Beehive Instrumentation Project-2: Raspberry Pi 2 on 18V Drill battery power


RPi 2 with 18V drill battery power.

RPi 2 with 18V drill battery power.

Last post, I checked out the UBEC as a DC-DC converter to power the Raspberry Pi 2-B from a Ryobi 18 V tool battery.  This time, I actually plugged the RPi into the battery power.  I attached the 5V output leads to a USB socket so the RPi could be powered through the micro USB connector for additional protection.

So far, I have operated the RPi2 from the battery for over 8 hours, including working on the Apache server (see later) over SSH, and an HDMI connection to a TV part of the time.  Battery open-circuit voltage dropped from ~22V to 17.35V.  Looks promising so far.  I’m planning a battery monitor using one of the channels of the MCP3008 analog-digital converter for a more accurate measurement of power status.

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