There are 3 10K pots on the board I designed. When the 110VAC power is lost, there is uninterrupted 12VDC that is supplied by the 12 battery (thanks to the 2 capacitors).
overkill, I know, but recycled them from my RV) and a 12VDC output from a 110VAC>12VDC power supply. Here is a picture of my battery-backup board that has 2 supply sources, a 12VDC battery circuit (2 6VDC 260Ahr in series. You could use 2 resistors (voltage divider) instead of the pot, but I find it easier using the pot adjusting screw to get to the desired voltage and I ordered a bunch of them to use on other projects. After you complete the configuration you can connect the pot's center tap to the Analog pin you selected. Now you will need to configure one of the Zigbee's ANALOG pins (AD0/AD3) as Analog. Use 14.3 as your batteries max voltage when doing the program calculation. I left a little buffer zone by not adjusting to the maximum 1.2VDC. The charging voltage was 14.3VDC and I then adjusted the pot center pin output to 1.1 VDC. I let my battery discharge overnight and I then connected the battery charger to battery the next morning. The center pin, PRIOR to connecting to any of the ZigBee Analog pins, must be calibrated to read a max of 1.2VDC.
One side of the pot I wired to the negative battery terminal and the other side of the pot to the 12VDC battery terminal. The Zigbee analog pins will accept a max of 1.2VDC on the analog pins, so I used a 10K Ohm Precision Cermet Potentiometer Trim-pot Trimmer Pot - 10K Ohm which can be ordered on Amazon. I am monitoring a RV's 12VDC battery system.
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