PEPPY Milestone 1Kent W. NixonCS 2610November 18, 2015
Project GoalsCan 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 instantNot
aware of how quickly heartrate can change
Challenge 1 HardwareTime delays involved with LED/camera will
limit how quickly it can turn on and offChallenge 1
HardwareSurprisingly, the off-to-on transition takes longer for
both the camera and LED lightChallenge 1
HardwareCameraLEDOn->Off0.188 Seconds0.234
SecondsOff->On0.039 Seconds0.113 SecondsChallenge 2 HumanFor
accurate PPG with smartphone, user has to remain stillMeans
heartrate likely will not change quicklyCan use current heartrate
to predict next measured heartrate
Red dot means LED on, blue means LED offWork to CompletePolish
the peak detection algorithmCheck and verify camera/LED delays
across different devicesCollect sample dataNeed to use dedicated
device for baseline
