Advicy Drive-Safety Wearable Prevents Drowsy Driving
 Photoplethysmography sensors are popular in hospitals to measure your heart beat. Watch the video below that NickTech did that shows how the hobbiest can play with this technology. You can get a sensor ready to go from places like AdaFruit and SparkFun. Advicy uses this type of sensor to detect when you are driving drowsy. Sounds like a great product but I am also thinking it is a