But how to check heart beat with photo transistor and LED?
**broken link removed**
Introducing Easy Pulse: A DIY photoplethysmographic sensor for measuring heart rate
Good stuff, I'll have a look, thank you
Easy Pulse (Version 1.1) Sensor Overview (Part 1)
Easy Pulse (Version 1.1) Sensor Overview (Part 2)
In my photo album you can see my version of this device.
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Take ultra high bright red led, put it close to finger, and on other side you will see each heartbeat if you are live in that moment. :smile: