I want to hook up a 3 wired battery monitor to only show voltage while the board is on.
As far as I understand, battery monitors with 3 wires don’t plug straight into the battery, but instead use an external power source to measure the battery voltage. This gave me a supersketchy idea.
I am using the dual ESC substitute from eBay without an anti-spark switch. The only switch I have on the board is the switch on the ESC. I found a spot on the ESC which only starts giving off voltage when the ESC is on.
Is it possible to use this spot as a power source to power the battery monitor? The spot gives off around 8-10 volts and considering the voltmeter doesn’t pull over a few milliamps, then it should be fine, no?
Alternatively, since the switch and the included battery monitor on the ESC both light up once the board is turned on, would it be okay to tap power from one of their sources? I think there is even a 5v marker on the ESC…