which Andúril 2 build for a custom light?

Flashlight Modding and DIY Parts
1

Hey, I’m looking to build a proof-of-concept thrower usning an Attiny85 dev board and a MeanWell LDD- series driver. I’d like to not have to roll my own build of Andúril 2, all I’ll be needing is a single <1kHz PWM output and an aux light output, maybe RGB eventually. Is there a compatible driver out there whose binaries I could use?

2

@wolfgirl42, @gchart and @thefreeman (in no particular order) are the people you want to talk to.

Interesting project, BTW. if you can, please keep us posted on your progress.

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3

FWIW, I don’t think any of the t85 builds have RGB. I’m not sure if that can fit, because I don’t think I’ve ever tried it. Plus, there usually aren’t enough pins. Also, it may be difficult to get the PWM to go under 1 kHz, especially on t85. IIRC it only has 8-bit PWM, and if you under-clock the MCU too far it stops being reflashable with standard adapters because the flashing protocol runs too fast for it.

However, I’ve seen people using little adapters to fit a t1616 into the t85 slot on FW3A drivers. This would provide plenty of ROM, and the ability to slow down the PWM, and extra pins for connecting RGB.

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4

Thank you both. I’ll start off with the optics and mechanics and use a func gen or a 555 timer for control for now before I’m able to procure a 1616 dev board. The 85 is not a hard requirement, it was just available cheaply as part of an Olimex kit.

I’ll post pictures as things start to materialise.

5

You can buy an Xplained Nano 416 and reflow a T1616 on it, conveniently you can flash the chip directly from USB, that’s what I use on a breadboard for various tests.
Farnell has both (just one Nano though :sweat_smile: ), you just need a 30€ order for free shipping.

Edit : TME also has them.

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6

It’s gonna be another one of these btw.

7

accidentally switched the psu on in cv mode and burned the W1 :c

8

:sob:
:flashlight: :smoking:
:headstone:

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9

Ouch.

In terms of a custom build, the easiest way is to pick an existing driver layout for the t85 and leave three pins free for RGB. I’m currently partway through making an optimised and modified build for a t85 light myself and working on backporting some of the space optimisations to the earlier pre-multichannel branch for that, but multichannel does build for a t85, to get RGB working might need some code changes if it was written without consideration for the t85, but there might be space with the optimisations backported if nothing else.

e.g. the Emisar D4 (v1) hwdef is:

 *           ----
 *   Reset -|1  8|- VCC
 * eswitch -|2  7|-
 * AUX LED -|3  6|- PWM (FET)
 *     GND -|4  5|- PWM (1x7135)
 *           ----

So you could use pins 3, 6, and 7 for aux and then just use a modified Emisar D4v1 build to only hve a single PWM table and to support RGB.

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