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!
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.
It’s definitely convenient to buy a whole kit, here’s the link:
Name |
ITEMS IN THIS KIT |
LINK |
---|---|---|
Raphael Kit |
337 |
You can also buy them separately from the links below.
COMPONENT INTRODUCTION |
PURCHASE LINK |
---|---|
Schematic Diagram¶
Experimental Procedures¶
Step 1:: Build the circuit.
Step 2: Change directory.
cd ~/raphael-kit/python-pi5
Step 3: Run.
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.
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.
#!/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
andButton
fromgpiozero
for controlling GPIO devices, andsleep
fromtime
for delays.#!/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.
# 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.
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