D.I.Y. Illuminated tailcap

I’ve ran into an unexpected glitch with the S2+ build and the offtime based STAR_1mode firmware when using the lit tailcap. The driver will operate correctly when a battery is first inserted, but if I return and try some minutes later the light will not turn on unless I remove and replace the battery.

If I change to a standard (not LED lit) tail the driver operates perfectly all the time, so it has something to do with the lit tail. Any suggestions on what the issue may be or how to resolve? Will this still require a bleed resistor possibly?

The only changes I made to STAR_1mode were to reduce #define LVP_MIN from 7 to 6, uncomment #define MODE_LOW, and comment //#define MODE_TURBO. Here for reference in case it’s at all helpful now or to anyone in the future :):
https://www.dropbox.com/s/ozgfqq3ejh8lnit/STAR_1mode%20Single%20Low%20Mode.7z?dl=0

Ist this the correct circuit for rev3 board?

Thanks!

By default yes, but there are extra traces so you can split the two sides of the board and have a different resistor value for each LED

edit: technically the order of the circuit (where the button is) is flipped around in your drawing, but it doesn’t matter for what I think the root of your question was

Thanks for fast answer….so for default config one resistor for both leds is enough?

yes.

Thanks for your help emarkd! I’ll give it a go. Also thank you Pilotdog, I love these lighted tailcaps.

Whats your advice for resistor value when using only one resistor and have two blue leds (2.85V) on the board?

Based on my experience I’d recommend about 20kOhm. Blue has the lowest Vf of the ones I’ve used and benefited from the highest resistor value to appropriately dim.

Update: Added a 510mOhm bleed resistor on the driver and it operates perfectly now. I thought that the offtime based firmware should not require a bleed resistor for operation :confused: ?

Hey all. The clear S2+ gaskets were waiting for me yesterday when I got home. Now I just need to pick up some stamps. :slight_smile: I haven’t really mailed anything in a while. I’m going to send some out in the next few days and I’ll see if I can get Richard to take some so he could just throw them in if you happen to be in the US and ordering something from Mountain Electronics. They come in a sheet like below so you just need to pop them out. Hopefully these will make the glowing S2+ tails a little better.

Once you pop it out you’re left with this:

Yes!

I received some clear gaskets yesterday (thanks J-Dub!) including a few extras. If anyone needs one please let me know and I’d be happy to drop some out in the mail :).

Now to get some PCBs on order. I believe it should be Rev5.1b for 14mm boots and I just use this above the stock switch in place of the metal washer? Which ones would you recommend for modding a S2+ metal boot tailcap?

That would be the one! I need a couple, but was on the early list!

Thanks for the quick confirmation and please let me know if I can help in any way.

Did you ever get this problem worked out? I’m afraid I might run into the same issue on my S2+ and I don’t need another reason to drink :).

Great idea sending some to RMM. I hope to get a few myself.

BTW, Kaidomain has 10mm translucent buttons now.

Awesome. Let me know how they work out. I have more. I’m going to try to get maybe 50 or so in the mail to Richard in the next couple days.

How many did Simon send you?

Hey mattlward. Was I supposed to send you some clear rubber seals or are you talking about something else? If you need some send me a PM with your address and how many you need. Most of the rest I’ll ship off to Richard.

I don’t recall exactly but it was over 200. I just counted what I still have. 147 left and I think I sent out somewhere between 70 and 80 in total already to those who asked. So, I’ll probably send 100 or so to Richard and then a few here and there to whoever needs them. Anyone I send them to will get more than they need giving the opportunity to pay it forward if another BLFer needs a few. If anybody wants some just send me a PM.

Edit
The bummer is Simon was supposed to send a bunch to djozz too. When I reminded him he said the equivalent of “oops”. He’s going to make some more though. It was my intention for him to just switch over to clear for all the future S2+ models to make these switches easier going forward. Waiting for confirmation on that.