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J
The easiest way would be to disconnect the cable and measure on the side that plugs into the O3 and a ground anywhere on the flight...
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J
Set the meter to VDC. You should read between 9Vdc to 24 Vdc depending on your flight controller and battery. Be careful not to short...
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J
Check the red and black wires on the cable between the O3 Air Unit and your Flight controller. If that's good, use a volt meter and...
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J
Can you be more specific about what problem you're having? It sounds like you're saying the O3 powers on when you plug in a USB, but...