Arduino Lilypad Interactive Passion Sensing Scarf

Step 4 Infrared Emitter and Phototransistor

The IR Emitter is the one that is tinted in color, and the Phototransistor (detector) is the one with the clear package.

You will need to add some resistors to the emitter and detector. I used a 10Kohm resistor (brown, black, orange) on the detector and a 56ohm resistor (green, blue, black) for the emitter.

In order to hide the components since the emitter and detector will be on the front of the scarf, I used an iron-on patch. I curled the leads of each of the emitter and detector, then used an exacto knife and cut an "X" slit into each of the eyes. This allowed me to push the emitter and detector through the patch.

Hook-up: The emitter and detector each get hooked up from POWER to RESISTOR to LILYPAD PIN to IR LED to GROUND. Refer to the schematic on this step for better understanding. More information on pull up resistors by Make Online.

NOTE: Full schematic is at the end of this Instructable.

TIP: You wont be able to see the IR LED's light up. If you view them through your digital camera you will be able to. You will notice in my video that you can see the emitter is lighting up.