extra circuitry to charge it.
Power-Saving Jumpers
A pair of jumpers on the back of the board can be used to help reduce the Thing’s power consumption.
Jumper
Label
Default
Setting
Notes
SLEEP-EN Open Connects GPIO16 (XPD) to the ESP8266's
RST pin.
PWR-LED Closed Completes the power LED indicator circuit.
The SLEEP-EN jumper connects GPIO16 (which has the XPD functionality) to the ESP8266’s reset input. This connection is
required if you want the ESP8266 to automatically wake itself from deep sleep.
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