Resistor R1 acts as a pull-up resistor to keep pin 2 biased off. Touching the on plate applies the AC voltage present on the surface of your skin, to the circuit and the LED glows.

Of any calisthenics exercise, pull-ups are the most difficult to perform and see improvements without significant time and effort.

Grab some dumbbells and get ready to let trainer Britany Williams lead you through a ripper of a back and biceps workout. You only need 20 minutes.

The pull-up resistor value in a usual system must be picked so that the standard-mode (weakest) device will pull the bus lower than 0.3*VDD when asserted low. However, the pull-up resistor must be ...