For this project, I created a Breathalyzer which draws colorful shapes as you exhale on it. The drawings vary depending on whether you had alcohol or smoked before.
I used an MQ2 gaz sensor, a pushbutton, an arduino and processing.
After saving a few of everyone’s breath drawings, I reassembled them in one file, which I printed on fabric to use as handkerchiefs.
I lasercut a box to put the sensor, adding a button that when pressed saves the screenshot.
Another hole on the side is used to pass the arduino serial cable.
The connexions to the MQ2 are as follow. My sensor had a four connexions: VCC (5V), GND, SIG (A0 pin) and NC. NC doesn’t need to be connected. The resistor used for the button is 10k Ohms.
After saving the images and recomposing them, the final result is printed on fabric (I used polyester).