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.

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	PURCHASE LINK
Kepler Kit	450+	Kepler Kit

You can also buy them separately from the links below.

SN	COMPONENT INTRODUCTION	QUANTITY	PURCHASE 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

sch_limit_sw

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

wiring_limit_sw

Code

Note

You can open the file 2.8_press_gently.ino under the path of kepler-kit-main/arduino/2.8_press_gently.
Or copy this code into Arduino IDE.

Don’t forget to select the board(Raspberry Pi Pico) and the correct port before clicking the Upload button.

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