Edgerton, A High-Speed LED Flash #DIY

2019-05-21 – This project is entered in the 2019 Hacakday Prize contest.  If you have any feedback or like what you see, please consider following, leaving a comment, or liking the project at https://hackaday.io/project/165622-edgerton-a-high-speed-led-flash.  Thank you!

2019-07-25 – The list price of the well-designed Vela One has recently dropped.  I originally quoted it at about $1,750 CAD but unfortunately don’t have any proof.  As of today, the Vela website indicates it is exactly $1,526.70 CAD. The archive.org website shows that the price has indeed fluctuated over time.

2019-08-01 – A big THANK YOU to NQTRONIX who has kindly gifted me an active light probe of his own design.  The probe will be used with an oscilloscope to measure the flash duration, trigger response time, light output -v- current, and other helpful things.  I will update this post with the data once testing commences.  NQTRONIX put a TON of time into designing, testing, and optomizing his probe.  Please consider checking out his instructable page and leaving him a like or comment!


EDGERTON

Named in honour of the legendary Papa Flash.

Some time ago I designed and built a ballistic chronograph and used it to take some high-speed photos of bullets striking glass. The results were great, but the photos were somewhat limited by the standard ‘speedlight’ flashes that I used – there was always some motion blur. Edgerton is a ‘High-Speed Flash’ which uses LED’s to make one-microsecond flashes to freeze motion.

High-Speed Photo of Bullet & Broken Glass

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Edgerton, A High-Speed LED Flash #DIY

Cheap Trigger for High-Speed Photography

A simple trigger for high-speed photography is the ‘tripwire’ trigger.  Unfortunately few (if any) commercially available flashes are configured for this trigger.  Thankfully, an Arduino-based trigger controller is very easy to make.  I will also shamelessly plug Edgerton, an open-source LED flash specifically designed for high-speed photography, that can be tripwire-triggered without any major hardware!

How It Works:

A small bracket must be built for the muzzle of your rifle (or whatever you are using).  Two pins protrude from the end of the bracket and a fine wire is wrapped between the pins.  The pins are connected to a port (I use a 3.5mm audio port) which can be connected to Edgerton or the trigger controller by an extension cable.

When the projectile exits the muzzle, it passes through the wire and breaks it.  The two pins, which were once connected by the wire, are now ‘open’.  Edgerton or the flash controller detects that the pins are separated and a timer is started.  After the timer finishes, the flash is triggered.

The Tripwire Trigger in Action
The tripwire trigger with zero delay – Note the broken wire just left of the projectile

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Cheap Trigger for High-Speed Photography

H-alpha Imaging On The Cheap

This post is incomplete, but I hoped to begin sharing my tools and experience so others could hopefully benifit.

I’ve been stunned by some Hydrogen-Alpha (Ha) astrophotos.  Particularly when they’re combined with visible light photos (HaRGB and some other ways) the depth is stunning!

Unfortunately my astrophotography budget has been spent for the forseeable future.  This is my attempt to capture those photos using the following equipment:

  • Canon 1200D (T5) DSLR
  • 80mm Refractor Telescope and its infrastructure
  • Optolong 7nm Ha 2″ filter

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H-alpha Imaging On The Cheap

Automating GIMP

Let me be clear about something.  GIMP is probably my favourite piece of open-source software.  Truth told, I could have a license for Photoshop or PaintShopPro, and I would still use GIMP.  That’s because it is so focused on functionality over style – which means that, despite its limited development (it’s open-source after all), it is a program that has the horsepower to compete with the big players.  All you have to do is learn its quirky UI!

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Automating GIMP

Writing An ASCOM Local Server Driver

If you build an astronomy device and want to control it with some awesome PC software, then you need to write an ASCOM (AStronomy Common Object Model) driver.  There are great resources available for writing a single ASCOM driver for your DIY astronomy equipment.  Check out the video on the ASCOM website for a guide on writing a single-device driver!  But say, for instance, you have two devices (a Telescope and a Focuser) and would like to control them with one microcontroller.  Or say you want to control your telescope with Astrophotography Toolkit AND PHD2 at the same time.  Then you need to write a Driver Server!

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Writing An ASCOM Local Server Driver

Guided Telescope Mount & Accessories (Tracker V3) #DIY

Astrophotography is a bit of a money pit.  I recently delved into it with my 80-200 f/2.8L and a home-built tracking mount.  It was so much fun that I decided to buy a telescope!  So my entire budget went into an 80mm APO.

 

4e_filtered
First decent image from the 80mm APO – please forgive the dust spots!

The problem was that a telescope alone is useless for star pics – some quality infrastructure is needed.  This post is about my attempt to affordably build the following components:

  • High-precision Tracking Mount with an ASCOM-compliant driver
  • Guide camera and scope to help the tracking
  • Portable Power supply
  • Telescope Focusing motor with an ASCOM-compliant driver

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Guided Telescope Mount & Accessories (Tracker V3) #DIY

CNC Pancake Printer #DIY

Printing Pancakes With A Camera Dolly?

My kids are enthused by 3D printing, casually remarking about things they could ‘just print’.  Recently they asked to build a pancake printer – what a cool idea!

20181215_100232.jpg

I thought about how to build a simple batter extruder and gantry.  It didn’t take long to realize that IREnE, my new DIY camera dolly, is the perfect platform to use as a ‘theta-style‘ gantry!  So I set about adding pancake printing functionality to the camera dolly.

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CNC Pancake Printer #DIY