Introduction: Yoga Breathalyzer
This project was created at the Silicon Chef Women's Hardware Hackathon by:
Step 1: Collect Supplies
For this project, you will need:
Soldering equipment, break-away header pins, and wire (rainbow cable works great)
Anemometer (wind sensor) such as this one: http://moderndevice.com/product/wind-sensor/
2 meters WS2812 LED strip, such as this one: http://www.adafruit.com/products/1138
Plastic cup and a single white sock (great use for that lonely sock that lost its partner)
9V DC barrel jack power source
A cup or bowl to cover the sensor so there's no wind during calibration
Step 2: Solder Wires to the Wind Sensor and LED Strip
For the wind sensor, solder wires to the Gnd, +5V, Out, and Tmp contacts. We won't be using the RV contact for this project, so it doesn't matter whether you solder a wire to it. These wires should be at least 5 feet long, since they'll need to stretch from the headset to the Arduino.
For the LED strip, solder wires to the three contacts (Gnd, +5V, and DIN). Note that these strips are directional -- they have a right end and a wrong end to solder the data line to, although you could supply power to either end if you wanted to. So be sure to solder wires to the DIN (data in) and not the DO (data out) side.
At the opposite end of each wire, solder a breakaway header pin, so that the wires can be inserted into the Arduino. There should be a total of 7 wires, 4 from the wind sensor and 3 from the LED strip.
Step 3: Mount the Sensor to the Headset
Use zipties to secure the wind sensor onto the headset, attaching the wires up to the earpiece.
Step 4: Mount the LED Strip Onto the Cup
Wrap the LED strip around a plastic cup and use clear packing tape to secure it in place. Cover the cup with a white sock; cut to size if necessary. This will diffuse the light from the LEDs.
Step 5: Load Code
Download the code from https://github.com/biobonnie/YogaBreathalyzer
Also download and install the LED strip library from http://code.google.com/p/fastspi/
Connect the Arduino to your computer with a USB A-to-B cable and load the sketch.
Step 6: Connect It All to the Arduino
- Gnd to Arduino Gnd
- +5V to Arduino 5V
- Out to Arduino analog port A0
- Tmp to Arduino analog port A2
- Gnd to Arduino Gnd
- +5V to Arduino 3.3V
- DIN to Arduino digital pin 6
- connect the barrel jack to the Arduino and plug the power source into the wall.
Step 7: Calibrate the Sensor and Get in Touch With Your Breath
When the Arduino sketch first starts up, it will take 10 seconds to calibrate the wind and temperature readings. To make sure the air is completely still during calibration, invert a cup or bowl over the wind sensor and press the Reset button on the Arduino. The LED strip will light up for 10 seconds while the sensor stabilizes, and the sensor will take a calibration reading. When the lights go out on the LED strip, calibration is done and you can remove the cup/bowl from the sensor.
Put on the headset and position the wind sensor close to your nose and mouth. Sit comfortably and experiment with different styles of breathing. Observe how the lights change -- the lights will fill the strip according to the wind speed, with the color controlled by the temperature of your breath.