Phoenix Ambulatory Blood Pressure Monitor Project
Sub-project: Body Motion Sensor

 

Project Description

The purpose of the project is to build a reliable, low power, low cost body motion sensor using MEMs. The sensor will be used in conjunction with any ambulatory blood pressure monitor (ABPM) and would correlate the general activity level of the human body with the blood pressure measurements.

The project is broken up into two stages. The first stage is to use an existing STAR (Sensing Triple Axis Reference) Board manufactured by Freescale Semiconductor, Inc. http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=RD3112MMA7260Q&nodeId=011269Vhn6&tid=tsft#
The STAR is a stand-alone battery powered demonstration module from Freescale MMA7260Q ±1.5 g Triple Axis MEMs Accelerometer that also contains a MC68HC908KX8 8-bit microprocessor along with 16K X 8 memory to store data. The unit will produce time-sampled values of acceleration and load them into memory for later analysis. This unit will be used in conjunction with the current ABPM to determine:

• The most optimum sampling rate.
• The potential required motion computational issues.
• What body movements would produce the most significant impact to the ABPM measurements.

The second stage would take this information to more clearly define the requirements for the motion sensor that would integrate into the Phoenix ABPM.

Project Deliverables

• Results of preliminary evaluation and report.
• Design of sensing circuit, including filtering and processing stages.
• Layout and fabrication of a prototype circuit board.
• Evaluation of completed sensor system.
• A written report.
  

 

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