@ivanv wrote:
This is a weird one.
I'm using a APM2.5 board with a 3S battery, 3DR 915Mhz telemetry radio and an Attopilot 180A to measure voltage and current.
When I am connected to the APM via USB, then Mission Planner reads about the correct voltage, about 12.4v for a fairly full battery charge, this checks out against a multimeter. But when I switch over to the 3DR radio, the voltage reading drops to about 8.5 - 8.6v, which is not what the multimeter reads.
Does anyone have any idea whats going on? Could it have anything to do with the fact that Attopilot output is scaled to 3.3v? The ratio between the voltage via USB & via 3DR radio is almost 3.3/5v, but not an exact fit.
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