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Lego Spectrometer

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This is the latest version of Public Lab's DIY Desktop Spectrometry Kit -- the Lego Spectrometer. It addresses issues of rigidity, sourcing, modularity, and image quality over previous versions.

We've been making and distributing Do-It-Yourself spectrometers since 2011, and have been through 4 major kit versions and hundreds of different community contributed modifications, new versions, changes, and more.

Get a kit

This is an open source kit, so you can just build your own -- but to order parts for a kit, visit the Public Lab Store:

Design goals

Over the years, we've identified a few really critical improvements that have been tough to solve:

  • rigidity
  • easy to source parts
  • modularity - working together
  • image quality

Our mission is to make it easier, cheaper, and more accessible to do environmental monitoring, and to do that as an open source, collaborative community. And of course part of that is cost -- while people build upon our kits with more expensive options and upgrades, we want the basic kit to be extremely affordable.

Quick start

Questions

Title Author Updated Likes Comments
Spectral Workbench so slow on raspberry pi zero @danieisnietgek about 2 months ago 3
Spectral Workbench @danieisnietgek about 2 months ago 0
Which No IR 12mm lens should I get for 640x480 webcam? @jevs 2 months ago 3
Removing IR filter from basic webcam? @jevs 3 months ago 15
Possibilities to use the dvd in reflection in the spectrometer ? @vnourrit 4 months ago 1
Can't access pi camera in Spectral Workbench @lukemcpheters 7 months ago 4
What size cuvettes are used for the lego spectrometer? @joquendo 9 months ago 6
What could be some applications of a hand-powered paper centrifuge? @mimiss 10 months ago 9
Lego Spectrometer cardboard cut out template? @aga about 1 year ago 3
Does the image quality of the raspberry camera higher than the webcam? @Builder6274 over 1 year ago 0
Does the image quality of the raspberry camera higher than the webcam? @Builder6274 over 1 year ago 5
Raspberry pi operating system for Lego spectrometer @Aleksi12358 over 1 year ago 6
Do a DVD is provided with the LEGO kit ? ty ! @adamsanta almost 2 years ago 1
Can I use the lego spectrometer to measure enviromental light spectrum? @baxamook almost 2 years ago 2
Uploading images from raspberry pi. @cedarlodge almost 2 years ago 12
Lego Spectrometer suitable for studying sunlight? @jsbonillam almost 2 years ago 12
Do I need to use a DVD-R? Will a CD-R work too? @jordankc about 2 years ago 2
normal or noIR camera? @iamben about 2 years ago 3
Quantifying Phytonutrients using a Spectrometer, Possible? @zayas about 2 years ago 7
How do I... @Sahil about 2 years ago 1
I want to know a method to quantify milk proteins using the foldable mini spectrometer, Is this possible? @julsmill about 2 years ago 3
Can a DIY spectrometer be used to measure water turbidity? @warren about 2 years ago 8
How do I trigger a photo on a Raspberry Pi camera using a button? @warren about 2 years ago 2
How can we set up a Raspberry Pi camera as an ethernet USB device to avoid using WiFi @warren about 2 years ago 5
How can we stream video to SpectralWorkbench.org or Infragram.org from a Raspberry Pi camera? @warren about 2 years ago 2
What's an easy way to compare two liquid samples with a spectrometer? @warren over 2 years ago 8
Can I upgrade a DIY spectrometer with a Raspberry Pi camera? @warren over 3 years ago 10
Getting the spectrometer to work with a Raspberry Pi? @anjohn12 almost 4 years ago 6
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Building your Lego Spectrometer

Add an activity  or request an activity guide you don't see listed

Activities should include a materials list, costs and a step-by-step guide to construction with photos. Learn what makes a good activity here.

Spectrometry activities

Purpose Category Status Author Time Difficulty Replications
Detecting Pesticides in Organic and Conventional Raspberries using Open Source Instrumentation - - @silverhammer - hard 0 replications: Try it »
Using the Spectroscope for Analysis of Concentration (Beer's Law) test-limits - @straylight 3h medium 0 replications: Try it »
First "PIG Oil Only Absorbent Mat Pad" Test - - @Matej - - 0 replications: Try it »
Separating Oil from Water by Freezing the Water - - @Matej - - 0 replications: Try it »
Preliminary LED and isopropyl alcohol solvent tests for oil fluorescence analysis - - @warren - - 0 replications: Try it »
Testing the Oil Testing Kit: identifying a "somewhat unknown" sample - - @warren - - 0 replications: Try it »
Oil Testing Beta --plus Grand Isle tar - - @eustatic - - 0 replications: Try it »
Spectrometry Sample Extraction at the Parts & Crafts Toolshed-Raising - - @warren - - 0 replications: Try it »
Spectrometer 3.0 add-on v2 - - @programmer1200 - - 0 replications: Try it »
Mobile cuvette holder - - @cfastie - - 0 replications: Try it »
Testing high-brightness 405nm LEDs in fluorescence spectroscopy of oils - - @warren - - 0 replications: Try it »
Honlian 60s LED nail polish hardener, various LED fluorescence updates - - @warren - - 0 replications: Try it »
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Add an activity  or request an activity guide you don't see listed

Activities should include a materials list, costs and a step-by-step guide to construction with photos. Learn what makes a good activity here.


Spectrometer calibration

Add an activity  or request an activity guide you don't see listed

Activities should include a materials list, costs and a step-by-step guide to construction with photos. Learn what makes a good activity here.


tinkercad.png

Tinkercad model, below

Parts

3D models

  • Tinkercad: https://tinkercad.com/things/43IqCTHE7Iz
  • Thingiverse: https://www.thingiverse.com/thing:2711528

3D brick models

Lots of great brick models are available here: https://printabrick.org/ and on http://thingiverse.com

  • assorted standard bricks: https://www.thingiverse.com/thing:2626413
  • holey bricks: https://www.thingiverse.com/thing:1095326
  • sloped brick: https://www.thingiverse.com/thing:527185
  • corner L brick: https://printabrick.org/bricks/2357
  • brick w/ peg: https://printabrick.org/bricks/2458 (I used this instead of a 1x2 hole brick + a friction peg, because I couldn't find a model for the brick)

Brick dimensions are nicely described in this diagram from Wikipedia:

https://commons.wikimedia.org/wiki/File:Lego_dimensions.svg