May I suggest adding a blink mode that blinks the firmware version? 
Also, what programming cable do you recommend buying? I bought one of these to tinker with the open source firmware so I want to make sure I get the right interface for it.
After the oct firmware it does blink the firmware date with 15 clicks.
Hank sells the programming cable.
Thank you atobe
This is a question that maybe only ToyKeeper can answer - by the way, a big thank you to her from a happy D4V2 user for the fantastic firmware.
(Low) power consumption being one of the considerations that possibly drove the selection of the levels of illumination for the currently available modes of the aux LEDs, I was wondering if it is physically possible in the existing hardware configuration of the D4V2 to make the aux LEDs even brighter than available using the current “High” mode.
Maybe having the aux LEDs on red (using a brighter “High” setting) could be useful as a source of illumination that preserves night vision for those times when a specialized red light flashlight is not in hand?
If it is indeed possible to have those aux LEDs even brighter, maybe a possible future revision of the firmware could have 4 modes for the aux LEDs - heartbeat,low, high, and turbo, the last mode corresponding to the physically highest possible level of illumination?
Brightness levels of the aux LEDs are defined by the hardware.
Yeah, I’m also dissatisfied with the levels in my D4SV2, particularly low red which is far too low. But can’t help that without a hardware mode. 
I know we each have different goals and uses for the aux LEDs. Personally, I like the lows being super low. It can be an alternative to trit vials that isn’t too bright on my nightstand. It would be cool if the brightness was adjustable, though.
Does the titanium version step down faster than the aluminium version when using Turbo?
Yes, heat can’t escape the emitter/driver area as fast.
TK,
Are the pre-complied .hex files dated 12/17 & 12/3 ok to use or are those the revisions that needed some thermal code changes? I want to update my Emisar’s and FW’s, but I’ll wait if there are improvements coming.
Thanks.
Aux LED brightness is determined by the resistors soldered onto the aux LED board. The firmware does not control that.
What the firmware controls is two things — whether the LEDs have power, and whether the MCU’s internal resistor is active. This allows for 4 states:
|
Power On |
Power Off |
|
|---|---|---|
|
Resistor On |
aux low |
aux off |
|
Resistor Off |
aux high |
aux off |
That is the full extent of the aux LED brightness levels available while the MCU is asleep.
Those should be fine if you’re careful to avoid letting it overheat, but the thermal regulation in those versions tends to react too slowly.
I’ve been making some pretty good progress with a thermal rewrite, but it’s not done yet. The most recent unpublished code regulates to a stable level very quickly on an Emisar D4, but it’s pretty bumpy on lights with a lower power-to-mass ratio.
Thank you for explaining. The aux lights are already very useful as indicators (locked/non locked, voltage) and quite pretty. It would be fantastic if in a future hardware revision or hardware version they could be powerful enough to be used for illumination : red for preserving dark adaptation, blue/green for use in strobes?, UV would be nice too ;-)
One can only hope!
I have a flashlight with R/G/B/UV in addition to white, all bright enough to use for illumination. It’s pretty neat. However, I’ve found that it isn’t particularly useful.
OTOH, I also made a R/Y/G/B lightsaber with custom firmware, and the colors work a lot better there. Since there are so many ways to use a full spectrum of colors, I made it so the user can design their own patterns in a manner similar to designing sounds on a synthesizer. I should probably get back to that project sometime…
Hm… I got mine finally… My ramping is changed into step ramping. Not smooth like it was… Its ramping with modes… Steps. Is it possible? How to change it to thr classical ramping please?
While the light is on, click the button three times.
Too bad the green color is being discontinued. Anyone knows where to get an old stock D4 in green?
can you please make the AUX LEDS “USABLE”. like we can turn it on to use as reading light or whatnot… right now the aux leds are only for “decoration” purpose for a lack of a better term…
pls make it usable with its own mode… click and hold from off maybe. just an example… just make it usable
In its current form, the aux LEDs are not very useful for reading. The reasons why are:
- On low mode, they are far too dim to read with.
- On high, it may be bright enough to read with, but the beam pattern is very uneven.
- On high, the aux LEDs produce less light than moon mode, and use more power.
- There is no dedicated mode for aux LEDs. The closest it gets is if you set up lockout mode with the aux LED configuration you want.
But in an ideal world, how would you want it to work, in detail?
thanks… that changed my mind… haha… i was just thinking about the idea to use the red leds to “preserve” night vision like in the nitecore ec11. but then again the ec11 does not have a moon mode like the d4, which makes the red leds somewhat useful… but your point is spot on… no need for the aux leds as illumination anymore as there is a moon mode…
I've had my D4V2 since last summer and have EDCed it since then. I've put on various different firmwares since I got it and noticed a newer one 2020_03_18. I put it on this morning and verified that's the version installed via 15 clicks. After reading about setting the aux LEDs to show voltage the last few posts, I've decided that's what I want when my light is off. Previously, I had red set for off and blue set for lockout to distinguish between the two.
Maybe I'm doing something wrong but I never get just blue even with the voltage of my battery showing 4.1 via 3 clicks. The aux just show blue and red on at the same time with the light off. I stopped holding on 7 clicks when it seems rainbow is done and that is the result (tried it numerous times). I get red/blue aux on at the same time. I thought there were just 3 colors for the voltage- blue, then green, then red as voltage drops over time.