/Heartbeat-Tactic

This is an example of applying one of the availability tactics for fault detection which is heartbeat tactic. In this example the heartbeat tactic is being applied on pacemaker device.

Primary LanguagePython

Heartbeat-Tactic

Contents of This File

  • Description
  • Quality Attributes and More
  • Requirements and Installation
  • Setting Pacemaker Application
  • Maintenance

Description

This is an example of applying one of the availability tactics for fault detection which is heartbeat tactic. In this example the heartbeat tactic is being applied in pacemaker device.

Quality Attributes and More

Name: Pacemaker

Domain: Health Care

RQ1: The Pulse Generator shall be available 99% of the time.

RQ2 (satisfied): The Pulse Generator shall sense the lack of heartbeat and generate a counter pulse 99% of the time back to the heart (DAQ).

Environment: while the pacemaker listens to regular patient heartbeat.

Response: Detect and generate messages to determine if the heart stopped for a minimum of time (0.5 milliseconds), generate an artificial pulse (stimulus) to the heart (DAQ).

Response measure: Failure detected within a time interval of 0.5 milliseconds and the pacemaker generates artificial pulse and continues to listen to regular “heart” pulses.

Requirements and Installation

Setting Pacemaker Application

  1. Copy the application folder named heartbeat_project in your Desktop.

  2. Open the command prompt.

  3. Enter the heartbeat_project/

  4. Type the command ‘python pacemaker.py’ without quotes and press enter.

  5. The output should be like this:
    …
    DAQ:pulse_simulator: *** New pulse generated! *** 2
    DAQ:pulse_simulator: *** New pulse generated! *** 1
    DAQ:pulse_simulator: *** New pulse generated! *** -1
    *** PulseGenerator:check_heart_signal Absent/Weak heartbeat ***
    DAQ:get_generated_pulse: *** New pulse received! *** 3
    DAQ:pulse_simulator: *** New pulse generated! *** 10
    DAQ:pulse_simulator: *** New pulse generated! *** 6
    …

In the example above, DAQ represents the source of the “message”. The line that starts with the 3 stars (***) has a source named PulseGenerator. To simulate the “normal” function of a heart random numbers (range -1-10) are generated. Values 0-10 represents the normal functionality of the heart, and -1 represents either a weak or an absent heartbeat. When -1 is received by the Pulse Generator, an artificially generated heartbeat is generated (0-10) and injected into the heart or in this case the DAQ.

Maintenance

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