Sensors
feeding information to a circuit and they are applied to some electronic devices which produce electrical signals electronically such as ultrasonic sensor, water level sensors, and IR sensor
Actuators
generally, mechanical devices which produce signals but by mechanical means such as switches
Transducer
conversion of energy from one form to another
every Transducer is a sensor ( or has a one ) but not every sensor has to be transducer
Author - Abdallah Hegab