Transmissometry Extended

Note: This project was originally hosted at, but I realized that a fragrance website isn’t really the best place for heavy duty science info, so I moved the transmissometry discussion, source code, and schematics here.

Below is the original post:

Open source hardware saved Campfire #1

I know there are case studies of Open Source Software helping businesses with their day-to-day tasks, but how many case studies are there of Open Source Hardware helping a business solve problems?

Here is my example of how the Open Source Hardware community saved the launch of my company’s first product.

I’ve also included all the theory, technical schematics, and details towards the end.

Here is the video we did for Pumping Station: One and Element 14:

Transmissometer from Pumping Station: One on Vimeo.

How did I get here:

My idea for a campfire scented cologne won the business plan competition at barcamp Chicago 2010, and on May 10, 2011, nearly a year later, I’m ready to launch my product-RuggedScents’ Campfire. Unfortunately, less than four weeks to launch, I discovered a major process flaw: gigantic inconsistencies between the longevity of the fragrance’s smell on the user’s skin from batch to batch-some batches lasted three to four hours, some barely made it past 30 minutes!

<pictures, schematics, and video after the jump> Read the rest of this entry »


Transmissometry: lasers and concentration

I’m starting up a company that makes a campfire scented cologne (I’m actually producing the smoke part of the fragrance myself).  I recently ran into a problem that only open source hardware could solve: figuring out concentration using just how much light my samples absorb.

Here is a blog post with details, schematics, photos, and source code.

Here is a video we shot (with the support of Element 14) to show how the device works:

Transmissometer from Pumping Station: One on Vimeo.


Crowdsourced Chemistry to Solve Important Problems

I’ve spent a little time thinking about how the lessons of the open source software movement can influence and assist chemical research, but Dr. Matthew Todd is not only cleverer than me, but has spent much more time on the problem – here is what he came up with (presented earlier this month at a Google Tech Talk).

Here are links to a few of the projects he mentions in the talk: