A wearable device includes one or more sensors of information from a subject. The wearable device may have an electronic assembly supported by a base. The electronic assembly may include a sensor data collection system configured to control collection of sensor data related to one or more characteristics of a subject and one or more processors. the sensor data collection system may include a controller configured to control sequencing and scheduling of the sensor data collection, and a buffer configured to receive and buffer data corresponding to the sensor data collected from the one or more sensors in accordance with a signal provided by the controller. The one or more processors may be configured to receive the buffered data from the buffer in accordance with a wake signal； process the received data； and output the processed data. Scheduling and sequencing the sensor data collection by the sensor data collection system may be decoupled from the processor such that the processor may be in a low-power sleep mode during data collection and in a normal power mode to process data received from the buffer.
