.. 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 [|link_sf_facebook|] and join today!
.. _2.1.3_py_pi5:
2.1.3 Touch Switch Module
=================================
Introduction
-------------------
In this project, you will learn about touch switch module. It can replace the traditional kinds of switch with these advantages: convenient operation, fine touch sense, precise control and least mechanical wear.
Required Components
------------------------------
In this project, we need the following components.
.. image:: ../python_pi5/img/2.1.3_touch_switch_list.png
:width: 700
:align: center
It's definitely convenient to buy a whole kit, here's the link:
.. list-table::
:widths: 20 20 20
:header-rows: 1
* - Name
- ITEMS IN THIS KIT
- LINK
* - Raphael Kit
- 337
- |link_Raphael_kit|
You can also buy them separately from the links below.
.. list-table::
:widths: 30 20
:header-rows: 1
* - COMPONENT INTRODUCTION
- PURCHASE LINK
* - :ref:`cpn_gpio_extension_board`
- |link_gpio_board_buy|
* - :ref:`cpn_breadboard`
- |link_breadboard_buy|
* - :ref:`cpn_wires`
- |link_wires_buy|
* - :ref:`cpn_resistor`
- |link_resistor_buy|
* - :ref:`cpn_led`
- |link_led_buy|
* - :ref:`cpn_touch_switch`
- |link_touch_buy|
Schematic Diagram
-----------------
.. image:: ../python_pi5/img/2.1.3_touch_switch_schematic.png
:width: 500
:align: center
Experimental Procedures
------------------------------
**Step 1::** Build the circuit.
.. image:: ../python_pi5/img/2.1.3_touch_switch_circuit.png
:width: 700
:align: center
**Step 2:** Change directory.
.. raw:: html
.. code-block::
cd ~/raphael-kit/python-pi5
**Step 3:** Run.
.. raw:: html
.. code-block::
sudo python3 2.1.3_TouchSwitch_zero.py
While the code is running, the red LED lights up; when you tap on the touch switch module, the yellow LED turns on.
.. warning::
If there is an error prompt ``RuntimeError: Cannot determine SOC peripheral base address``, please refer to :ref:`faq_soc`
**Code**
.. note::
You can **Modify/Reset/Copy/Run/Stop** the code below. But before that, you need to go to source code path like ``raphael-kit/python-pi5``. After modifying the code, you can run it directly to see the effect.
.. raw:: html
.. code-block:: python
#!/usr/bin/env python3
from gpiozero import LED, Button # Import LED and Button classes from gpiozero
from time import sleep # Import sleep for delay
# Initialize touch sensor (Button) on GPIO pin 17, pull-up resistor disabled
touch_sensor = Button(17, pull_up=False) # Suitable for sensors that pull the pin low when pressed
# Initialize LED1 and LED2 connected to GPIO pins 22 and 27 respectively
led1 = LED(22) # LED1 connected to GPIO pin 22
led2 = LED(27) # LED2 connected to GPIO pin 27
try:
# Continuously monitor the state of the touch sensor and control LEDs accordingly
while True:
if touch_sensor.is_pressed: # Check if the touch sensor is pressed
print('You touch it!') # Output message indicating sensor activation
led1.off() # Turn off LED1
led2.on() # Turn on LED2
else: # If the sensor is not pressed
led1.on() # Turn on LED1
led2.off() # Turn off LED2
sleep(0.5) # Pause for 0.5 seconds before rechecking the sensor state
except KeyboardInterrupt:
# Handle a keyboard interrupt (Ctrl+C) for a clean exit from the loop
pass
**Code Explanation**
#. This line sets the script to run with Python 3. It imports ``LED`` and ``Button`` from ``gpiozero`` for controlling GPIO devices, and ``sleep`` from ``time`` for delays.
.. code-block:: python
#!/usr/bin/env python3
from gpiozero import LED, Button # Import LED and Button classes from gpiozero
from time import sleep # Import sleep for delay
#. Initializes a touch sensor (as a Button) on GPIO pin 17 with pull-up disabled, and two LEDs on GPIO pins 22 and 27.
.. code-block:: python
# Initialize touch sensor (Button) on GPIO pin 17, pull-up resistor disabled
touch_sensor = Button(17, pull_up=False) # Suitable for sensors that pull the pin low when pressed
# Initialize LED1 and LED2 connected to GPIO pins 22 and 27 respectively
led1 = LED(22) # LED1 connected to GPIO pin 22
led2 = LED(27) # LED2 connected to GPIO pin 27
#. The main loop checks the state of the touch sensor. When touched, LED2 turns on and LED1 off; when not touched, LED1 is on and LED2 off. The loop repeats every 0.5 seconds. Catches a KeyboardInterrupt (like Ctrl+C) to allow for graceful script termination.
.. code-block:: python
try:
# Continuously monitor the state of the touch sensor and control LEDs accordingly
while True:
if touch_sensor.is_pressed: # Check if the touch sensor is pressed
print('You touch it!') # Output message indicating sensor activation
led1.off() # Turn off LED1
led2.on() # Turn on LED2
else: # If the sensor is not pressed
led1.on() # Turn on LED1
led2.off() # Turn off LED2
sleep(0.5) # Pause for 0.5 seconds before rechecking the sensor state
except KeyboardInterrupt:
# Handle a keyboard interrupt (Ctrl+C) for a clean exit from the loop
pass