One can make different types of sensors. Some sensors have two states, “on” or “off”, or another words, “contact” or “no contact” like on/off switches of a light. Other sensors have range of states, like a dimmer of a light. The two state kind of sensors are digital sensors, and the sensors that has range is called analog sensors. We can build these sensors and read the resistance change with multimeter.
They show you how to make a fabric contact sensor, a resistive sensor, a pressure sensor and a voltage divider. Well worth checking out.
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