[James] has been building a heart rate monitor using a very cool TI chip. He needed a way to test his device, and commercial ECG simulators, like all biotech devices, are absurdly expensive. [James] ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." If you are an athlete in training or simply keeping tabs on your vitals, measuring your heart rate is a ...

A heart rate monitor may be the key to unlocking your fitness goals. That’s because heart rate is a reliable indicator of your exercise input—it reflects the effort applied to every workout. Keeping ...