Objective/Motivation

To create a blood pressure monitor that is portable yet accurate for users to use consistently. The monitors on the current market can be split up into two groups. The first group is the most common one used, which is the cuff on the arm. These are accurate, but are not portable and are uncomfortable to wear. The second group consists of monitors you wear on the wrist, and these are portable but inaccurate and inconsistent for the blood pressure readings. The goal of our project is to combine the best aspects of these two groups.

Design

Software

We implemented RTOS in our software and utilized 3 threads.

1. First thread reads the resistive sensor data.
2. Second thread interprets the resistive sensor data and turns the motor and valve on/off based on the data. It also converts the data into blood pressure readings.
3. Third thread prints the readings to the LCD screen.

Hardware

There are four major components in the device:

• Resistive sensor - detects how much pressure is being applied to the cuff.
• Motor - pumps air into the cuff.
• LCD screen - displays the blood pressure readings.
• mbed controller - integrates the software to the hardware.

Demo