.. note::

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.. _per_service_bell:

2.3 Service Bell
==========================

For this project we used a microswitch and an active buzzer to create a service bell. Tap the switch and the buzzer makes a sound.

Micro Switch is also a 3-pin device, the sequence of the 3 pins are C (common pin), NO (normally open) and NC (normally closed).

When the micro switch is not pressed, 1 (C) and 3 (NC) are connected together, when pressed 1 (C) and 2 (NO) are connected together.

|img_micro_switch|

**Required Components**

In this project, we need the following components. 

It's definitely convenient to buy a whole kit, here's the link: 

.. list-table::
    :widths: 20 20 20
    :header-rows: 1

    *   - Name	
        - ITEMS IN THIS KIT
        - LINK
    *   - Kepler Kit	
        - 450+
        - |link_kepler_kit|


You can also buy them separately from the links below.


.. list-table::
    :widths: 5 20 5 20
    :header-rows: 1

    *   - SN
        - COMPONENT	
        - QUANTITY
        - LINK

    *   - 1
        - :ref:`cpn_pico_w`
        - 1
        - |link_picow_buy|
    *   - 2
        - Micro USB Cable
        - 1
        - 
    *   - 3
        - :ref:`cpn_breadboard`
        - 1
        - |link_breadboard_buy|
    *   - 4
        - :ref:`cpn_wire`
        - Several
        - |link_wires_buy|
    *   - 5
        - :ref:`cpn_resistor`
        - 2(1KΩ, 10KΩ)
        - |link_resistor_buy|
    *   - 6
        - :ref:`cpn_capacitor`
        - 1(104)
        - |link_capacitor_buy|
    *   - 7
        - :ref:`cpn_micro_switch`
        - 1
        - 
    *   - 8
        - :ref:`cpn_transistor`
        - 1(S8050)
        - |link_transistor_buy|
    *   - 9
        - Active :ref:`cpn_buzzer`
        - 1
        - 

**Wiring**

|service_bell0|

* By default, pins 1 and 3 of the Micro Switch are connected together and GP14 is low. When the Micro Switch is pressed, GP14 is high.
* GP15 outputs high to make the buzzer sound.

**Code**

.. note::

    * You can refer to the image below to write code by dragging and dropping. 
    * Import ``2.3_service_bell.png`` from the path of ``kepler-kit-main\piper``. For detailed tutorials, please refer to :ref:`import_code_piper`.


|service_bell|

After connecting Pico W, click the **Start** button and the code starts to run. Tap the switch and the buzzer makes a sound.

.. note::
    This project code is exactly the same as the previous project :ref:`per_button`.