

Lemmy is a fine place for it, saying it’s a hive mind may have some truth, but it’s also a copout. Just back up controversial opinions with some sources.
You said you read things that “got you to this point.” What was it you read? I’d be interested in reading it.
It’s possible to still track speed using a video feed instead. You just have to know the distance between two static points within the videos frame. Time naught = passes first static point, time final = passes second static point.
Velocity = distance / time
Although I’m not sure how or if this would impact the battery life of the device.