Microcontroller and telephone: what they have in common

1. Step 1. Microcontroller — is part of — Remote control. A microcontroller sends the codes.
2. Step 2. Remote control — has part — Printed circuit board. Inside a remote is a circuit board with buttons and an infrared LED.
3. Step 3. Printed circuit board — is part of — Mobile phone. All of a phone's parts are soldered onto a printed circuit board.
4. Step 4. Mobile phone — evolved from — Telephone. A mobile phone keeps the function of a telephone, replacing the wire with a radio channel.

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