Weather Wand

A tool to make the invisible visible, to paint with temperature.

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The wondrous magical weather wand casts an enchanting spell of light. A way to see what is normally felt.

In less magical terms, I have an Arduino pro mini with a temperature sensor (currently a TMP36) and a RGB LED. The Arduino checks temperatures and sets the color of the light based on the temperature.

The early version of this used a temp to color table (like the temperature map project) that would for example set to the light yellow if above 70º or to blue if below 30º. However it would be pretty unlikely to encounter that wide of a temperature range within a space so instead of re-tuning the table for every location I wanted to have it set it's own range.

The wand takes and averages the temperatures it sees and sets the color to normal (green) based on that average. The color changes basedon the number of standard deviations from that average. ie: 2+ stddev is red

Also got it to work with NeoPixels, because one light might just not be enough sometimes.

  • 1 × Arduino Pro Mini
  • 1 × TMP36 sensor
  • 1 × RGB LED
  • 2 × 100 ohm resistor Blue and Green channel
  • 1 × 150 ohm resistor Red channel

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  • 1
    Step 1

    Weather Wand with RGB LED

    Weather wand with NeoPixels

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Dan wrote 03/29/2015 at 19:57 point

I will give it a shot, anything that speeds up the response rate and resolution is going to help and that thing has crazy good resolution. I have a MCP9808 from adafruit I have been playing with but the tmp112 might be even better. Thanks!

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RoGeorge wrote 03/29/2015 at 18:30 point

Nice and useful application, congrats!
You may want to try a TMP112 as a temperature sensor, you'll be amazed by its sensitivity.

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