--load the hex file onto Microbit
--click on the link
--run the code, edit, save to your hard drive...
Here's the Microbit file to load, use either one of these approaches:
(download and unzip)
This file will replace whatever you have loaded on your Microbit. Be sure you know how to restore the Microbit's default .hex file so you can return it to "normal" functioning. Then drag the .hex file to the Microbit's "drive icon", which will load this firmware.
Be sure to run in Chrome. Also, be sure to close the windows before you launch another link. If you have trouble, you may have to close Chrome and then reopen it before going to these links.
Video created by Michael Zitolo
This video explains how the pulse sensor device works.