Locations to solder for the battery remaining display!

[Sarah-C]

STOP! ATS 20+ users!

The below isn't needed! G8PTN has pointed out that it HAS the needed resistors already on the A1 pin of the device... Please follow his advice, and leave your soldering iron alone!

If we solder to the negative and positive of the battery, there's always some current used even when the device is off. So I looked on the board for a suitable spot to use that's part of the circuit within the on/off switch control.

I found the 5V pad shown in the screenshots was straight from the battery through the power switch. So I heat shrank (to avoid any shorts from the resistor bare wire legs) two 10Kh resistors and soldered one to this pad, and one to the ground pin of the Arduino Nano - simply because it's easy to solder to.

Erm.... a mistake! I cut the resistor leg a bit short for the 5v pin resistor, so the yellow wire you see from A2 curving around is to correct the short resistor leg! It's just soldered at the point between the two resistors that are joined.

To be fair though, it works out a bit better as soldering a single solid wire to A2 is easier than two resistor legs twisted together. It leaves room on either side.

I hope someone finds the pictures useful, and perhaps Vincent will put them in some instructions somewhere?

96% battery left! YAY! It works.
Additionally the voltage divider is turned off by the power switch so there's no power draw when it's off.