#The "I'm tired of hacking at this at least it works" fan controller

13 messages · Page 1 of 1 (latest)

slender flicker
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Tried a custom build with an AliExpress BLDC fan controller. I think it might have been underpowered, but it made a lot of noise and didn't reliably start the motor. Went back to reverse engineering the remote protocol, and got to the point where I had the esp32 attached to the board and working.

Turns out the power supply was not up for continuously supplying 1-2W and started thermal cycling after a couple minutes. Unfortunately, the 5 volt supply is transformerless, so I had to come up with something that would isolate the two separate ground levels. Threw together a simple pc817 optocoupler build. No dice. Oscilloscope told me that it was discharging too slowly.

Picked up some cheap 4N25 opto transistors. Probably counterfeits but with a Little help from the internet and my first configuration only working when the oscilloscope was attached, figured out how to make them dump power fast enough to signal the motor controller.

So, we end up with the umbilical to the brain box configuration.

PXL_20240823_020051815.RAW-01.COVER.jpg
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The "I'm tired of hacking at this at least it works" fan controller

wanton blaze
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Very slick package! Also I think my parents had the same salt shaker growing up 😅

slender flicker
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I learned you can fit a Meanwell enclosed 5v switch mode power supply straight to the 5v and gnd pins of the C3 devkit-02

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Those 2 close pins will fit in the pitch between 5v and a gnd pin

MEAN-WELL-IRM-02-03-05-10-15-20-Modular-Power-Supply-AC-to-DC-3.jpg
true vigil
slender flicker
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I would definitely not sell this. It should be pretty safe, I put glue-filled shrink tube over the HV pins

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If I was going to sell something I'd design and order circuit boards. This was just a "screw it, I'm iterating fast and will get something that works."

slender flicker
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Got this working with the load-less z-wave dimmer though the dimmer component isn't used either (because it's a Jasco with no indicator). Used the scene control up/down with "pressed" on up as on/increase speed, down as decrease speed, and "held" down as off

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kind of tempted to replace with a wifi switch though just to make the response more instant

runic flume
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Any pictures of the aliexpress board and link or search term?

slender flicker
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Juyi Tech JYQD-v8.8B

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I think they might have a D revision now too but I couldn't tell you the difference.