Obstacle detection using ultrasonic sensors arduino program

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Obstacle detection using ultrasonic sensors arduino program

Obstacle Avoiding Robot is an intelligent device which can automatically sense the obstacle in front of it and avoid them by turning itself in another direction. This design allows the robot to navigate in unknown environment by avoiding collisions, which is a primary requirement for any autonomous mobile robot. The application of Obstacle Avoiding robot is not limited and it is used in most of the military organization now which helps carry out many risky jobs that cannot be done by any soldiers.

Here an Ultrasonic sensor is used to sense the obstacles in the path by calculating the distance between the robot and obstacle. If robot finds any obstacle it changes the direction and continue moving. Before going to build the robot, it is important to understand how the ultrasonic sensor works because this sensor will have important role in detecting obstacle.

The basic principle behind the working of ultrasonic sensor is to note down the time taken by sensor to transmit ultrasonic beams and receiving the ultrasonic beams after hitting the surface. Then further the distance is calculated using the formula.


To use this sensor, similar approach will be followed explained above. A sonic beam is transmitted with 8 pulses of 40KHz each. The Echo pin had already made high at the time sending high. The time taken by beam to return back is saved in variable and converted to distance using appropriate calculations like below.

We used ultrasonic sensor in many projects, to learn more about Ultrasonic sensor, check other projects related to Ultrasonic sensor. The components for this obstacle avoiding robot can be found easily. In order to make chassis, any toy chassis can be used or can be custom made. Complete program with a demonstration video is given at the end of this project. The program will include setting up HC-SR04 module and outputting the signals to Motor Pins to move motor direction accordingly.

No libraries will be used in this project. First define trig and echo pin of HC-SR04 in the program.

Detecting obstacle with IR Sensor and Arduino

The LMN has 4 data input pins used to control the direction of motor connected to it. In setup function, define the data direction of utilised GPIO pins.

In loop function, get the distance from HC-SR04 and based on the distance move the motor direction. The distance will show the object distance coming in front of the robot. The Distance is taken by bursting a beam of ultrasonic up to 10 us and receiving it after 10us. If the distance is greater than the defined distance means there is not obstacle in its path and it will moving in forward direction.

If the distance is less than the defined distance to avoid obstacle means there is some obstacle ahead. So in this situation robot will stop for a while and movebackwards after that again stop for a while and then take turn to another direction. So this is how a robot can avoid obstacles in its path without getting stuck anywhere. Find the complete code and video below. Recommended Posts. Didn't Make it to embedded world ? No problem! Fundamentals of IoT Security.

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From Nano-power to Light Speed. Raspberry Pi Connect. Get Our Weekly Newsletter! Helena St. Related Content.A list of references on lidar point cloud processing for autonomous driving. Processing an Image to find obstacles and the minimum path between two similar objects using OpenCV.

Lane and obstacle detection for active assistance during driving. Uses windowed sweep for lane detection. Combination of object tracking and YOLO for obstacles. Determines lane change, relative velocity and time to collision.

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More features would be added in the future, geared towards mobile robot platform. Eventual goal of this package is to solve the problem of given an image, where is the obstacle with respect to the robot in a 3D space. Implementing ROS nodes for core functionality of the autonomous vehicle system, including traffic light detection, control, and waypoint following!

This program detect and identify obstacle on railway. If program detect some obstacle that train must stop, program gives you warning sign. This program Also estimate riskiness of obstacle how it is negligible or not. We provide many models to you to detect railways and obstacles. Removes phantom obstacles from maps created from robot point clouds.

My goal is to come up with a simple and a basic model of an obstacle avoiding bot with the best possible algorithm to detect and avoid an obstacle using only One Ultrasonic Sensor module HCSR04 and 2 wheels. The project is still into development to find even better an algorithm to achieve the same task.

A machine learning software to detect nearby vehicles from camera feedback. Use lidar car data to detect incoming road obstacles track multiple cars on the road, estimating their positions and speed. This is a group project where we designed a autonomous trash delivery robot to help households deliver their trash from home to curb.

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obstacle detection using ultrasonic sensors arduino program

Using ultrasonic sensors to measure distance of obstacles, taking into account temperature and humidity that affect the speed of sound. Measuring distances from our robot to other objects is one of the most common data we want to obtain. For example, if we are building an autonomous vehicle, we want to check its distance from obstacles to help it make the right decision about its course. There are also many more examples of robots that we want them to activate mechanisms when something or someone gets close to them.

