I am kicking around an idea for a cell phone based water sample spectrometer

It would be used for testing the water in my aquaponics system. I am not sure that the stuff I want to test is even detectable with the hardware I am going to use, but working out the mechanics is what’s challenging for me at the moment. The genisis for this idea is at http://www.backyardaquaponics.com/forum/viewtopic.php?f=50&t=11840&start=150#p345100

The process is to use the LED flash of a smartphone camera, a bit of a CDr or DVDr as a diffraction gradient, the camera, and the processing power on the phone. You measure distilled water, and then the sample and compare the two to see the differences.

The drawings are a quick render of the OpenScad file. The half-circle is a pivot that will hold the diffraction gradient so I can play with angles. I also need to add a spot for the test tube somewhere along the thin light slot.

The whole thing will be parametric, and customizable to any given smart phone.

Well, this is the plan. I am going to sleep on it a night, see what I dream up on it, and maybe send it to my printer tomorrow.

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An item of mine was featured on ThingiVerse today.http://www.thingiverse.com/thi…

An item of mine was featured on ThingiVerse today.http://www.thingiverse.com/thing:29107

Of course, my luck, it’s a photo of my toilet!

This is somehow fitting for me…

And what’s the best punny joke that can be made of this?

Toilet Seat bolt bushing/shim by creuzerm – Thingiverse
Thingiverse is a universe of things. Download our files and build them with your lasercutter, 3D printer, or CNC.

It looks like operation z-wobble removal is a success! I printed out a tall, thin…

It looks like operation z-wobble removal is a success! I printed out a tall, thin print with what’s left of my white to test the fix. http://www.thingiverse.com/thing:28690

As you can see, it’s MUCH better than it used to be. I had some issues that I think are thermal in nature as there are a few layers that didn’t bond well.

I blame http://www.thingiverse.com/thing:20147 for the dramatic improvement on my printer.

In album


Printing a cell phone battery holder I designed as a test print.


Looks pretty good.


I have some very fine lines, but they appear to be layer lines and not z wobble lines.


There was a week layer. Not sure if the printer z-lifted and didn’t settle back down or if I had a cool layer and it didn’t bond well.


Annoying how I can only do 4 photos at a time.

Step 1) buy the cheapest fan in the store

Step 2) go to another store. Find fan you like much better. Buy that one.
Step 3) hang fan most of the way.
Step 4) dig up set of 50 inch replacement blades a friend gave me years ago.
Step 5) mod blades to fit 42 inch fan brackets
Step 6) finish hanging fan
Step 7) take nap under new, larger fan
Step 8) social medias
Step 9) return first fan
Step 10) profit???

In album


Drilling out new holes to mount these longer blades onto the fan brackets.


The blades that came with the fan on the left, my replacement blades on the right.


I am a big fan of my new fan.