PEPPY Milestone 1 Kent W. Nixon CS 2610 November 18, 2015

Project Goals  Can power consumption can be reduced during pulse measurement using the rear-facing camera and light of a mobile device without a significant reduction in accuracy?  Challenges:  No model yet available for power consumption during heartrate monitoring and enabling and disabling camera/LED is not instant  Not aware of how quickly heartrate can change

Challenge 1 Hardware  Time delays involved with LED/camera will limit how quickly it can turn on and off

Challenge 1 Hardware  Surprisingly, the off-to-on transition takes longer for both the camera and LED light

Challenge 1 Hardware CameraLED On->Off0.188 Seconds0.234 Seconds Off->On0.039 Seconds0.113 Seconds

Challenge 2 Human  For accurate PPG with smartphone, user has to remain still  Means heartrate likely will not change quickly  Can use current heartrate to predict next measured heartrate

 Red dot means LED on, blue means LED off

Work to Complete  Polish the peak detection algorithm  Check and verify camera/LED delays across different devices  Collect sample data  Need to use dedicated device for baseline