Note

Hello, welcome to the SunFounder Raspberry Pi & Arduino & ESP32 Enthusiasts Community on Facebook! Dive deeper into Raspberry Pi, Arduino, and ESP32 with fellow enthusiasts.

Why Join?

Expert Support: Solve post-sale issues and technical challenges with help from our community and team.
Learn & Share: Exchange tips and tutorials to enhance your skills.
Exclusive Previews: Get early access to new product announcements and sneak peeks.
Special Discounts: Enjoy exclusive discounts on our newest products.
Festive Promotions and Giveaways: Take part in giveaways and holiday promotions.

👉 Ready to explore and create with us? Click [here] and join today!

Lesson 22: Touch Sensor Module

In this lesson, you’ll learn how to connect a touch sensor to the Raspberry Pi Pico W in order to control an onboard LED. By using straightforward Python code, you’ll configure the touch sensor as an input device. When the sensor detects a touch, it will send a signal to turn on the LED, providing a visual indication that a touch has been detected. Conversely, when there’s no touch, the LED stays off.

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
Universal Maker Sensor Kit	94	Universal Maker Sensor Kit

You can also buy them separately from the links below.

Component Introduction	Purchase Link
Raspberry Pi Pico W	BUY
Touch Sensor Module	BUY
Breadboard	BUY

Wiring

Code

from machine import Pin
import time

# Set GPIO 16 as an input pin to read the touch sensor state
touch_sensor = Pin(16, Pin.IN)

# Initialize the onboard LED of the Raspberry Pi Pico W
led = Pin("LED", Pin.OUT)

while True:
    if touch_sensor.value() == 1:
        led.value(1)  # Turn on the LED
        print("Touch detected!")
    else:
        led.value(0)  # Turn off the LED
        print("No touch detected")

    time.sleep(0.1)  # Short delay to reduce CPU usage

Code Analysis

Setting up the pins:

Here, we import necessary libraries and set up GPIO pins. The touch sensor is connected to GPIO 16 as an input, and the onboard LED is configured as an output.
```
from machine import Pin
import time

touch_sensor = Pin(16, Pin.IN)
led = Pin("LED", Pin.OUT)
```

Main loop and touch detection:

In an infinite loop, the code constantly checks the state of the touch sensor. If a touch is detected (value equals 1), the LED is turned on and a message is printed. Otherwise, the LED remains off, and a different message is printed. A short delay is added to reduce CPU usage.

while True:
    if touch_sensor.value() == 1:
        led.value(1)  # Turn on the LED
        print("Touch detected!")
    else:
        led.value(0)  # Turn off the LED
        print("No touch detected")

    time.sleep(0.1)  # Short delay to reduce CPU usage