jgschmidt created this display to show heartbeat information from a Polar chest strap device and shared the steps on Instructables:
Here is where I found ESP32 boards that can communicate to the Polar Bluetooth-enabled chest straps. Connect one of these to a large (relatively speaking) OLED display, and I could probably get what I want.
Add more electronics to your exercise regimen with help from the Adafruit Learning System:
- Exercise Buddy: Motion aware BLE media controller
- Raspberry Pi Pedal for Youtube
- Wearable Continuous Temperature Monitor with Adafruit IO
- Pyloton: CircuitPython Cycling Computer
- Bluetooth Cycling Speed & Cadence Sensor Display with Clue
- CircuitPython BLE Heart Rate Zone Trainer Display