This is an alarm that will trigger when the total voltage of an battery get below a given point.
In this case:
3 cell li-po battery - 3,4 pr cell is the limit.
So the vehicle should be on the ground at:
3,4 *3=10,2.
So in this case a margin is required. It is set at 10.4 and the alarm start here.
When the voltage gets to 10.2 V the alarm goes off. The alarm is illustrated by a diode. It is possible to change it to a siren.
I have found some inspiration on the internet so it is not my own design, I have only modified the components to meet the requirement of my system.
