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6.
Alternative Energy Settings
Battery Operation
So far, we have been running the nodes from USB power (the SNAPstick) and from wall
power (the SN171 Proto Board).
It is also possible to run the SN171 Proto Board from battery power using the battery
holder included in the EK2100 kit.
Before you can power this board from the external battery pack, you must unplug the
external power supply and change a jumper located near the center of the circuit board.
The jumper posts for this jumper are labeled “VBAT”, “VCC”, and “VEXT”.
The board comes from the factory with the jumper connected to the VEXT and VCC
pins, which configures the node to run from the external power supply.
If you move the jumper so that it connects the VBAT and VCC pins, then the board will
be configured to receive power from the white two-pin connector located directly behind
the barrel-jack that the external power supply plugged into.
After changing the jumper to the VBAT+VCC position, install two AA batteries in the
external battery holder, and connect the white connector from the external battery pack to
the mating white connector on the Proto Board.
NOTE! There is an on/off switch on the external battery pack. Be sure to slide
it to the “On” position when you want to power up the SN171 Proto Board.
EK2100 Users Guide-v1.5
Page 49
of 53
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