HRM
Heart Rate Monitor Client and Server for Interactive Virtual Fitness
HRM was built for my mom, myself, and her trainer, Tim, to continue personal workouts during the pandemic. HRM provides a web client + server solution to see real-time heart rate data from anywhere with a bluetooth, supported browser, and internet connection. TODO: add more security
How does it work?
- Web bluetooth is an unstable, but really cool recent development that makes it easy to write websites that can send and receive bluetooth data. Standardized Bluetooth 4.0/Ant+ heart rate monitors are relatively cheap 25-60$ and you can start tracking realtime heartrate data with a supported chrome browser. Essentially, this software builds off of:
- Web bluetooth heart rate monitor demo
- websocket.io chat app. Instead of chatting with words, you're chatting with your heartrate data.
- Heart rate zones and colors use the simple max heart rate = 220-AGE and reports percentages of maximum heart rate.
- Tabata Interval fitness timer
- Awesome web server stuff (nginx, pm2, npm, jquery, bootstrap, letsencrypt, ....)
Running
npm install
npm start
#1- go to localhost:3000 to see aggregate heart rate data and use a tabata timer
#2- go to localhost:3000/hrm to log individual bluetooth heartrates
#3- go to localhost:3000/hrm_mock to send fake heartrate data
Starting tabata server and client
After runing npm start
, open browser to localhost:3000. Click the button to start logging a client heart rate. Open an additional browser to localhost:3000 to view the client heartrate data in realtime.
Starting tabata server and client
Test multiple clients using the mock client utility localhost:3000/hrm_mock or connect multiple bluetooth interfaces if you have them.
Using the tabata/fitness timer
Currently has a 5 second countdown and then will loop through work and rest periods indefinitely. Makes beeping noises.
For more detailed information:
- server bringup : how to host the server with a static ip and not just on local host
- client bringup : supported browsers and hardware information
- detailed running notes : heart rate mocking and client zones
Thanks
I would love to work with other people on improving this app. Ideally more personal trainers can continue providing guidance for improved fitness during the pandemic. I am releasing everything under an Apache 2.0 license.
Shout out to:
I tried a few different things before I got to this solution. Also, I have some more details here that I wrote on an exciting friday night during the pandemic: origins story.