Device for blind people to know their pulse rate

Published Sep 25, 2020

GPL-3.0-only

1 hours to build

Intermediate

arduino

It is a simple Bluetooth device which measures the pulse rate and sends it to mobile application which speaks the value.

Components Used
Bluetooth Module HC-05 Bluetooth is a wireless communication protocol used to communicate over short distances. It is used for low power, low cost wireless data transmission applications over 2.4 – 2.485 GHz (unlicensed) frequency band.	X 1
Arduino mini Pro Arduino mini pro	X 1
Breadboard Breadboard	X 1
Connecting Wire Jumper Wires Connecting Wire Breadboard wires	X 1
AD8232 Heart rate monitor AD8232 is a single-lead heart rate monitor.	X 1
USB TO TTL Converter Interface Modules USB TO TTL 3.3V 1 PORT WITH DB9M	X 1

Description

Motivation

Once I was working with a pulse sensor and LCD display to display the pulse rate, at the same time I observed a blind man from the window of my room while he was crossing the road. So after observing that an idea came into my mind that it would be better if a device is there which would give an audio-based output in order to get the pulse rate. So I tried to interface the device with the mobile text to speech app via Bluetooth and it was working.

Working

In this arduino acts as the brain of the project which processes the data coming from the sensor and forwards it to the Bluetooth module which then transmits data to the android app which than converts the text to speech. The pulse sensor used works on the simple principal of Photoplethysmography which measure the rate of blood flow in specific volume.