A sensor (or detector) is a device, module, machine, or subsystem whose purpose is to detect events or changes in its environment and send the information to other electronics (frequently a computer processor) or electromechanical components. A sensor is always used with other electronics or components serving as in input device or signal actuator. Sensors may be used to detect and measure temperature, pressure, humidity, voltage, amperage, viscosity, flow, motion, light, the presence of gasses or liquids, vibration, force, speed and more.
An ignitor is a device used to initiate combustion - the sequence of exothermic chemical reactions between a fuel and an oxidant accompanied by the production of heat and conversion of a chemical state. The release of heat can also result in the production of light in the form of either glowing or a flame. A gas lighter is a firestarting mechanism used to ignite gas stoves which do not have automatic ignition systems. It relies on a physical phenomenon called the piezoelectric effect to generate an electric spark, which ignites the combustible gas from the stove burner.
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