Easy Pulse heart rate sensor

Easy Pulse is a heart rate monitor using an IR LED and a light detector: Easy Pulse provides a reflective IR sensor with necessary instrumentation circuit to illustrate the principle of photoplethysmography as a noninvasive technique for measuring heart rate. In order for this sensor to work, the fingertip should be placed gently over the […]

Confessions of a prototyper: USB Infrared Toy

Confessions is a series where we share prototypes that didn’t quite work out. Read previous posts for the Bus Pirate, #twatch, and web platform here. The USB Infrared Toy took a few tries to get right. We’d like to fill you in on some things that happened behind the scenes before we released the v1 […]