Sensor types Analog and Digital Sensors

TYPES OF Electrical SENSORS:

There are two types of sensors

· Digital sensors provide simple on/off or true/false results or the stepped binary results. A switch is a good example of a digital sensor: either the switch is open or it’s closed. An ultrasonic ranger, which returns a binary value, with each bit indicating a specific distance, is also a digital sensor.

· Analogue sensors provide a range of values, usually a voltage. In many cases, the sensor itself provides a varying resistance or current, which is then converted by an external circuit into a voltage. For example, when exposed to light the resistances of a CdS (cadmium sulfide) cell changes dramatically. Built in a simple voltage divider, the voltage output varies with the light striking the CDS cell.