Sensing Project :: Papers

catching Project Project brief A new nursery is world developed for gardeners who be concerned about overheating plants in their on-line(prenominal) glasshouses. The new greenhouse has been built with opening windows but occasionally the windows of the greenhouse slips fully open and allow all of the trapped heat in the greenhouse to escape quickly. This is a major concern for serious gardeners. The attempt is to develop a sensing circuit that will sense whether the windows are fully open, so a gardener can be alerted of the problem. mental home ============ To begin we must know what a detector is. A sensor is an electrical component, which produces a signal in response to alteration in its surroundings, this maybe an alteration in a physical variable or by movement of objects. The sensor planned for the sensing circuit ensuring the windows are not fully open is a merry-go-round potentiometer. A rotary potentiometer is a component, whic h has three terminals. When the angle of rotation is changed on the components leg then the potential difference (often called voltage) is also changed. Once the voltage reaches a specific point a separate circuit could activate an dispirit showing that the window has slipped and is fully opened. The potential difference is the difference betwixt potential energy between two separate points. Alternatively a different sensing circuit could be used. A circuit with a thermistor (a component sensing change in temperature) could be used. In normal situations when the window would be fully closed the temperature in the greenhouse would be high so the output voltage from this circuit would be low. However if the windows were to slip open fully then the temperature inside the greenhouse would decrease so the output voltage would increase. The circuit could be linked to an alarm of some type so as when the voltage increases last(prenominal) a certain point when the window is fully open, the alarm go alerting the gardener to shut the windows again. A circuit containing a LDR (light subject resistor) could also be