Sensors and Actuators   Sensors Actuators Definition Sensors capture information (temperature, pressure, force,etc.) from the surrounding environment. They are input devices Actuators, on the other hand, create changes in the surrounding environment. They are output devices Types Sensors are termed digital or analog depending on the type of signal they generate (analog digital), correct? Are these sensors that can output both digital and analog signals?   Actuators can operate on Analogue. However, some actuators, like LEDs, can be operate with both analog and digital input signal. LEDs can be operated via PWM or even using an analog signal to light them up at some intermediate brightness. Types of Sensors in Arduino Here are some commonly used sensors you'll come across when working with Arduino: Temperature sensor: Measures the temperature and humidity of the environment.