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 […]
Tag Archives: IR LED
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 […]
USB IR Toy preorder 1 defect
Unfortunately there’s a defect in the first batch of USB IR Toys. The infrared LED is backwards and does not emit properly. Ytsirk caught this defect and documented the issue in the forum.We’re really sorry about this bug, and we’ve done our best to track it and identify the cause. We used a Cadsoft Eagle […]