One of the simplest, cheapest, and most accurate ways to measure distances is by using ultrasonic sensors. Their working principle is based on the fact that sound is reflected upon most objects and materials. All ultrasonic sensors operate in a similar way. They send a short a few microseconds long ultrasonic burst from the transmitter and measure the time it takes for the sound to return to the receiver.

There is a wide variety of ultrasonic sensors on the market, for most robotics platforms. Some examples of using them in the classroom are:. If you are an Arduino or Raspberry Pi fan and want to dive more into how these sensors work, there are several options that you can find online. The most common and affordable choice is the HC-SR04, which costs less than a euro on ebay August For more details and comparative tests with various ultrasonic sensors, I advise you to watch two detailed videos here and here from Andreas Spiess channel on Youtube.

I am going to start from the second way easy and then stay longer on the first, which gives the programmer more control and as an educator I find it more interesting. Now I can write a simple program to print the distance obtained by the sensor to the Serial monitor. As an educator, I find it more interesting to dig in the working principal of things, even if that means more work for my students.

In order to do so in this example we will have to forget the luxury of the NewPing library and make all the calculations ourselves. I upload the program to my board and the sensor works as with the NewPing library, returning decimal values since all my variables are float. That is not actually true. In solid materials the speed of sound is greater than liquids and in liquids sound travels faster than through gases. The ultrasonic sensor sends sound through air which is a gas. In gases the speed of sound is affected mostly by the gas temperature, less by the gas humidity and even less by the gas pressure.

For example in air with pressure of 1 Atm and. There are many online calculators for the speed of sound. Since I had a cheap temperature — humidity sensor lying around DHT11 Temperature and Humidity SensorI decided to improve the calculations in my code, using these two values to estimate a more accurate speed of sound value.

First of all I embedded the new sensor in my schematic.

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The next step was to add the measurement of temperature and humidity in my code using the dht. I followed the step by step tutorial from Brainy Bits and now the only thing I needed was to calculate the actual speed of sound. With a few tweaks to adjust it to my code the full program is as follows:. I uploaded the program to my board and starting testing. I was happy to have more accurate measurements, even if that does not play a significant role in small distances of few cm.

The use of ultrasonic sensors in educational robotics is very common and there are hundreds of examples over the internet, either using the Lego platform or Arduino and Raspberry pi. Recently tinkercad added a new command block for getting the distance from an ultrasonic sensor. I find particularly interesting, for educational purposes, the analytical way of calculating the distance, from the time the sound takes to travel to the obstacle and back. In a previous project smart trash canthat we implemented with my students from the evening club Young Hackerswe spent a lot of time to fully understand the algorithm that calculates distance from time using an analytical worksheet in greek.

We implemented the algorithm using a block style language Ardublockly that helped students a lot to understand every step of the way. Please log in or sign up to comment.For the demonstration purposes, I will use an Led which will be controlled depending on the distance of the object from the HC-SR04 Sensor. This LED will be controlled as per the pre-defined value. The Obstacle detection range can be adjusted in the programming. The same programming can also be used in the Robot for detecting any Obstacle, or it can be used in a security project, or the same idea can also be used in making the touch-less doorbell system.

For the Step by Step explanation, you can watch a video tutorial given at the end of this Article. The components and tools used in this project can be purchased from Amazon, the components Purchase links are given below:.

Please Note: these are affiliate links. I may make a commission if you buy the components through these links. I would appreciate your support in this way! Dimension: 45mm x 20mm x 15mm. This schematic is designed in Cadsoft eagle 9.

A ohm resistor is connected in series with a 2. This is a current limiting resistor. I have a very detailed tutorial on led and how to calculate the current limiting resistor value; you can watch the following tutorial.

The resistor is connected with pin number 13, while the cathode side of the LED is connected with the ground.

I connected the green wire with pin number 2. I also connected an LED with pin number 13 through a resistor. After I uploaded this program into the Arduino Uno, I was able to detect objects and was also able to measure the distance.

Table of Contents. Recommended For You. Leave a Reply Cancel reply.It barely takes 15 minutes to do this!

