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Lesson 08: IR Obstacle Avoidance Sensor Module

In this lesson, you’ll learn how to use the Raspberry Pi Pico W with an IR Obstacle Avoidance Sensor Module. We’ll walk you through setting up the sensor and writing a MicroPython script that continuously reads its value to detect obstacles. By monitoring changes in the sensor data, you’ll grasp how to use it for basic obstacle detection.

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
IR Obstacle Avoidance Sensor Module	BUY
Breadboard	BUY

Wiring

../_images/Lesson_08_Obstacle_Avoidance_Sensor_Module_bb.png

Code

from machine import Pin
import time

# Initialize obstacle avoidance sensor connected to pin 16 as input
obstacle_avoidance_sensor = Pin(16, Pin.IN)

while True:
    # Read and print the value of the obstacle avoidance sensor
    print(obstacle_avoidance_sensor.value())

    # Wait for 0.1 seconds before the next read
    time.sleep(0.1)

Code Analysis

Importing Libraries

The machine module is imported to interact with the GPIO pins, and the time module is used for adding delays.
```
from machine import Pin
import time
```
Setting Up the Sensor

The obstacle avoidance sensor is set up as an input device on GPIO pin 16. The Pin.IN parameter configures the pin as an input.
```
obstacle_avoidance_sensor = Pin(16, Pin.IN)
```
Reading Sensor Data in a Loop

The while True: loop continuously checks the sensor’s output. If the sensor detects an obstacle, it returns 0, which is printed out. The time.sleep(0.1) adds a small delay to make the readings more manageable.
```
while True:
    print(obstacle_avoidance_sensor.value())
    time.sleep(0.1)
```
Note

If the sensor is not working properly, adjust the IR transmitter and receiver to make them parallel. Additionally, you can adjust the detection range using the built-in potentiometer.