My New Home Made ESP32 WLED 8 Channel Controller.

[OZ-Hornet]

Hi all. My first go at a home made ESP WLED controller.

Few SMD components to install I’ll update after testing.

Each channel has 10 AMP PTC fuse.

 

[AAH]

Polyswitches are fairly awful to be used as wire protection devices. The thermal derating curve shows that the 10A rating you'd get at 20C ambient varies to 7A if the ambient temperature was 40C inside an enclosure. If you were to do the silly thing that a lot of people do and jam multiple power supplies into 1 box or run a poorly ventilated box then at 60C the 10A rating drops to 4A. Of a greater concern if the same devices were used in Canada at Xmas time instead of 10A the trip current could be 16A. Also of a big concern is the trip time. An auto fuse will trip at double the rated current in about 0.1s. A 10A polyswitch has a 50A trip time of 6s.
IF a polyswitch were to trip the radiant heat from them would also potentially cause a cascading effect where the heat from 1 would cause adjacent ones to overheat and shutdown.

 

[MikeKrebs]

Nice job doing it yourself! Good luck with the controller.

 

[OZ-Hornet]

Polyswitches are fairly awful to be used as wire protection devices. The thermal derating curve shows that the 10A rating you'd get at 20C ambient varies to 7A if the ambient temperature was 40C inside an enclosure. If you were to do the silly thing that a lot of people do and jam multiple power supplies into 1 box or run a poorly ventilated box then at 60C the 10A rating drops to 4A. Of a greater concern if the same devices were used in Canada at Xmas time instead of 10A the trip current could be 16A. Also of a big concern is the trip time. An auto fuse will trip at double the rated current in about 0.1s. A 10A polyswitch has a 50A trip time of 6s.
IF a polyswitch were to trip the radiant heat from them would also potentially cause a cascading effect where the heat from 1 would cause adjacent ones to overheat and shutdown.
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I do have 14amp also. Aiming for only 600 max LEDs per controller across 8 channels.

As the controllers are say $20-$30 max. I would rather spread it out. Also my injection is of a seperate PCB also. So I would be max 100 WS2811 per fuse.

 

[OZ-Hornet]

Nice job doing it yourself! Good luck with the controller.

Cheers. This is my other hobby.