Temperature sensing Munny


Here’s another nerdy present that was built for Valentine’s Day. [João Silva] created a temperature sensing Munny. A Munny is a vinyl toy made to be customized. Other than these Munny speakers, we haven’t seen them in many electronics projects. The LM35CZ temperature sensor has an analog output that connects to the ADC on the ATtiny15L. The microcontroller changes the RGB LED’s color based on the temperature: blue for cold, green for comfortable, and red for hot. It only flashes every three minutes to conserve the power in the coin cells. His one-off circuit board also includes an ISP header for programming. The Munny’s head looks like it does a great job diffusing the light.


  1. sly says:

    from smurf to lgm (think toy story) in a few degrees

  2. João Silva says:

    I had to add a small blob made of transparent FIMO (polimer modeling clay) to mix the light correctly. The vinyl is not enough. The color output is kind of Fuzzy logic, with a linear change towards blue from 20 to 18 degrees and a linear change towards red form 20 to 22, full green is obtained at 20C.

  3. strider_mt2k says:

    Larry LED says, “diffuse twice for even more even light”

  4. jehan says:

    I LOVE IT!

  5. cynic says:

    I had no idea they made transparent FIMO, that’ll be a huge help for a similar project I’m working on.
    The more you know.

  6. This looks like my Munny Email alert…


  7. this is a great idea. looks like you are only a weekend away from having a disco ball head to make the john travolta munny. nice hack

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s


Get every new post delivered to your Inbox.

Join 96,705 other followers