🔘 Button

📌 Description

A button switch is a simple part that turns something on or off when you press it. It’s like a light switch, but smaller and made for electronic projects.

🎯 Use

In our projects, buttons are used to:

• Start or stop actions.
• Control lights, sounds, or motors.
• Let the robot react when someone presses it.

👉 Think of the button as the robot’s hands — when you press it, the robot feels it and responds.

Module parameters

Pin name	Description
G	GND (Power Input Negative)
V	VCC (Power Input Cathode)
S	The signal is digitally output, low when pressed and high when released

• Supply voltage: 3.3V/5V

• Connection: PH2.0 terminal wire

• Installation method: double screw fixing

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🖥️ Code Explanation

import machine
import time
pin26 = machine.Pin(26, machine.Pin.OUT)   # LED connected to pin 26
pin17 = machine.Pin(17, machine.Pin.IN)    # Button connected to pin 17
while True:
    if pin17.value() == 0:   # If button is pressed
        pin26.value(1)       # Turn LED ON
        time.sleep(1)        # Keep it on for 1 second
    else:
        pin26.value(0)       # Turn LED OFF

Step by Step

1. import machine & import time → Tools to control pins and add pauses.
2. pin26 = machine.Pin(26, machine.Pin.OUT) → Pin 26 controls the LED (output).
3. pin17 = machine.Pin(17, machine.Pin.IN) → Pin 17 reads the button (input).
4. while True: → Loop that repeats forever.
5. if pin17.value() == 0: → Checks if the button is pressed.
6. pin26.value(1) → Turns the LED on.
7. time.sleep(1) → Keeps the LED on for 1 second.
8. else: → If the button is not pressed…
9. pin26.value(0) → Turns the LED off.

👉 Together, this makes the LED light up only when the button is pressed.

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✅ Conclusion of the Test

• If pressing the button makes the LED turn on for 1 second, the program is working correctly.
• This test shows how the board can read input (button press) and control output (LED).
• Later, we can use buttons to trigger more complex actions, like starting motors or changing modes.