Youtube user [npaltmp] hacked up a alphanumeric LCD from a defective answering machine, an ear clip pulse sensor from a stationary exercise bike and interfaced it with an Arduino “using a simple circuit which normalizes the photo-transistor’s output voltage and amplifies fluctuations”. The Arduino senses rises and falls in voltage on […]
Youtube user [npaltmp] hacked up a alphanumeric LCD from a defective answering machine, an ear clip pulse sensor from a stationary exercise bike and interfaced it with an Arduino “using a simple circuit which normalizes the photo-transistor’s output voltage and amplifies fluctuations”. The Arduino senses rises and falls in voltage on […]
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