*BLF LT1 Lantern Project) (updated Nov,17,2020)

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DaveyC
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Sofirn wrote:
polarweis wrote:
Is there still a coupon for lt1?

Yes. Will send it via private message.

Will you send it to me too please?
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Lexel wrote:
at least there should be 0 Ohm, if they put 10Mohm there we got a problem

Yes, I was told it is 0 Ω

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DudeMan
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after watching Matt’s video i ordered one. (used his link/code) thanks Matt! Beer
glad to support your channel. i also let ads run for all your videos.

our power has been going out more and more frequently here. this is just what everything i want in a light.

will the current version (third run (version2?) work with a 1A wall charger? wasn’t the earlier one with a trim POT adjustable?
i have an external charger (Zanflare C4) but would prefer using my crappy 1A charger with magnetic connector to save wear on the connector, threads, and batteries which are button top Sammy 35E.

SIGShooter wrote:
Sofirn wrote:
Revised driver - Does not matter what combination of AMC pads 4, 5, 6 and 7 are closed. - Added location for 0 ohm resistors so manual soldering of pads 4 and 5 is not needed. - Added 2 resistors to allow a USB-C charger to work with the LT1. - This last piece should be tested before starting a full run.
I believe that what this means is that 4 & 5 and don’t need to be soldered as before and if you want less output then you can unsolder the resistors. You can close 6 and/or 7 (either with solder or pencil lead) to get more output but unlike prior driver versions it doesn’t matter if 7 is done but not 6. Before 6 had to be closed if you also wanted 7 closed.

i hope this is the case. perhaps lost in translation? DBSAR’s video Thumbs Up shows that 5 FETs seems to be the sweet spot for efficiency, brightness, and temps.
them saying 6 and 7 are ‘closed’ makes me think they are enabled. in electronics ‘closed’ means connected, and ‘open’ mean broken/disconnected.

but i’m sure most you know that. Silly

can’t wait to get my hands on this.
/richard

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DudeMan wrote:
after watching Matt’s video i ordered one. (used his link/code) thanks Matt! Beer
glad to support your channel. i also let ads run for all your videos.

our power has been going out more and more frequently here. this is just what everything i want in a light.

will the current version (third run (version2?) work with a 1A wall charger? wasn’t the earlier one with a trim POT adjustable?
i have an external charger (Zanflare C4) but would prefer using my crappy 1A charger with magnetic connector to save wear on the connector, threads, and batteries which are button top Sammy 35E.

SIGShooter wrote:
Sofirn wrote:
Revised driver - Does not matter what combination of AMC pads 4, 5, 6 and 7 are closed. - Added location for 0 ohm resistors so manual soldering of pads 4 and 5 is not needed. - Added 2 resistors to allow a USB-C charger to work with the LT1. - This last piece should be tested before starting a full run.
I believe that what this means is that 4 & 5 and don’t need to be soldered as before and if you want less output then you can unsolder the resistors. You can close 6 and/or 7 (either with solder or pencil lead) to get more output but unlike prior driver versions it doesn’t matter if 7 is done but not 6. Before 6 had to be closed if you also wanted 7 closed.

i hope this is the case. perhaps lost in translation? DBSAR’s video Thumbs Up shows that 5 FETs seems to be the sweet spot for efficiency, brightness, and temps.
them saying 6 and 7 are ‘closed’ makes me think they are enabled. in electronics ‘closed’ means connected, and ‘open’ mean broken/disconnected.
but i’m sure most you know that. Silly

can’t wait to get my hands on this.
/richard

I have tested the LT1 and it works with most 1 amp wall chargers, though some of the lower amp chargers get quite warm. (as the LT1 is shipped factory default as 1.5 amp charge rate) the factory 5-chips per-channel is a good balance of output & run times for most uses, while the two extra chips can be bridged to add some output lumens increase with a slightly lowered run times.

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

DudeMan
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DBSAR wrote:

I have tested the LT1 and it works with most 1 amp wall chargers, though some of the lower amp chargers get quite warm. (as the LT1 is shipped factory default as 1.5 amp charge rate) the factory 5-chips per-channel is a good balance of output & run times for most uses, while the two extra chips can be bridged to add some output lumens increase with a slightly lowered run times.

thank you sir. i have a ‘1.5A’ iPad wannabe charger that shits the bed if going over 1A. metered with a UNI-T UT658.
thanks for confirming the 5-chips.

can’t wait to get your wonderful creation in my hands.
cheers

/richard

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DudeMan wrote:
will the current version (third run (version2?) work with a 1A wall charger? wasn’t the earlier one with a trim POT adjustable?

i have an external charger (Zanflare C4) but would prefer using my crappy 1A charger with magnetic connector to save wear on the connector, threads, and batteries which are button top Sammy 35E.

As DBSAR says, many 1A chargers will still work with the stock LT1 (even though the LT1 expects 1.5A), but the charger may get very warm.

If that worries you – or the charger refuses to work at all – there is a way to reduce the LT1’s charging current, which DBSAR actually added to the original specification for people with small solar panels and low-powered chargers to use.

