These are Amazon affiliate links; a small part of your purchase goes to support me without any extra cost to you.
- CH340 driver (may be handled automatically for you, otherwise check documentation)
- Sparkfun MAX3010x Sensor Library
- Connect the OLED display and heart rate sensor to the Nano's A4, A5, 5V, and GND pins.
- Connect Nano to host, install drivers if necessary (Win10 will say USB-SERIAL CH340 instead of Arduino Nano, but it works all the same), install libraries, and upload a compiled version of
arduino-nano-bpm.ino - ???
- Profit
- Incoming information is a little noisy, but it's being managed by the
delta < 1000check. Ifdelta > 1000, the information associated with it doesn't look great, so it's thrown out (usually, this is a <60bpm).- Time to register finger touch slowed as a result
- Can appear as if not registering anything - just be patient.
- Included a quick graph over time example in case you need to modify alignment/direction/etc. in
circular-buffer-ex.ino. It's a quick implementation of the circular buffer/graphing code used inarduino-nano-bpm.ino, except with randomly generated data. You'll need to move this file before uploading, otherwise the Arduino IDE will complain aboutdisplaybeing redefined.
- Delta (time between heartbeats)
- BPM: current BPM through some math (taken from Sparkfun's examples)
- Average BPM: average BPM across 4 latest measurements (taken/modified from examples)
- Cute little chart showing BPM on Y axis and time on X. No labels on axes though, feel free to submit a pull request if you'd like :)
The sensor measures some quantities about the finger interacting with it through IR and a couple LEDs. It gives this information to the Nano, which measures time between certain quantities returned by the sensor to calculate heartbeat. This information is then formatted, added to the queue, and displayed on screen.