Pulse Necklace 02Aug2009

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Sensebridge Meeting Notes about Pulse Choker

Research Links

12 lead ECG fabric electrode belt system patent

Wearable ECG Monitoring System Using Conductive Fabrics and Active Electrodes

Preliminary study of dry knitted fabric electrodes for physiological monitoring

IEEE sensing fabric paper

FDA clearance on Textronic fabric ECG electrodes

Eric has filled out the "purchase" form on Textronics fabric electrode kit, and will follow up with them in order to get the kit. Rachel, Chung-Hay and Eric will split the cost.

Optical Pulse Circuit Experimentation

We soldered leads unto the emitter/transmitter device, and held it against various body parts:

  • Neck: no flashing, despite many attempts on both of us
  • Wrist: Eric got it to work once on his wrist, but generally this fails
  • earlobe: Eric got it to work a few times, this was actually the most promising area after thumb
  • Thumb/finger: the original, still very flaky, works maybe 25% of the time

Prototype Armature/Display

We prototyped a choker today. We cut a "T" circuit silk screen mask out of a cool piece of flexible plastic, and then painted the silver conductive paint unto the mesh fabric. Then we soldered multi-color cycling LEDs unto the traces, and wires unto the dongle end (note: don't use unnecessary headers, they are hard to solder to with solid wire), and stuck them into an arduino, pins D6 & D8, with 500 ohm resistor on each line.


int LeftNeckLED = 6;
int RightNeckLED  = 8;

void setup() {
  pinMode(LeftNeckLED, OUTPUT);  
  pinMode(RightNeckLED, OUTPUT);
   digitalWrite(LeftNeckLED, 1);
   digitalWrite(RightNeckLED, 1);

void loop() {
   digitalWrite(LeftNeckLED, 1);
   digitalWrite(RightNeckLED, 1);
   digitalWrite(LeftNeckLED, 0);
   digitalWrite(RightNeckLED, 0);


Choker Proto.jpg

Chung-Hay Proto.jpg

Eric Proto.jpg

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