Detecting Obstacles and Warning - Arduino and Ultrasonic

I have a detail tutorial on ultrasonic sensor HC SR which will guide you throughout! For more clarity, I have made a separate tutorial for you on interfacing Arduino with Motor driver module LN. I have provided the connections as well as the code for it.

Control LEDs with help of Android in 5 mins. Control LEDs with Voice commands in 5 mins. If the distance detected by the ultrasonic sensor is less than 25cm, then the bot will take a turn else, it will keep moving straight! Simple… right? Well, here is a video tutorial which will make your job more easy! Do I need to say this, NO… but anyway I will. Hi Dika, please check the connections again or there is a minor chance that your module must have fried because of prior wrong connection!

This is one of the best websites i have ever visited for doing my school projects. I just did a little modification. I actually attached a overhead roof and attached a bottle. This was a automatic floor cleaner. It won me a silver medal. Hello Megh, Thank you very much for your kind and encouraging comment! A great, quick and simple modification Megh. Glad to know I could help you! Your email address will not be published.

Notify me of follow-up comments by email. Notify me of new posts by email. Skip to content MechStuff ''Making stuff… Simpler''. Toggle navigation.Add the following snippet to your HTML:. This is tutorial to help you understand ultrasonic and buzzer and go deeper into learning Arduino, follow these steps and give me feedback.

Project tutorial by Ammar Atef Ali. This is tutorial to help you understand ultrasonic and buzzer and go deeper into learning Arduino, follow these steps and give me feedback please. Connect the Buzzer positive terminal to the Arduino pin 2 and the negative terminal to the Gnd. You can find code in codebender. This is copy of the code any way. Watch this video for it working, record you video and show me, give me your feedback and i love to answer your questions.

Please log in or sign up to comment. It is a simple tutorial on how to create little a security device using an Arduino. Generates maps based on distance between itself and obstacles autonomously and provides visual feedback. Project tutorial by Satyavrat Wagle.

obstacle detection using ultrasonic sensors arduino program

This is a beginner's guide to making your first Arduino robot. Smart phone controlled, wall follower and obstacle avoiding robot. Project tutorial by Muhammed Azhar. Sign In. My dashboard Add project.

Obstacle Avoiding Robot Using Ultrasonic Sensors

Project tutorial. Detecting Obstacles and Warning - Arduino and Ultrasonic This is tutorial to help you understand ultrasonic and buzzer and go deeper into learning Arduino, follow these steps and give me feedback. Untitled file. Untitled file Arduino.

obstacle detection using ultrasonic sensors arduino program

Author Ammar Atef Ali 2 projects 44 followers Follow. Respect project. Similar projects you might like.

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Ultrasonic Security System Project tutorial by Ivan 42, views 33 comments 98 respects.This project is designed to build a robot that automatically detects the obstacle on its path and guides itself whenever an obstacle comes ahead of it. This robotic vehicle is built, using Arduino UNO board. An ultrasonic sensor is used to detect any obstacle ahead of it. A motor driver IC and 2 DC motors are used for controlling the movement of the robot.

A servo motor is also used in this project. The ultrasonic sensor is then mounted on the servo and by rotating the servo to different angles we will obtain the readings from the ultrasonic sensor in those angles.

obstacle detection using ultrasonic sensors arduino program

This will help the controller to detect the exact path to navigate. A Bluetooth module is also added to the project which is optional in order to control the robot from your android phone when it is in manual mode.

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HC SR04 is the ultrasonic sensor that we are using here. The ultrasonic sensor has 4 pins: Vcc, Trig, Echo and Gnd. Vcc and Gnd are connected to the supply pins of the Arduino. Trig is connected to the 11th pin and Echo is connected to 10th pin of the Arduino. It is a 16 pin IC which can drive two motors simultaneously. Pins 2 and 7 are control inputs from microcontroller for first motor.

They are connected to pins A0 and A1 of Arduino respectively. Similarly, pins 10 and 15 are control inputs from microcontroller for second motor. They are connected to pins A2 and A3 of Arduino. When the robot is switched ON, both the motors of the robot will run and the robot moves forward. During this time, the ultrasonic sensor continuously calculate the distance between the robot and the obstacle in front of it.

If the distance between the robot and the obstacle is less than 30cm, the robot will stop moving and rotate the sensor using servo motor to take readings in different angles. That will be the path with less obstacle. It is used here for controlling the robot with your android phone. You can simply download and install it on your phone.


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