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Thermal photography

14 Nov 21:15 65,415 views | Last edited by bsugar 13 days ago

Thermal Imaging: Heat Insulation in Older Building

by SCG | 3 days ago | 0 | 155 views | 1

Our second attempt was in a bedroom in an older apartment. We tested the apartment on November 24...

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thermal-photography thermal-flashlight thermal-camera tool

Thermal Flashlight Casing

by SCG | 3 days ago | 0 | 85 views | 0

Our group attempted to provide the best case for our thermal flashlight possible. We used a sewi...

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thermal-photography thermal-flashlight thermal-camera

Thermal Imaging: Heat Insulation Comparison

by SCG | 4 days ago | 0 | 206 views | 1

We hope to test the insulation in different apartment buildings among the Northeastern University...

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thermal-photography thermal-flashlight thermal-camera tool

thermal flashlight env+tech_neu_2014

by iferrerb | 10 days ago | 1 | 247 views | 3

Jordi Ariel Lotito, Isabella Ferrer, Emily Krebs What I want to do We wanted to see how we cou...

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Thermal flashlight - ENV+TECH_NEU_2014

by JuliaR | 10 days ago | 1 | 184 views | 1

What I want to do Using an Arduino kit, Julia (JuliaR), Becca (rgovoni) and Jacob (jacobmatz) fr...

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thermal-photography thermal-flashlight

Test of the Thermal Light: Env+Tech_NEU2014

by jens | 10 days ago | 0 | 145 views | 2

What I want to do Create a thermal flash light with a broad diffused light. My attempt and resu...

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Env+Tech_neu_2014 - Thermal Flashlight

by hklebs | 10 days ago | 0 | 139 views | 2

Hudson, Emil, and Taylor What we did We used an arduino thermal flashlight to map sources of di...

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South of France Forest monitoring

by DroneGo | 4 months ago | 3 | 692 views | 0

What I want to do Develop a tool with Drone (Quadcopter), InfraRed camera, in forestry theme My...

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More research on "thermal-camera" »

Title Last edited Edits Pageviews Likes
Thermal photography 13 days ago by bsugar 60 65,415 1
Scanning thermal camera 11 months ago by warren 3 12,900 0


Thermal imaging can be used to document heat/AC leaks from insulation gaps on a building's facade, reveal warmer ground water inflows (either fresh or chemical-laden) or "thermal pollution" from industrial processes entering ocean-temperature waterbodies, as well as identify areas on the human body experiencing infection or stress (includes epidemiological applications).

Community applications so far include both a "heat-busters" program in East Harlem and a "forensic" water quality monitoring program in the Gowanus Canal.


There are three prototypes in development:

  • A Thermal Flashlight (described on this page): a RGB LED flashlight with a non-contact infrared sensor that "paints" the temperature of the surface directly on the wall for capture with a second timelapse camera.
  • Thermal Fishing: dragging a thermometer through the water, taking contact measurements mapped to a RGB light, also for capture with a second timelapse camera.
  • A scanning thermal camera on a lego turntable (software also in development) that sweeps back and forth across a scene, recording the temperature variation to build up an image.


"FLIR" cameras can produce images such as the one below, and are typically used to identify heat leaks, but even low-resolution FLIR cameras can cost thousands of dollars. Our goal is to make this kind of investigation (and the potential savings) cheap, easy, fun, and informative for those of us without $10k in our pockets.

FLIR house

Thermal Flashlight

The first approach results in a kind of "light painting" -- a color heatmap overlaid directly onto the scene. This is the simplest, cheapest, and to date, most effective way we have developed of measuring heat leaks or cool leaks indoors and outdoors. Simply put, the "flashlight" puts out red light if it's pointed at something hot (default 75 deg F or more) and blue light if it's pointed at something cold *(default 60 deg F or less):

Using a Thermal Flashlight

To capture the light painting over time, we have been using timelapse photography or the prototype Public Lab Thermographer website (or its inspiration, GlowDoodle), as seen in the top image on this page.

  • Within view of the camera or laptop, sweep the flashlight beam over the scene at a distance of about 12 inches.
  • Try to stay out of the way of the beam, and don't point it directly at the camera or it will create a "starburst" and may mess up your image.
  • It's helpful to wear dark clothing so you don't show up in the image as you're moving around.

Thermal flashlight diagram

Building your own

Parts list For a Thermal Flashlight with 3.6 V Melexis Sensor and Common Anode LED.



_Note: The goal of this file is to be a place to download everything without pursuing other links. If there are changes or updates please feel free to add and re-upload. If the file is missing anything, please comment below. You might notice that this is for the 5v Melexis, but it will work for either without issues.

Alternative variations of the Flashlight can be made with a 5.5V Melexis Sensor and Common Cathode LED. For the 5.5 V sensor follow this diagram: For the common cathode circuit board follow this diagram:

Links to purchasing equipment:

Consumable Parts:

If you are starting an electronics kit from scratch:

  • a 40Watt soldering Iron (if you want it to be permanent otherwise duct tape or Velcro works temporarily)
  • hookup wire (solid not stranded- 22 or 24 gauge, you can get this at Radio Shack)
  • pliers called "wire strippers" to get the plastic wrap off the hookup wire (can get at Radio Shack)
  • solder for 40Watt iron, lead-free.
  • a breadboard (1 per flashlight). If you aren't soldering: If you are soldering:
  • a USB cable to connect the arduino to the computer via USB for power 5Volts (can get at Radio Shack)
  • household sponge for cleaning solder off tip
  • 9 volt battery with connector wires (can get at Radio Shack- 1 per flashlight)

Cost: ~$40-$60

These research notes will be integrated into this page to provide instructions on building and using your own thermal flashlight:

Several meetups have been organized to build and test thermal flashlights, at RISD (Providence, RI) and in Brooklyn, NY. We are organizing one now in Somerville, MA:

Thermal flashlight heatmaps

Tags: thermal-photography thermal-flashlight thermal-camera tabbed:notes tabbed:wikis tool