OLIMEX© 2014 MOD-WIFI-ESP8266 reference
1. Remove the original connection between the pads. If it was made using
soldering – unsolder it and remove the soldering residue. If it was a
hardware PCB connection – make sure to cut between the pads with a sharp
tool (like a safety cutter).
2. Connect the pads of the desired position by soldering. Do not use a
large amount of soldering residue. Do not keep the soldering iron pressed
to the board longer than 10 seconds. Make sure that there is no left-over
soldering residue which might lead to accidental short-circuits.
If you want, you can add wires and a PTH jumper or a slide switch to the
pads of the jumpers. This would allow easier change of the jumpers in
future.
More details about the three different modes might be found in the
ESP8266 datasheet.
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