|
Inferring current MAY be easier...
This all sounds pretty tricky to an escapee from M.E. land...
For my money, I would rather infer current. You know battery voltage. Assuming you have consistant batteries (big assumption I know), your battery has an internal resistance that will give you some information about battery current.
AND...
you can refine your estimates by doing a test. It would be possible for example to stall a motor of know resistance for a very short time (say by moving an arm against the stop), when you first install your battery or upon first power up.
If you watched battery voltage during this test, you could calibate your sensor (i.e. the built in battery voltage sensor) to various current levels. It would be also possible to give the motor several different voltages in order to get several data points.
For my money, this seems the better path than putting resistors in your battery path.
Joe J.
P.S. Of course, there are other ways to infer current as well, but that is a message for another day -- perhaps for another year.
|