Sketching with Hardware 1/5: AmbiLEON

In March, we celebrated the 5th anniversary of our workshop „Sketching with Hardware“. In 7 days, 12 students learnt to use electronic components, to create new creative user interactions and realized their own physical computing projects. The overarching topic for this course was  „Bionics“. Again, at the final presentation the crowd had the chance to experience five extraordinary experience prototypes. During the following days, all projects will be presented on this blog. Today: Part 1, the AmbiLEON!

by Frederick Himperlich und Tanja Neumeyer

{lastname}@cip.ifi.lmu.de

What is it?

When you look at the chameleon in the picture, you see an animal climbing a tree having a green body and a red head.
Chamaeleon
If it’s trying to hide itself, it definitely failed!

During our research in bionics we learned about chameleons that they use their ability to change color not only for hiding but as a reaction to their surroundings. We were ecstatic about this fact and wanted to use this in our project.

Group Ambileon 1

Changing colors is the essential thing about our AmbiLEON-Prototype. Our idea was to develop a kind of lamp which creates ambient light in not static or random colors but in colors which express certain states or happenings.

How does it work?

When we began to build AmbiLEON, we knew the most important things were the RGB-LED-lights.

To create a random color with a RGB-LED you need 1 digital output for every color so three outputs for one LED-Strip. Since we wanted to use many LED lights, more than the ArduinoUNO could handle, we decided to use the Arduino Mega with a total of 14 PWM digital outputs Since the LED-Strips need a 12 V power supply we used transistors to control the 12V LEDs with the 5V digital output.

Now the base was given to let AmbiLEON change its color. The most important ability of our prototype was camouflage. To make that possible we needed the Ambileon to “see” its surroundings. For that we added a Camera to the Ambileon and wrote a little C# app that did the capturing. The captured camera pictures are separated in four columns (one column for each LED-strip), for each coloumn the average color is calculated and send back over serial port to the ArduinoMEGA which changes each LED-strip’s color accordingly.

The Ambileon
Image 1: Camouflage mode

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