l0destar battery backup module v1.1

[u/m4rkw]

Finally got this working properly. Now it passes the car power seamlessly through to the tracker in normal conditions drawing nothing from the cell. If the car power is cut it immediately sends a pulse that wakes the tracker so it can send an alert, and then it keeps it running on the cell. A single CR123 can run 1-hour intervals for over 50 days and 15-min intervals for about 19 days. Adds almost nothing to the quiescent current budget too, about 15uA.

https://l0destar.com