2.8 Press Gently

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.

• 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:

Name	ITEMS IN THIS KIT	LINK
Kepler Kit	450+	Kepler Kit

You can also buy them separately from the links below.

SN	COMPONENT	QUANTITY	LINK
1	Raspberry Pi Pico W	1	BUY
2	Micro USB Cable	1
3	Breadboard	1	BUY
4	Jumper Wires	Several	BUY
5	Resistor	1(10KΩ)	BUY
6	Capacitor	1(104)	BUY
7	Micro Switch	1

Schematic

By default, GP14 is low and when pressed, GP14 is high.

The purpose of the 10K resistor is to keep the GP14 low during pressing.

The 104 ceramic capacitor is used here to eliminate jitter.

Wiring

Code

Note

• Open the 2.8_micro_switch.py file under the path of kepler-kit-main/micropython or copy this code into Thonny, then click “Run Current Script” or simply press F5 to run it.

• Don’t forget to click on the “MicroPython (Raspberry Pi Pico)” interpreter in the bottom right corner.

• For detailed tutorials, please refer to Open and Run Code Directly.

import machine
import utime
button = machine.Pin(14, machine.Pin.IN)
while True:
    if button.value() == 1:
        print("The switch works!")
        utime.sleep(1)

After the program runs, when you toggle the slide switch to the right, “The switch works!” will appear in the shell.