Public Lab Research note

Circuit Diagrams for 5V Melexis Sensor

by sara | February 07, 2012 17:15 | 165 views | 7 comments | #762 | 165 views | 7 comments | #762 07 Feb 17:15

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On the 4th of February, Public Lab and RISD's Digital+Media Department hosted a Thermal Flashlight Workshop. The workshop went great! All of the students managed to make a Thermal Flashlight in 3 hours, many of them had little to no electronics experience. This is particularly exciting as during the workshop we realized we had ordered 5 Volt Melexis sensors rather than 3 Volt sensor we had developed the circuit board. Thankfully, Jeff, Shannon and I were able to figure out a fix on the run. Attached is a circuit diagram for the Thermal Flashlight if you use a 5 Volt sensor rather than a 3 Volt sensor.

Parts list For a Thermal Flashlight with 5.5 V Melexis Sensor and Common Cathode LED.

Files Size Uploaded 23.7 KB 2012-05-26 03:01:36 +0000 24.2 KB 2012-05-26 03:01:51 +0000


This diagram has one small mistake-- the power to the LED is not actually hooked up. Move it across the board divider so it is connected to the LED power pin.

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Should look like this, will post drawing later

Corrected 5.5v thermal flashlight circuit

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Do you have the code to enter into the Arduino card? I could not find a link to it. (thanks!)

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Hey Y'all,

I fixed the picture! Thanks for noticing the problem.


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Also I should note that Leif, has designed a circuit board where both the LED and sensor use 5 volts-I'm going to ask him to put together that circuit diagram.

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Is there an advantage to using the 5V sensor as opposed to the 3v?

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It's really a cool and helpful piece of info. I am glad that you just shared this helpful info with us. Please stay us up to date like this. Thank you for sharing.

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