1 / 8

Heart Rate Ring

Heart Rate Ring . Wei Dong Dec 16, 20 08. Objective. Known problems of existing products (relatively expensive, bulky, not open, etc.) To create a ring that can change its color according to heart rate (friendly user interface, less expensive, small package )

walt
Download Presentation

Heart Rate Ring

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Heart Rate Ring Wei Dong Dec 16, 2008

  2. Objective • Known problems of existing products (relatively expensive, bulky, not open, etc.) • To create a ring that can change its color according to heart rate(friendly user interface, less expensive, small package) • Opera of the Future (open hard/software, access to raw data, multi communication interfaces)

  3. System Architecture Hardware: heart rate sensor (LED-photodiode, op-amp, etc.), A/D and MCU (Arduino), I2C-Controlled RGB LED (BlinkM) Software: A/D conversion, BPM counter, LED driver

  4. Heart Rate Sensor • Principle • Circuit schematic

  5. Heart Rate Sensor (cont’d …) • Sensor outputs • Sensor demo

  6. Software (ATmega 168 firmware) • A/D conversion // Module description: measures output with the range of 0-5000mV, 10 bits convertor scale 2^10 // Functions called: analogRead(), Serial.print() • Heart Rate // Module description: // (1) averages the output over every 5 milli-seconds, // (2) triggered on rising-edge of signal, then measures amount of milli-seconds before next rising-edge, // (3) converts the measured heartbeat from milliseconds to beats-per-minute: 60000/beat-interval // Functions called: millis() • BlinkM LED driver // Module description: // (1) finds RGB/HSB (hue, saturation, brightness) in the look-up table according to heart rate // (2) sends color code via I2C // Functions called: BlinkM_funcs.h (ref.), Wire.send(), and I2C functions

  7. Lessons Learned • Easy to know but difficult to act (知易行难): tuning for multi-amp circuit, system integration, etc. • Chooses the one suitable for your application: starting from middle (中庸之道) • Adopt right materials and mechanical designs

  8. Future works • Chooses better ring design and material • Finalizes the circuit to ring package with SMD components

More Related