👆 Touch

📌 Description

The Touch key module is like a magic button. Instead of pressing it, you just touch it with your finger, and it reacts. It senses the touch using electricity in your skin.

🎯 Use

In our projects, the touch key is used to:

• Turn lights or devices on and off with a simple touch.
• Replace mechanical buttons with a smoother, modern option.
• Make robots more interactive and fun to use.

👉 Think of the touch key as the robot’s touchscreen button — you don’t press, you just touch.

 Module parameters

Pin name	Description
G	GND (Power Input)
V	VCC (Power Positive)
S	Digital signal pins

• Supply voltage: 3.3V/5V
• Connection: PH2.0 3P terminal
• Installation method: screw fixing

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🖥️ Code Explanation

import machine

pin25 = machine.Pin(25, machine.Pin.IN)    # Touch sensor input
pin26 = machine.Pin(26, machine.Pin.OUT)   # LED output

while True:
    if pin25.value() == 1:                 # If touch is detected
        pin26.value(1)                     # Turn LED ON
    else:
        pin26.value(0)                     # Turn LED OFF
    print(pin25.value())                   # Show sensor value (1 = touched, 0 = not touched)

Step by Step

1. import machine → Tools to control pins.
2. pin25 = machine.Pin(25, machine.Pin.IN) → Pin 25 reads the touch sensor (input).
3. pin26 = machine.Pin(26, machine.Pin.OUT) → Pin 26 controls the LED (output).
4. while True: → Loop that repeats forever.
5. if pin25.value() == 1: → Checks if the sensor is touched.
6. pin26.value(1) → Turns the LED on when touched.
7. else: → If not touched…
8. pin26.value(0) → Turns the LED off.
9. print(pin25.value()) → Shows the sensor’s state (1 or 0) on the computer screen.

👉 Together, this program makes the LED light up when you touch the sensor.

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✅ Conclusion of the Test

• If touching the sensor turns the LED on, and releasing it turns the LED off, the program is working correctly.
• This test shows how the robot can sense touch and react with an output (LED).
• Later, instead of just controlling a light, the touch sensor could be used to start motors, change modes, or trigger sounds.