Stanford Wockets Activity Project (SWAP)

Stanford Wockets Activity Project (SWAP)

Wocket Monitoring System Equipment 

Monitoring system consist of a smart mobile phone (HTC Touch Diamond2), 4 motion sensors (Wockets), 4 bands for holding a Wocket on the dominant wrist and ankle, two pocket pouches for carrying a Wocket in a pants pocket besides two chargers, one for charging the phone and other for charging the Wockets.

HTC Touch Diamond2

The phone is a touch screen “smart” mobile phone that has a variety of usual “smart” phone functions which include

HTC phone home screen

The phone you will be provided (project phone) will have custom software that allows it to receive information from the two activity sensors (Wockets)  you will wear or carry, store these data on the phone and automatically send (upload) these data to a secure server (some during the day but most of it at night).


The Wocket physical activity monitoring system consists of two custom-designed wireless motion sensors/transmitters (Wockets) and a mobile phone.

For more technical information about the Wockets click here.

Data Collection

The mobile phone is able to receive these signals, store them in memory, and perform limited processing.  Using the data connection on the phone, small amounts of the motion sensor data (summary data which is raw accelerometry data averaged for a minute) are sent automatically each hour via wireless to a project secure server for monitoring and problem detection by project staff.

The chart below shows summary data recorded from 10:30 AM to 3:30 PM while the subject was alpine skiing at a ski resort. It is easy to see the motion while skiing and the resting in between while on the chair lift. Lunch was eaten between 1:15 and 1:45pm.

Each night, when the phone is being charged, it will automatically send the raw accelerometry data collected from your Wockets that day to the secure server using the phone’s wireless connection. This raw data allows for much more detailed analysis of your activity or inactivity throughout the day.

The figure below shows the movement of an MIT scientist as he moves about the day walking, riding the subway, sitting at meetings or dinner, around home in the evening and then while sleeping.

Footer Links: