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Lesson 75: Obstacle detection using laser transmitter and receiver with Arduino

Part 8: Obstacle Avoidance with Arduino

This video shows you how to detect obstacle using very simple Infrared module, using Arduino. Timign in the video

  • 00:00 Introduction
  • 01:47 Wiring Explained
  • 02:26 Code Explained
  • 03:59 Demonstration

 * Lesson 75: Using Solid State Relay  with Arduino
 * This is the Arduino code Infrared Obstacle Avoidance module
 * Written by Ahmad Shamshiri for 
 * on Jan 15, 2019 at 20:45 in Ajax, Ontario, Canada

  Watch instruction video for this code:
  This video is part of Arduino Step by Step Course which starts here:


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 * This code is "AS IS" without warranty or liability. Free to be used as long as you keep this note intact.* 
 * This code has been download from
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <>.
int signalPin = 8;
void setup() {
 pinMode(signalPin, INPUT);// set signalPin as input


void loop() {
  //Written for Robojax on Dec 28, 2017
  int detect = digitalRead(signalPin);// read obstacle status and store it into "detect"
  if(detect == LOW){
   Serial.println("Obastacle on the way"); 
   Serial.println("All clear");  


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