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hr10-monitor

Arduino sketch to monitor the Polar® HR10 heart rate sensor with an Arduino MKR WiFi 1010 board on an Arduino MKR RGB LED matrix shield of size 12x7 LEDs.

Ardurino MKR WiFi 1010 with MKR RGB shield

This is a multi source file Arduino sketch. It allows to decouple not related functions into separate files and thus re-using the code in other projects as well.

The monitoring code in polar_hr10_monitor.cpp implements a finite-state machine (FSM) pattern. This allows a precisely defined behaviour based on distinct states. The code becomes robust while staying clearly arranged while doing multiple tasks like communicating with the sensor and blinking concurrently.

Display

The matrix display shows the heart rate in beats per minute (bpm) as small 3x5 numbers (N) and as a bar graph (G). Numbers and bars are coloured according to the bpm ranges defined in color_ranges.cpp. Within the bar a single white dot shows the rate within the given bpm rate to estimate when to leave the range.

The (P) LED in the upper left corner pulses in the speed of the received heart rate.

   1  2  3  4  5  6  7  8  9  10 11 12
1  P  .  .  N  .  N  N  N  .  N  N  N
2  .  .  .  N  .  N  .  N  .  N  .  N
3  .  .  .  N  .  N  N  N  .  N  N  N
4  .  .  .  N  .  N  .  N  .  N  .  N
5  .  .  .  N  .  N  N  N  .  N  N  N
6  .  .  .  .  .  .  .  .  .  .  .  .
7  .  G  G  G  G  G  G  G  G  G  G  G

References