2.3 Electronic Doorbell System

This project constructs an electronic doorbell using a microswitch and active buzzer combination. Pressing the switch triggers audible notification.

The microswitch features three terminals with specific designations: C (common terminal), NO (normally open contact), and NC (normally closed contact).

In the default state, terminals 1 (C) and 3 (NC) maintain electrical continuity, while activation connects terminals 1 (C) and 2 (NO).

../_images/DoorBell_micro_pic.png

Required Components

  • Raspberry Pi Pico W x1

  • MicroUSB cable x1

  • 830 Tie-Points Breadboard x1

  • Micro Switch x1

  • Transistor S8050 x1

  • Active Buzzer x1

  • Resistor 1KΩ x1

  • Resistor 10KΩ x1

  • Capacitor 104 x1

  • Jumper Wire Several

Circuit Configuration

../_images/DoorBell_Wiring.png

  • In the resting position, microswitch terminals 1 and 3 form a closed circuit, maintaining GP14 at low potential. Switch activation establishes GP14 high state.

  • GP15 generates high output signal to activate buzzer operation.

Programming Code

Note

  • Follow the visual programming guide below using drag-and-drop techniques.

  • Load 2.3_Door_Bell.png from the directory Ultimate-Starter-Kit-for-Pico-W\Piper_Make. For comprehensive guidance, see Loading Existing Projects.

../_images/DoorBell_Code.png

Upon Pico W connection, press the Start button to begin program execution. Switch activation produces audible buzzer output.