First a photo of the driver:

The trim pot doesn’t do anything in a stock lantern – it’s only there for modding. I think it was meant for auxiliary LEDs.

However, if you look below the ‘L’ in “BLF” in the driver photo, you’ll see the word “charge” in white. There’s a solder blob to the lower right of the ‘e’ in “charge”.

If you have a soldering iron, you can melt the solder and break that connection. This will set the LT1’s built-in charging controller to 0.75A instead of 1.5A.

If you get a more powerful charger in future, you can set the LT1 back to 1.5A by putting the solder blob back and restoring that connection.

DudeMan
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@Phlogiston

perfect explanation. thanks! Beer
i’ll see how my adapter does.

/richard

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DudeMan wrote:
@Phlogiston

perfect explanation. thanks! Beer
i’ll see how my adapter does.

/richard

Yep, as Phlogiston mentioned, the LT1 was designed with off-grid users in mind, and able to reduce the amp-draw charging rate to 0.75 amps for those with older lower-amp chargers and power supplies. One example is in many 2010 ~ 2017 RV’s, boats, ATVs have USB charger ports that can only supply 1-amp outputs. Another example is when i tested some smaller portable Solar panel chargers & power banks. i could connect one LT1 to many of them and they would charge, but if i connect two, the voltage would fall so low the lanterns would not charge at all. But when i reduced the charge rate in the LT1 lanterns to the 0.75 amp setting, then i could charge two at the same time from a tiny 10-watt solar charger in one day under good sun light after running them for 5-hours each night at 60 ~ 70% brightness.

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

DudeMan
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DBSAR wrote:
Yep, as Phlogiston mentioned, the LT1 was designed with off-grid users in mind…

right on. you are very thorough on your design methods. something i really respect, and appreciate.
this light is going to touch a lot of lives in a much needed way sir. well done.

on top of the standard functions, the ‘nice to haves’ such as candle mode, and sunset are welcome indeed.
thanks Toykeeper!

cheers Beer
/richard

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I’d like a code to purchase this…would be perfect for camping!

Sparky.
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The group buy is over.

If you want the same discount as the group buy — Sofirn is making this possible on their web site .. Selling the BLF LT1 for 49.99. As the web site states — This is for a very limited time .. So If you want one — Here’s where to order:

https://sofirnlight.com/blf-lt1-p0013.html
DudeMan
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ordered mine last sunday the 12th from amazon, it shipped monday (china time)
hoping it will be the usual week in customs, flown, week in customs then to my door.

one question… what the hell is this thing? lol

an extra button not shown to scale?

Watermanchris
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DudeMan wrote:
ordered mine last sunday the 12th from amazon, it shipped monday (china time)
hoping it will be the usual week in customs, flown, week in customs then to my door.

one question… what the hell is this thing? lol

an extra button not shown to scale?


Yes. It’s an extra button
DBSAR
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DudeMan wrote:
ordered mine last sunday the 12th from amazon, it shipped monday (china time)
hoping it will be the usual week in customs, flown, week in customs then to my door.

one question… what the hell is this thing? lol
an extra button not shown to scale?

Spare button cap Big Smile

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

DudeMan
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ah, thanks folks. Beer

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The BLF LT1 is safe to charge with my Ipad’s 2.4 amp, 12W power adapter right? I also have a couple of Anker Powerport PD2 wall chargers, will they be also fine to use with my blf lantern?

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Sofirn wrote:
DBSAR wrote:
MNLegoBoy wrote:
Sofirn wrote:
And Type-C USB cable can fit in the newest LT1 lantern.
Will that be able to do C-C or still A – C

we are hoping the C-to-C will work with this updated batch.


There are old firmware and the lasted fireware in batch 3. If you want to get LT1 lantern with the latest firmware which supports USBC to USBC and USBA-USBC charging, please tell us in your order.

I ordered on 3/23 with special note in the order comments requesting the latest firmware. Light arrived in good condition on 4/17.
It does have the 5.0 driver but firmware is 2019/11/29. If latest firmware is deal breaker for you you might want to wait till the 4th batch.
C to C is not a deal breaker for me but I hope to test in in the next day or two.

I do not have the programming key for the exposed pads. If the wires are long enough I will try to re-program with the chip clip but i will not de-solder anything to do it.

lmorrison17
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DBSAR wrote:
DudeMan wrote:
ordered mine last sunday the 12th from amazon, it shipped monday (china time)
hoping it will be the usual week in customs, flown, week in customs then to my door.

one question… what the hell is this thing? lol
an extra button not shown to scale?

Spare button cap Big Smile

This was a huge boon to me I used the spare button on a C8F with a mtn lighted switch it was exactly what the doctor ordered to make my adaptation perfect.

ggreen57
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I am new to BLF. Can I get in on this lantern?
Looks like I can buy it on Amazon. Is there a BLF discount code?

George Green

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Read Post 10939.

DBSAR
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Wave180 wrote:
The BLF LT1 is safe to charge with my Ipad’s 2.4 amp, 12W power adapter right? I also have a couple of Anker Powerport PD2 wall chargers, will they be also fine to use with my blf lantern?

