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2.2.4 IR Obstacle Avoidance Sensor

Introduction

In this project, we will learn IR obstacle avoidance module, which is a sensor module that can be used to detect obstacles at short distances, with small interference, easy to assemble, easy to use, etc. It can be widely used in robot obstacle avoidance, obstacle avoidance trolley, assembly line counting, etc.

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	Raphael Kit

You can also buy them separately from the links below.

COMPONENT INTRODUCTION	PURCHASE LINK
GPIO Extension Board	BUY
Breadboard	BUY
Jumper Wires	BUY
Obstacle Avoidance Module	BUY

Schematic Diagram

Experimental Procedures

Step 1: Build the circuit

Step 2: Change directory.

cd ~/raphael-kit/python-pi5

Step 3: Run.

sudo python3 2.2.5_IrObstacle_zero.py

After the code runs, when you put your hand in front of the module’s probe, the output indicator on the module lights up and the “Detected Barrier!” will be repeatedly printed on the screen until the your hand is removed.

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 Button
import time

# Initialize the obstacle sensor connected to GPIO pin 17
# The sensor is configured with a pull-up resistor
obstacle_sensor = Button(17, pull_up=True)

try:
   # Continuously monitor for obstacles
   while True:
      if obstacle_sensor.is_pressed:  # Check if the sensor is triggered
            print("Detected Barrier!")  # Print a message when an obstacle is detected
            time.sleep(1)  # Delay for 1 second to avoid repetitive messages

except KeyboardInterrupt:
   # Handle KeyboardInterrupt (Ctrl+C) for a clean and safe exit
   pass

Code Explanation

1. This line sets the script to run using Python 3. It imports the Button class from gpiozero (used for the obstacle sensor) and the time module for delays.

   #!/usr/bin/env python3
   from gpiozero import Button
   import time
   

2. Initializes an obstacle sensor connected to GPIO pin 17 with an internal pull-up resistor.

   # Initialize the obstacle sensor connected to GPIO pin 17
   # The sensor is configured with a pull-up resistor
   obstacle_sensor = Button(17, pull_up=True)
   

3. In a continuous loop, the program checks if the obstacle sensor is activated (is_pressed). If an obstacle is detected, it prints “Detected Barrier!” and then waits for one second (to prevent repetitive messages). The try-except structure is used to handle a KeyboardInterrupt for a clean exit.

   try:
      # Continuously monitor for obstacles
      while True:
         if obstacle_sensor.is_pressed:  # Check if the sensor is triggered
               print("Detected Barrier!")  # Print a message when an obstacle is detected
               time.sleep(1)  # Delay for 1 second to avoid repetitive messages
   
   except KeyboardInterrupt:
      # Handle KeyboardInterrupt (Ctrl+C) for a clean and safe exit
      pass