Temperature Sensor

Lego Mindstorms Compatible Temperature Sensor

(Click on any picture to enlarge)



Just for the sake of having it, neither I nor this site have any affiliation with Lego, Lego group, Lego systems or Lego MindStorms. Also, I am not responsible for any damage to your RCX and/or computer that may result from the use of the knowledge/designs stored on this WebSite.

After acquiring my MindStorm's robotic invention system (v1.0) I began performing tests on the brick to see if any the theories I had (for future sensors) were feasible. I quickly discovered the four basic modes. (Touch, light, rotation & temperature)

Now the temperature sensor port intrigued me so I began looking around to see what I could find that was compatible. I was at first looking for one of those electronic temperature sensors that you would have at your window with the sensor being outside. Then I came across the Radio Shack Thermistor (part number 271-110A) and discovered that this was almost exactly what I needed. My initial thought was to cut one of the wire leads and solder one end on to the temperature sensor somewhat like the light sensor is configured.

However, I find that limiting and wanted to see if I could do better. Then while looking through the Lego shop @ home catalog I noticed the most wonderful thing, electric plating (part number 5037)! Unfortunately you can't get 2 by 2 plate. 1 by 2, 2 by 4 or 2 by 8 is all they seem to make.

How to construct it

So I got the idea of cutting the 2 by 8 plate into four pieces thereby creating the 2 by 2 plate's that I required. (In the photo you can see that I used the two end pieces with the hacked ends to hold the sensor)

I then took the temperature sensor and bent it into the general shape that I wanted it to be. I then notched out part of the little circle on the bottom of the top plate and pressed the sensor into place. (As you can see in the photo) all that was left was to push the bottom plate onto the top plate and glue it into place. (As you can see the photo just before it was glued)

This design has the added bonus of being able to use a small or large wire (with about one degree C of signal loss with the large wire) as your choice. You can also use the top or the bottom to connect the sensor as both plates are active.

That's about it, if you have any questions you may contact me via email. Enjoy!

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