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patagonaa / isdt-cm1620

Documentation and code for the ISDT CM1620 charging module
MIT License
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Latest Firmware has wider voltage range #2

Open megamaniac opened 1 week ago

megamaniac commented 1 week ago

Just a note for your Readme: whatever the latest firmware is for this CM1620 seems to allow a much wider voltage range. Using the Android App all cell chemistry 'options' allow changing the cell voltage in a much wider range, so it doesn't seem to matter what chemistry you set you can use it to charge any other chemistry assuming the voltage is correct.

patagonaa commented 1 week ago

Sounds great, did you try actually setting it outside the range and start charging? The App has always allowed a pretty wide voltage range, but the charger would just throw an error and if it was set outside the ranges in the readme.

If you did try and it actually works now that would be awesome, then I'll update the readme

megamaniac commented 1 week ago

I was almost certain that I could answer "yes I tried it and it worked"

But thought I would double check. So I plugged the same power source I had plugged in before back in and it burned out and let out the magic smoke. Second one to do this. It's going back to Amazon... there are some serious problems with the design of the hardware for this to happen.

I had assumed the first one I had was faulty, so with this one I was tentative and plugged in a low voltage (12v) supply first, which allowed it to boot fine. It also booted with a PC plugged into the micro USB port. I subsequently plugged in a 58v power supply which worked so I thought for sure the first one was faulty. But now I just plugged this one back in and poof!

It's such a shame, as nothing else like it really exists. I have a feeling iSDT abandoned it because it's riddled with issues.

patagonaa commented 1 week ago

Yea as it says in the readme: I've also had one release its magic smoke (though in my case it was in a weird configuration of parallel connection of multiple units, which might've been the issue).

I guess there's a reason they are so cheap.

Next time I'm using mine I'll try to remember to upgrade the firmware and check if other cell voltages work then.