Posted on by jcompas

Project Post #7

Wearable Circuits

John Compas

I’ve finished a lot of testing and will work on a few final designs tomorrow, along with getting some good pictures of my designs on somebody.

The “antennas” I’ve made power LEDs from a phone’s NFC coil pretty well. However, I have to “trick” the phone into thinking that there is an actual NFC tag near the coil otherwise the phone will not recognize it and will not fully power it.

I’m working on a quick little Android application to try to force the phone to not need to recognize a tag to turn on the NFC read/writer, but that might be more challenging than I thought it would be.

I’ve also finished with a battery-powered version of the circuit, to show that this configuration works with batteries too.

Materials List:

  1. Clear Covering Self-Adhesive 
    1. https://www.amazon.com/Magic-Cover-Adhesive-Contact-Projects/dp/B000BPF9QY/ref=sr_1_26?crid=QOW16D2H82TC&keywords=vinyl+adhesive+paper&qid=1551742619&s=gateway&sprefix=vinyl+ad%2Caps%2C195&sr=8-26
    2. Count: 1
    3. Cost: $5.50
  2. Silhouette Temporary Tattoo Paper
    1. https://www.amazon.com/Silhouette-MEDIA-TATTOO-Temporary-Tattoo-Paper/dp/B0043WJ3OA
    2. Count: 1
    3. Cost:  $8.99
  3. Spray Adhesive
    1. https://www.amazon.com/3M-General-Purpose-45-Adhesive/dp/B000PCWRMC
    2. Count: 1
    3. Cost: $5.77
  4. Speedball Gold Leaf
    1. https://www.amazon.com/Bememo-Imitation-Gilding-Crafting-Decoration/dp/B0722X91YR
    2. Count: 1
    3. Cost: $6.99
  5. SPMWH22286D5WAP0S2 (Samsung LEDs)
    1. Count: 100
  6. RC1210JR-07100RL (100 Ohm Resistor)
    1. Count: 100
  7. SL3S1203FTB0,115 (UHF RFID)
    1. Count: 10
  8. C1812C102KGRACAUTO (Capacitor)
    1. Count: 10
  9. NTR5105PT1G (Diode)
    1. Count: 10
  10.  Conductive Guitar Tape
  11.  NSR201MXT5G (RF Schottky Diode)
  12.  ST25DV16K-IER6T3 (NFC IC)
  13. RF700072 (NFC Antenna)
  14. RF700070 (NFC Antenna)