He’s built a finger-mounted pulse detector using a few simple components and an Arduino. This circuit uses a method ... to check out this standalone heartbeat sensor instead.

A polygraph is commonly known as a lie detector but it’s really just a machine with a number of sensors that measure things like heart rate, breathing rate, galvanic skin response and blood p… ...

Traditional lie detection depends on the venerable polygraph, first developed in 1921, a much more invasive apparatus with a set of wires attached to the skin. This new device promises non ...