INPUT COMPONENTS

INPUT COMPONENTS

In previous section, you learnt that a electronic system consists of an Input , Process and Output.  In this section, you will learn more about the Input part /Input component of an electronic system. The Input is used for activating the system or for gathering information. Inputs to a electronic system can come from components such as Switches and  Sensors.  In subsequent section, you learn more about these  input components.

types of switches to serve different applications.  Table  1 and 2 below shows different types of switches, with their  electrical symbol and functions. Membrane Switch Besides the convention switches in Table 1 and 2 above, there is another type of switch that does not use moving parts. This membrane switch can be found in ATM machines andin your calculators.  It usually consists of a silicon rubber coated with conductive ink.  When depressed, it will come in contact with electrical contacts to close a circuit. See Fig. 1 and Fig. 2                                                                                 Fig.1 http://www.ssi-electronics.com/membrane%20switches SENSORS Besides switches, sensors are used as an input component in a circuit.  Typical usage of these sensors includes the night light in the house, motion sensors  to detect a person stepping into a toilet and in  alarm systems to detect intruders. Types of Input Sensors