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!

2.2.5 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.

../_images/2.2.5IR_Obstacle1.png

Required Components

In this project, we need the following components.

../_images/2.2.5component.png

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

../_images/IR_schematic.png

Experimental Procedures

Step 1: Build the circuit

../_images/2.2.5fritzing.png

Step 2: Go to the folder of the code.

cd ~/raphael-kit/nodejs/

Step 3: Run the code.

sudo node ir_obstacle.js

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

const Gpio = require('pigpio').Gpio;

const ir_ob = new Gpio(17, {
   mode: Gpio.INPUT,
   pullUpDown: Gpio.PUD_DOWN,
   edge: Gpio.FALLING_EDGE
});

ir_ob.on('interrupt', () => {
   console.log('Detected Barrier!');
});

Code Explanation

const Gpio = require('pigpio').Gpio;

const ir_ob = new Gpio(17, {
   mode: Gpio.INPUT,
   pullUpDown: Gpio.PUD_DOWN,
   edge: Gpio.FALLING_EDGE
});

Import the pigpio module, create an object to control the IO port Gpio17, Set it to input mode and interrupt on falling edge.

ir_ob.on('interrupt', () => {
   console.log('Detected Barrier!');
});

When an interrupt is triggered, meaning an obstacle is detected, print “Detected Barrier!”.

Phenomenon Picture

../_images/2.2.5IR.JPG