Hello everyone,
Before knowing anything about Proffie boards, or any other boards for that matter. It had struck me that in any Youtube install video, the host seems to always be very insistent (with good reasons) on the polarity of the battery.
This made me think that it probably happens too often that a user inserts his battery the wrong way.
So when I made my parts order from Saberbay, I decided to add one of these:
It is wired as per this picture:
However it is not yet soldered to the Proffie board.
I might have held my soldering iron a bit too long while soldering to it and I am worried I might have damaged it. What would be a safe way to test if the reverse polarity board is working properly ? I do have a basic multimeter. I tried to check for continuity between the negative battery tab and the negative wire coming out of the polarity fixer but I had none. However I had continuity between the positive battery tab to both positive and negative wires coming out of polarity fixer board (while no battery inserted) is this normal ? I am guessing I should test for voltage between the positive and negative after I insert a battery (the correct way first, followed by reversing the battery and the voltage should be the same and not reversed.
Thank you for any advise.
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Those are just MOSFETs on that board it looks like, so when they’re unpowered and floating continuity between things isn’t going to really be measurable.
Tbh the easiest way to test it is probably to just unsolder the board/blade connections, plug in the battery, and measure what you get on the outputs and verify things are correct.
You might need to connect a resistor of some sort to the output to make it work properly, then you can measure it.
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How many ohms ? A big one or a small one ?
This is what I have “interconnected” at the moment:
I had to connect the Bluetooth negative to the negative battery holder pad directly because I don’t have the space to make the wire go to the reverse polarity protection board. But the positive wire of the Bluetooth is not yet connected to anything.
Also the negative wire of NPXL isn’t connected to anything either.
Should I unsolder the positive of the NPXL connector or is it fine like that to test with the battery in the “correct” orientation ?
Also it is my understanding that I probably don’t need the polarity protection because the Proffie V3.9 already is protected and so is the NPXL connector. Is this correct ?
Almost anything works, although if the resistor is small (less than 10 ohms) it might get hot.
I would probably use something around 1kohm or so.
The problem with testing things without the resistor is that without a load, the output is “floating”, and can kind of take any voltage value. With a (small) load, the voltage should settle to something real and measurable.
Only some neopixels have reverse polarity protection.
The NPXL connector may have pixels with reverse polarity protection, but it wouldn’t protect the blade. The blade may or may not have reverse polarity protection, the same goes for any accent LEDs you may have.
I will try that tomorrow. Thanks.
Cool, thanks so it is not a “useless” addition which I was starting to beleive.
