Hexbright Repair Keeps Torch Out of Landfill

The Hexbright was a Kickstarter project from a few years ago, to create an open source, rechargeable LED light. [Nick] quite likes them, and has learned a thing or two about keeping them operational.

The torches have a few key issues which [Nick] lists for us, before outlining the necessary repairs. These problems highlight certain design flaws, something one might expect for a hardware product from a new startup. Components inside are easily damaged if the device is dropped, and there is no reverse polarity protection on the battery.

It’s always disappointing to see a product in the marketplace fail to take into account such rudimentary things, but in the meantime, repair is always possible. The guide highlights the basic parts and tools required, which is important, but also goes the extra mile and gives important hints and tips on how to effectively execute the repair in a quick and easy fashion.

Overall, it may not be a hack, but what [Nick] has done both educated on us the mistakes made by a crowdfunded hardware startup and also taught us how to write a useful and thorough repair guide. It’s not just about the parts that need to be replaced, it’s about the best method to replace them. The details and the order of operations always helps – anyone that’s ever attempted a serious automotive repair knows this, for example.

We see a lot of great repair hacks here – like this excellent use of a 3D printer to reproduce belts for old hardware.

13 thoughts on “Hexbright Repair Keeps Torch Out of Landfill

    1. Hexbright users were expected to be smart enough to put the battery in the right way. The big red piece of plastic with an embossed “+” and black piece of plastic with an embossed “-” isn’t enough for some people, I guess.

      It’s a cool flashlight, with a really good weight and feel to it, a nice very white LED (instead of that bluish tinge so many had before then), and a decent beam pattern. I’ve never reprogrammed mine, which was largely the reason I bought it. It may have changed since last time I looked, but back when I did, there was a version of firmware published, but not what was actually in the light, nor were the schematics available.

      1. Doesn’t sound particularly open-source to me. Want an open-source LED flashlight? Well, do you have a battery, resistor, and an LED?

        What would you program into this thing? Flash patterns?

  1. I reprogrammed mine to add a random strobe mode, plus changing the brightness depending on how I rotated the flashlight. I never did find a legitimate use for the reprogramming but it’s a good flashlight nonetheless.

  2. I was one of the people that worked on development of the HexBright. My friend and I got on board with the project when the original electronics guy bailed. At that point it was already running late, the budget was getting close to crossing over to the wrong side of the break-even line, the circuit design was a little bit of a mess, and nobody had even started thinking about software. My friend did most of the work fixing up the electronics, and I did everything software. I wrote the firmware, made sure the arduino bootloader worked on it, and even figured out how to set things up so the factory in China could program lots of them fairly quickly. We did our best to save the kickstarter, but at that point any big redesigns were out of the question.

    Nick is absolutely right about all of the problems. We actually discovered the crystal breaking problem on the very last pre-production prototype. I still have a really beat-up case laying around from when we were testing just how hard of a drop it takes to break different brands of crystal. (Spoiler: Every brand with that footprint seemed about the same, for us it always took more than a six foot drop onto concrete, and impact forces normal to the board plane seem to be worse than tangential.)

    Still, fun to see it pop up on here after all these years. :)

    1. Nice, thanks for the confirmation! I am the person who wrote the blog article. Some questions:
      Was the oscillator you used MEMS based ( I was reading this marketing on how MEMS based oscillators are more mechanical shock and vibration resistant http://ww1.microchip.com/downloads/en/AppNotes/00002340A.pdf )?
      Why no reverse polarity protection? I would gather that a simple diode could have been added for protection.
      Also lastly, what happened to the production of these fine lights? Did the demand drop?

      1. If you’re working with stable power (mains, rectified), sure you can use a diode. But ideally you want a PNP transistor over – with gate hooked to positive. Leakage and waste heat is cut to a minimum. And in battery operation, saving every uW matters.

        If I use mains based power, yeah, I use the diode on -. It works, and doesnt usually have too much losses.

  3. One of the best flashlights I have owned actually. I bought two and later bought the upgraded lenses and Cree LEDs for the Hexbrights. The upgrade parts really fixed and changed the output of the flashlight. Still using them to this date, keep one in my car and the other in my backpack.

  4. If i had one of these flashlights, i would put in the 8MHz internal oscillator bootloader (Like the Lilypad) 8 MHz is plenty enough and the accuracy of xtal isn’t needed in a flashlight anyway. Problem solved (with the xtal at least)

  5. Yup, Andrew is 100% correct. He and another EE came in and helped me straighten out the electronics. We made improvements along the way and although I was tempted to do a complete refresh, LED flashlights are a “me too” industry. There are just too many companies. Still, I was happy to do it, learned a lot along the way, and very glad there are people out there who still like the overall use and feel.

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