TRACK YOUR TICKER WITH A HOMEMADE ELECTROCARDIOGRAM MACHINE.
THE HEART’S PUMPING ACTION IS DRIVEN by powerful waves of electrical activity that cause weak currents to flow in the body, changing the electric potential between different points on the skin by about one thousandth of a volt (one millivolt, 1mV). Hidden within that activity is an enormous amount of information about what the heart is doing, and anyone who can detect it can peer into the workings of this incredible organ.
Fortunately, you don’t have to be a cardiologist with expensive equipment to pick up and decipher that signal. Anyone can do it with this homemade electrocardiogram (ECG) device, an analog-to-digital converter (ADC) to digitize ...