EKG monitor

In the beginning, I just wanted to make a simple device to monitor ma heart rate. As it often happens, I couldn’t resist developing the project, because the possibilities of the AD8232 were so promising… The final prototype can display, record and replay EKG signals. 4 slots are available to record EKG measures, up to a bit more than 4 minutes each. The recorded measures can be transferred to a computer, where they can be visualized and printed out. The format of the resulting page(s) is very minimalistic, but similar enough to the usual professional EKG strips to be understood by a specialist. Of course, my contraption is not a medical device. Nevertheless, it could be of some use…

Jan 15, 2025

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Components and supplies

1

EKG electrodes (succion)

2

4.7 kOhm resistor

1

Adafruit RTC DS3231 Real time clock

1

LED 5mm Yellow

1

Through Hole Resistor, 180 ohm

4

Microswitch, Miniature

1

screw terminal 2P 2.54mm

3

100nF Capacitor

1

Resistor 22K ohm

1

27 ohm resistor

1

Trimmer Potentiometer, 20 kohm

1

Ad8232

2

EEPROM AT 24C256

1

Arduino Uno Rev3

1

9V Battery Clip Connector

1

CR2032 battery

1

On –off switch

1

Dot Pcb

1

9v Battery

1

Piezo Buzzer

1

2 inch 240x320 LCD module (Waveshare)

Tools and machines

1

drill

1

Sandpaper

1

Multimeter

1

Solder (Generic)

1

Caliper

1

JigSaw

1

File (various)

1

Screwdrivers

Apps and platforms

1

Inkscape

1

Processing 4

1

FreeCAD

1

Arduino IDE 2.3.2

Project description

Code

EKG ino

cpp

Code for Arduino device

EKG monitor base

java

Code for PC app

Downloadable files

The handbook

How the device works

https://www.dropbox.com/scl/fi/z4hwhqscki1brxkj9na3a/EKG_monitor_handbook_10-5.odt?rlkey=ofd2vl0xyjx5ygev1w3hoh85a&st=f5kv3qxr&raw=1

stl files for 3D printed parts

Button: 2 versions, for different micro-switches

https://www.dropbox.com/scl/fo/4mghdric0qvm5fw9gjnq3/ABMjDoC_oBR8n1pDReBbA8U?rlkey=8k0vi2ftwf4yl251wake7of6n&st=4wsxxxzu&raw=1

Video Demo

How it works...

https://www.dropbox.com/scl/fi/7avp3hpm6m3eibf1gju3t/EKG_bm.avi?rlkey=jqzskef8mt7jbp1h86m2nih6o&st=hgmmrp57&raw=1

Schematics

NB: The 2inch display from Waveshare runs on 5V

EKGdiagram.png

Image

Inside...

The case is 3D printed.

openSpread2.jpg

Image

Front side of the pcb

Connectors are for the Arduino and the display

pcb_front_connections.jpg

Image

Back side of the pcb

The empty room on the left is for the battery

pcb_back_full.jpg

Image

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Blaise_M

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