powerblade
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lab11
PowerBlade isn't reversible
Need to come up with a solution to allow PowerBlade reversibility.
The problem, is that a load at 10 W one direction measures identically to a load at 0 W the other direction. Put another way, we don't know which direction we are plugged in. However, it is easy to tell the difference with higher wattage loads (~20 watts and up). For example, a 100 watt load plugged in backwards will read -100 W.
One solution that might work for now, is to keep track in FRAM of which direction you are plugged in. If you ever register multiple readings less than -20 watts (or some number like that) make the decision that you are backwards and reverse the real power logic. This will still allow us to detect a 0 W load, as long as the load has previously drawn greater than 20 W.
How do you reset a powerblade's orientation if you move it to a new device?
On Fri, Jul 22, 2016 at 3:02 PM Branden Ghena [email protected] wrote:
Need to come up with a solution to allow PowerBlade reversibility.
The problem, is that a load at 10 W one direction measures identically to a load at 0 W the other direction. Put another way, we don't know which direction we are plugged in. However, it is easy to tell the difference with higher wattage loads (~20 watts and up). For example, a 100 watt load plugged in backwards will read -100 W.
One solution that might work for now, is to keep track in FRAM of which direction you are plugged in. If you ever register multiple readings less than -20 watts (or some number like that) make the decision that you are backwards and reverse the real power logic. This will still allow us to detect a 0 W load, as long as the load has previously drawn greater than 20 W.
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It should automatically swap directions whenever it sees a load less than -20 W. So if it's moved and flipped, it should automatically detect that when the load turns on.