The coolest sensor I found with a lot of effort put in and as much open source as you can have was the http://pulsesensor.myshopify.com/pages/open-hardware - but with a price of 20 Euros it was to much for this project. Today I looked for arduino modules on ebay and this popped up http://www.ebay.de/itm/331290728104 - for 6 Euros - I could not resist!
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