The push towards personalized health information has resulted in an increased demand for real-time health data. Sensor miniaturization has allowed for physiological data to be collected easily with minimal discomfort. Such data can be collected easily via low-power wireless protocols and transferred through common means to any point on Earth via the Internet.

Exercise equipment commonly found in workout gyms throughout the country are improving in their intelligence and ability to monitor and record data. A loose standard called CSAFE has emerged from the exercise equipment manufacturing industry which allows for serial asynchronous communication, audio transmission, and limited powering of external devices.

The fitness monitor is a small form-factor device that can couple to gym machinery as well as body-worn sensors such as a heart rate monitor. Unique to a particular user, this module collects data during a user’s workout session in a gym setting, and uploads the data to client’s servers for the user to access at any time.

A special power handling case was encountered for self-powered exercise equipment, where power is required to recognize and start an exercise session, yet no power is available from the CSAFE port. A backup power source was devised to provide supplemental power (during Wifi transmissions) and to enable safe self-shutdown and start-up to conserve power.