A capacitor stores electric charge on two conductive surfaces when a voltage source is appled across it. The surface of your body acts like one of the charge plates in a capacitor. When they get ready to touch the knob on the door though, the charge quickly leaves their body and jumps to the door and zap! Rubbing the blanket creates a charge on their body. The person in the following picture is holding a fuzzy blanket. This is because something gave you a charge such as your clothing, a blanket, or maybe a furry pet. In the past you may have shocked yourself when touching a metal object that has an electrical path to the ground. Your body has some ability to accept an electric charge. Since the electrical nature of your body is part of touch sensing, let’s first see how your body acts like a capacitor. Touch sensing uses capacitance to detect when a pin or a conductive surface connected to a pin is touched by you. ![]() Some of the pins on your Adafruit Circuit Playground Express are designed to detect when they are touched.
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