Yes, any of those chargers should work fine charging the LT1.

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

nick779
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lmorrison17 wrote:
Sofirn wrote:
DBSAR wrote:
MNLegoBoy wrote:
Sofirn wrote:
And Type-C USB cable can fit in the newest LT1 lantern.
Will that be able to do C-C or still A – C

we are hoping the C-to-C will work with this updated batch.


There are old firmware and the lasted fireware in batch 3. If you want to get LT1 lantern with the latest firmware which supports USBC to USBC and USBA-USBC charging, please tell us in your order.

I ordered on 3/23 with special note in the order comments requesting the latest firmware. Light arrived in good condition on 4/17.
It does have the 5.0 driver but firmware is 2019/11/29. If latest firmware is deal breaker for you you might want to wait till the 4th batch.
C to C is not a deal breaker for me but I hope to test in in the next day or two.

I do not have the programming key for the exposed pads. If the wires are long enough I will try to re-program with the chip clip but i will not de-solder anything to do it.

Were firmware changes since then a big deal on the LT1?

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I haven’t kept super close track but I think 11/29 might be the latest. That’s what I have in my lantern. The only noticeable changes are SOS, and I think improved button press stability.

PocketSammich wrote: I don’t need this, but I want it. Please sign me up.

nick779
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sbslider wrote:
I haven’t kept super close track but I think 11/29 might be the latest. That’s what I have in my lantern. The only noticeable changes are SOS, and I think improved button press stability.

Is there an easy way to check the version? I thought TK was going to write that into Anduril at some point, but I dont remember if it ever happened.

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not sure. I thought it might be in there already, but I tried several click variations up to 12 and didn’t find it.

Wait, I did a quick search and found this” https://www.youtube.com/watch?v=mrAM7HylEA8

15 clicks from off.

verified my fw reports 2019 11 29

PocketSammich wrote: I don’t need this, but I want it. Please sign me up.

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There have been two since 11/29. I dont know what the changes are but I suspect one of them enables C to C charging. The wires were long enough and I flipped over my driver my driver to flash 2020-03-18.
Took all of 5 minutes but it was a little off putting when Sofirn comes in here and states you only have to ask for the latest and when you ask you still dont get it.

But its more than that I have not had Sofirn get a single order right all year.
I ordered a SP10s w/batt and charger, did not get the batt and charger.
I ordered Q8 Anduril I received the older style Q8 with the flats on the body and Narsil UI.
Do they even bother to do more than glance at the orders?
I do appreciate the great lights at great prices, that’s why I keep giving them my money but for gods sake will it cost them money to get it right?

sbslider
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lmorrison17 wrote:
There have been two since 11/29. I dont what the changes are but I suspect one of them enables C to C charging.

I’m not 100% sure, but I doubt any fw update will change the way the light charges I don’t believe any pin on the controller interfaces with the charger chip. I’ll happily accept correction on this opinion.

PocketSammich wrote: I don’t need this, but I want it. Please sign me up.

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we are late march now.. where is the 3rd batch Davie

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lmorrison17 wrote:
There have been two since 11/29. I dont know what the changes are but I suspect one of them enables C to C charging.

No. The firmware is completely unrelated to C-to-C charging. That’s entirely a hardware matter, and cannot be affected by firmware on the attiny85.

As for firmware though, some changes relevant to the lantern are:

  • 2019-09-24: Added version check function (15+ clicks from off), and an automatic ramp-down if button is stuck.
  • 2019-09-28: Added automatic lockout if button remains stuck long enough.
  • 2019-10-02: Increased brightness of LT1’s muggle mode ceiling.
  • 2019-11-18: Added SOS mode.
  • 2019-11-19/20: Rewrote interrupt handling system to fix several infrequent issues like occasionally missing a button click while asleep. This also changed how it handles electrical noise conditions, by making it attempt to boot normally after an error instead of staying in a blinking error mode.
  • 2019-11-29: Adjusted LT1 tint ramping brightness correction formula (was using measurements from a prototype, adjusted to match people’s reported values for production units).
  • 2019-12-03: Adjusted LT1 tint ramping brightness correction again, based on more accurate measurements. Should keep power use and brightness closer to flat while changing the tint now.
  • 2020-03-16: Rewrote all ADC-related code. Almost no effect on the lantern though; basically it should just make voltage readouts more stable.
  • 2020-04-13: Recalibrated internal timing loop; time-based functions like strobe and beacon should be a little more accurate now.

There were lots of other changes too, but not relevant to the lantern.

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DBSAR wrote:
Lothar wrote:
Hi DBSAR, is there any update on the LT-1 with powerbank functionality?

not yet, as its a planned future deluxe project version. We were looking to get the colored versions and all current orders for the current LT1 fulfilled first.

Seeing as how colored versions are now problematic due to constraints, here I am voting again for focusing on adding the powerbank feature. Seems a waste to lug around 4×18650 and not be able to dip into those power reserves if light is not needed in a particular situation. Nitecore and Fenix both have lower priced lanterns with powerbank features so shouldn’t too much of a stretch. Thanks again!

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