I hope this hasn’t already been mentioned but I would like to create a heart rate monitor that can be wrapped around the wrist. The amplification and filtering stage can be done on the flexi-circuit board and use a Piezo film sensor to detect the heart beat (e.g. SDT1-028K). Also a small 3 x 8 segment display to display the heart beat would be a bonus feature and maybe also be used to display the time.
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