1. ABSTRACT
The project is aimed to develop a device that can effectively detect cardiac arrest in a
human being. It consists of a pulse sensor mounted on a band which can be easily worn on the
wrist. The sensor is strapped tightly against the skin so that it detects the arterial swelling at the
pulse point. The strength of the pulses are continuously monitored and using a Bluetooth module
the voltage measured is continuously send to a microcontroller which is placed elsewhere on the
body of the person. The microcontroller is programmed so as to detect loss of pulses which arise
due to a medical condition known as cardiac arrest.
When there are no pulses detected by the wrist worn device, the microcontroller will
initially sound an alarm (buzzer) so as to make the neighboring people aware of the person’s
critical condition. If there are no pulses detected for more than 30 seconds then the
microcontroller sends text messages to three pre-saved mobile numbers with the help of a GSM
module and the emergency light on the device will remain glowing.
The Atmega32 microcontroller can be used for this purpose with the help of a
Bluetooth module and a GSM module. The device will help in reducing the time delay between a
sudden cardiac arrest and medical response. The patient if given the right medical treatment
within 4 or 6 minutes after the occurrence of a cardiac arrest then he or she can be brought back
to normal life.
The device can also help the loss of human lives in road accidents by reducing the
chance of being left unnoticed in the road. It can also be used to warn the user about heart
abnormalities other than a cardiac arrest if there is a large variation in the strength of pulse,
which may help in diagnosing heart diseases at an early stage itself. So the proposed device is
believed to improve the life expectancy of a person.