Shopping Cart

⚡️ We’re Helping 1 Million People Build Their First Robots

🇺🇸 Proudly Women-Owned Small Business
robotics challenge ultrasonic sensor and arduino

Robotics Challenge: Ultrasonic Sensor

We sometimes use affiliate links in our content. This won't cost you anything, but it helps us to offset the costs of paying our writing team. You can support us directly on BuyMeACoffee. Thank you!

This week’s robotics challenge focuses on ultrasonic sensors and will enhance your programming skills by utilizing pre-existing code.

The true way to get good at something is to PRACTICE. I designed the robotics challenge to help you practice basic skills in an applied way.

Program an Ultrasonic Sensor: Have a Solution? Share Your Work!

Use #learnrobotics #roboticschallenge in your Facebook, Twitter, or Instagram post!

I want these challenges to be as interactive as possible, so if you include #review with your post, I will provide personal feedback on your solution.

Challenge Overview

You’re given three ultrasonic sensors and one Arduino Uno with necessary wiring used to prevent a 2WD mobile robot from driving into an obstacle. The motor control methods have already been written (and working 😛 ) and can be called using the following commands:

forward(motorName, duration); //forward for the specified motor & duration
backward(motorName, duration); //backward for the specified motor & duration
left(); //90-deg turn left
right(); //90-deg turn right
stop(motorName); //stop motor in current position

Here’s the current hardware configuration of the device.

Sale
Smraza 5pcs Ultrasonic Module HC-SR04 Distance...
Power supply: 5V DC; Quiescent current: less than 2mA.; Test distance = ((Duration of high level)*(Sonic :340m/s))/2
$11.99 −$1.40 $10.59
Sale
ARDUINO UNO R3 [A000066]
Arduino Uno is the most used and documented board in the world
$29.95 −$7.09 $22.86

Your Task

In this week’s robotics challenge, create a method, int avoidObstacles(int ultrasonicPin, int distance) in an Arduino-C program to prevent the robot from crashing into an obstacle using the ultrasonic sensors. You should be at least 3 inches away from the obstacle while running. You do not need to use all of the sensors. The purpose is to configure them appropriately to solve the issue.

Here’s a template to help you get started on a solution:

/* GLOBAL DEFINITIONS
 * Define your global variables here.
 */
 //left ultrasonic
 const int leftULTRATRIG=3; //pin on Digital port 3
 const int leftULTRAECHO=2;
//right ultrasonic
 //FILL THIS OUT
//center ultrasonic
 //FILL THIS OUT
/* REQUIRED METHOD
 * Configure your pins as inputs or outputs here.
 */
void setup(){
 //*** ultrasonics ***
 //*** motors ***
 //Setup Channel A - Right Side
  pinMode(12, OUTPUT); //Initiates Motor Channel A pin
  pinMode(9, OUTPUT); //Initiates Break Channel A pin
  //Setup Channel B - Left Side
  // FILL THIS OUT
}
/* Input Parameters: const int ultrasonicPin, int inputDistance
* Return Statement: bool
* Determines if the given ultrasonic sensor is within the given distance.
* Returns TRUE if the sensor is <= to input distance * Returns FALSE if the sensor is >= to input distance
* Use case: avoidObstacles(ultrasonicPin, inputDistance)
*/
bool avoidObstacles(const int ultrasonicPin, int inputDistance){
// fill this out
}
// OPTIONAL: Create additional helper methods here.
/* REQUIRED METHOD
* This method is like "main." Loops forever.
* The following comments are things to consider
* when determining your solution.
*/
void loop(){
// CHECK TO SEE IF THERE'S AN OBSTACLE WITHIN 3IN OF THE LEFT SIDE
// BACK UP & TURN IN THE OPPOSITE DIRECTION
// CHECK TO SEE IF THERE'S AN OBSTACLE WITHIN 3IN OF THE RIGHT SIDE
// BACK UP & TURN IN THE OPPOSITE DIRECTION
// CHECK TO SEE IF THERE'S AN OBSTACLE WITHIN 3IN OF CENTER
// BACK UP & TURN LEFT OR RIGHT
}

This template is provided as a GUIDELINE. You do not need to use it in your solution, as there are many ways to solve this problem.

It’s there if you need a quick nudge in the right direction. As always, if you’re really stuck, feel free to ask a question below or Tweet Us (@learnroboticsx) for help!

Not sure how this works?

Get the Robotics Engineering Bundle and learn how to interface electronics, software, and sensors to create autonomous devices and robots.

Support Content Like This

You May Also Like

Have a question? Need Help?

Thanks for dropping by! Comments are no longer moderated daily.
Before posting your comment, please consider buying a coffee.
If you'd like to work with Liz, you can schedule a call here.

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Learn Robotics Botly Favicon

Become a Learn Robotics Insider

 

Be the first to know when we launch new robotics content. Plus gain FREE robotics tips to your inbox.

Awesome! Check your inbox for a surprise!

Remote Robotics Courses for High School, Middle School, or Pre-College Training

Join the Powered by Learn Robotics Program

Teach robotics anywhere with our turnkey robotics program!

Download our free program brochure!

Success! Check your email for the download!