Full Fly-by-Wire Electric Outboard (8): Current Measurement Circuit & Code (3)

Connecting the motor and modifying the oversampling …
↓↓↓ Complete description, time index and links below ↓↓↓

Last week was about noise reduction. First by modifying the RC filter – which failed – and then by oversampling – which kinda worked (link below). But we were still measuring a clean DC current. It’s time to measure the actual motor current.

First I’ll show you that oversampling works very well indeed. After we connect the motor it’s clear that the RC filter does little to remove the sinusoidal current component. In the end we get some improvement by modifying the oversampling.

00:00 Intro – connecting the motor and new challenges
00:44 Addendum – regarding oversampling noise reduction
02:01 Tests 1 – readings with the motor actually connected
09:55 Retrospective – ADC filter requirement and design
12:02 Results 1 – it ain’t working, because the design is bad
18:47 Requirements – properly done for the ADC filter
22:46 Design – modifying the ADC oversampling
24:17 Code – for “spaced out” oversampling
25:21 Tests 2 – of “spaced out” oversampling
28:09 Results 2 – some improvement, good enough for now
30:04 Wrap-up – next we’re measuring the voltage, bye

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