★ input → process → output

something is inputted → processing takes place → something is outputted

microprocessors uses this

things like computers, air conditioners, calculators, washing machines etc has microprocessors

example of input devices:

• camera
• microphone
• keyboard
• trackpad
• mouse
• buttons
• sensors (e.g. pulse, light, heat, etc)

actuators: output devices

examples:

• screen
• speaker
• lights