I recently upgraded the firmware of a Sofirn SP36 BLF LH351D 4000k (old version without powerbank-functionality) to Anduril 2 (and added two 5.1kohm pulldown resistors to the USB-C CC1 and CC2 pins to “ask” USB-PD compliant chargers for 5V using C-C cables). I also changed the button LED colors to red and yellow instead of red and green. The yellow LED’s seem to have a higher Vf than the green LED’s though, so the button LED is now unfortunately only visible on “high”. I tried decreasing the on-board current-limiting LED from 1k to 500ohm but that didn’t really do much… Is is possible to change something in the firmware to increase the lower button-brightness? Thanks!
(I flashed the “anduril.2021-12-13.sofirn-sp36.hex” file btw, and so far I noticed that SOS is missing from the Sofirn SP36 (Pro) & Q8 (Pro) diagram, but I won’t miss that haha)
I see, thanks for the quick response! Could I change the 1k resistor to maybe 100ohm to get a higher “low” brigness? The lowest I went to was 400ohm I think… Although when changing resistors the “output” voltage didn’t seem to change all that much so I doubt that’s going to give the desired effect, I suppose I just need to find yellow/amber LED’s with a lower Vf…
Thanks. I didn’t thought about checking it out before disassembly. A bit strange because the original fw3a has fet+7+1. I know that the new ones have fet+1, but I didnt know that the soft has changed too.
I used to post on here years back. This might be of use, it’s code for morse.
Edit: Should add, you have to go into the advanced menu 4 (adc) and hold the button down for awhile when you first flash it in, it’ll go through the adc options and if you keep holding, resets the light. This writes the necessary data in eprom. You can turn it off when it goes dark on the emitter and then it should work as written. I made quite a few of these lights, but in the end it was a fail. Noone really cares about morse. And the parts were expensive too. You need a decent inductor to safely put that much power into an emitter, and I figured out a neat trick on the tail cap to stop the arc. It turned out a fet and resistor simple. I ended up sourcing the inductor from isreal. The practical use turned out to be the usual. Guys were putting it on high and leaving it, burning out the emitters. It was all about high. Noone cared it was a morse code light with moonlight to blast. So that’s what I learned. I use it everyday for all sorts of things though.
Learned a lot here though. Some of you guys really know your stuff, couldn’t have created this without you.