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By Martin Fitzpatrick @ martinfitzpatrick.name show us how to build the micro display heart-rate monitor.
Pulse sensors have become popular due to their use in health-monitors like the Fitbit. The sensors used are cheap, simple and pretty reliable at getting a reasonable indication of heart rate in daily use. They work by sensing the change in light absorption or reflection by blood as it pulses through your arteries — a technique jauntily named photoplethysmography (PPG). The rising and falling light signal can be used to identify the pulse, and subsequently calculate heart rate.
Heart-rate monitor on a small OLED display with MicroPython – [Link]
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