DIY Heart Rate Monitor (logger)

In this project I will show you how a commercial smartwatch measures and monitors your heart rate and afterwards I will show you how to create a DIY circuit that can basically do the same with the addition that it can also store the heart rate data on a micro SD card. At the end I will then compare both heart rate monitors in order to find out whether my smartwatch still works fine. Let's get started!

Make sure to watch the video. It gives you all the information you need to create your own heart rate monitor.

Here you can find a parts list with example seller (affiliate links):

Aliexpress:

1x LiPo Battery: https://s.click.aliexpress.com/e/_d6jtyKS

1x Slide Switch: https://s.click.aliexpress.com/e/_dYGop3Y

1x MCP1700 3.3V Regulator: https://s.click.aliexpress.com/e/_d8ldQ90

1x Grove Heart Rate Sensor: -

1x OLED Display: https://s.click.aliexpress.com/e/_BffOD3gi

1x Arduino Pro Mini: https://s.click.aliexpress.com/e/_d62ALdV

1x Micro SD Card Board: https://s.click.aliexpress.com/e/_dVMMRTg

Ebay:

1x LiPo Battery: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x Slide Switch: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x MCP1700 3.3V Regulator: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x Grove Heart Rate Sensor: http://rover.ebay.com/rover/1/707-53477-19255-0/1?...

1x OLED Display: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x Arduino Pro Mini: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x Micro SD Card Board: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

Amazon.de:

1x LiPo Battery: https://amzn.to/3dCjupu

1x Slide Switch: https://amzn.to/3aCxgGw

1x MCP1700 3.3V Regulator: https://amzn.to/2xzbWDe

1x Grove Heart Rate Sensor: https://amzn.to/2QRhEqW

1x OLED Display: https://amzn.to/2JjPYHd

1x Arduino Pro Mini: https://amzn.to/2Jkzoqr

1x Micro SD Card Board: https://amzn.to/3apZHHK

Here you can find the schematic of the circuit along with the Arduino code and my .stl file for the housing.

You did it! You just created your own heart rate monitor!

Feel free to check out my YouTube channel for more awesome projects: http://www.youtube.com/user/greatscottlab

You can also follow me on Facebook and Twitter for news about upcoming projects and behind the scenes information:

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