Merge pull request #10697 from TonyBlit/battery_doc
Small doc enhancements
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commit
67535941d8
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@ -175,6 +175,16 @@ amperage_meter_scale = (Imax - Imin) * 100000 / (Tmax + (Tmax * Tmax / 50))
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= 205
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amperage_meter_offset = Imin * 100 = 280
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```
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Measuring Imax requires a battery and an ESC that can both deliver and support max current for the duration of the measurement, so it's prone to big inaccuracies. Alternatively, current can be measured at a much lower throttle position and be taken into account in the calculations.
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Following the previous example, if we measured an Ibench current of 6A at 30% of throttle (1255 in the motors tab because (0.3*(max_throttle-1000))+1000))
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```
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Tbench = Tmax * bench_throttle = 850 * 0.3 = 255
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amperage_meter_scale = (Ibench - Imin) * 100000 / (Tbench + (Tbench * Tbench / 50))
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= (6 - 2.8) * 100000 / (255 + (255 * 255 / 50))
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= 205
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amperage_meter_offset = Imin * 100 = 280
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```
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#### Tuning Using Battery Charger Measurement
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If you cannot measure current draw directly, you can approximate it indirectly using your battery charger.
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However, note it may be difficult to adjust `amperage_meter_offset` using this method unless you can
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@ -191,7 +191,7 @@ void currentMeterVirtualRefresh(int32_t lastUpdateAt, bool armed, bool throttleL
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throttleOffset = 0;
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}
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int throttleFactor = throttleOffset + (throttleOffset * throttleOffset / 50); // FIXME magic number 50, 50hz?
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int throttleFactor = throttleOffset + (throttleOffset * throttleOffset / 50); // FIXME magic number 50. Possibly use thrustLinearization if configured.
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currentMeterVirtualState.amperage += throttleFactor * (int32_t)currentSensorVirtualConfig()->scale / 1000;
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}
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updateCurrentmAhDrawnState(¤tMeterVirtualState.mahDrawnState, currentMeterVirtualState.amperage, lastUpdateAt);
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