ESP8266 Thing Developpment Board w/ Headers Introduction

1/23/2018 ESP8266 Thing Development Board Hookup Guide - learn.sparkfun.com
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The SLEEP_EN jumper set: enables using and waking up from deep sleep mode, but disables programming.
To use the jumper solder a 2-pin male header and slide a 2-pin jumper on and off. This is a through-hole jumper only,
because you’ll need to remove the jumper to program the ESP2866.
The PWR-LED jumper allows you to disable the power LED. The LED will normally pull about 7mA, which is a ton compared to the
ESP8266’s 10’s of µA consumption in sleep mode.
To disable the power LED, slice the interconnecting trace with your handy hobby knife.
Selecting the Antenna
The Thing Dev Board’s default WiFi antenna is a PCB trace antenna based on this TI app note. It’s cost-effective and actually works
really well!
If you need to connect a more sensitive antenna, or need to route outside an enclosure, a U.FL connector is also available on the
board, but isn’t connected by default to the ESP8266’s antenna pin. To connect this antenna to the chip, you’ll need to swap the
jumper by removing the solder blob and pushing it over to the other side.