Over the years as technology advanced and grew at a tremendous pace, so did the horizon of ideas and creation in our mind. If we look a few years back, a teenager like me would dare think about creating a robot that would operate listening to their voice and follow the given commands. All they could do was dream about making such a fancy robot and let the idea pass from their mind. But with the help of today’s technology, those great ideas are no more left being dreams but are coming true. Having not to deal anymore with complex circuits, Arduino gives us a very simple approach into building projects that were once impossible to make unless you were a genius and had all the materials required for making such a project.
In this Instructables, I have accomplished a project that was once a dream to me. With the help of materials and components that I found lying around in my house, I ended up making this simple yet fascinating voice controlled robot with the help of an Arduino UNO.
If you find this helpful and fascinating, do drop a vote for me in the “first time author” contest.
Step 1: Gather the Materials Needed
- Arduino UNO – 1x
- L293D motor driver – 1x
- Servo motor (MG995) – 1x
- DC gear motor – 4x
- HC-05 bluetooth module – 1x
- Ultrasonic distance sensor – 1x
- Mini breadboard – 1x
- 3.7v LiPo battery – 2x
- Jumper wires
- Chassis – 1x
- Rubber wheels – 4x
- Soldering iron
- Double sided tape (or you can use hot glue if you have a glue gun)
- Scotch tape
Step 2: Building the Base
Step 3: Getting Into the Circuit Part 1
After the motor driver is fixed properly on top of the Arduino board, take the motor wires one by one and with the help of a screwdriver, connect the wires of motor 1 to M1 of the motor driver, then motor 2 to M2,then motor 3 to M3, and finally motor 4 to M4. Make sure there’s no loose connection.
Step 4: Getting Into the Circuit Part 2
Once the bluetooth module is connected, place the Servo Motor (MG995) right at the front of the chassis. I have attached the servo with the help of double sided tape, but if you have a glue gun, then you can use that as well.
Finally, fix the Ultrasonic Distance Sensor on top of the servo’s head. In my case, I used a thin layer of polystyrene. I inserted the pins of the sensor into the polystyrene as it’s a soft and light material.
Connect the three wires coming out of the servo to the specific ‘servo ports’ on the motor driver.
In the end, connect the two 3.7v LiPo batteries to the motor driver’s power source. Once done, you’re ready with the hardware.
Step 5: Uploading the Software
Before uploading the code onto the Arduino, you’ll need to download the ‘AFMotors’ library. You will need to go to: https://learn.adafruit.com/adafruit-motor-shield/library-install and download the respective library. Once downloaded, open the Arduino IDE, go to the library section and click of the ‘AFMotors’. You will also need to select the ‘Servo’ library which comes preinstalled with the Arduino IDE.
IMPORTANT: Before uploading the code onto your robot, make sure the RX and TX pin of the bluetooth module is disconnected. Also, make sure you choose the correct Port and Micro-controller before uploading the code.
Step 6: Install the App on Your Smartphone
(To make it simpler, I’ve attached two pictures of how to connect the robot’s bluetooth module with your smartphone.)
Step 7: Command Your Newly Built Robot
To make the robot turn left or right, command, “turn left” or “turn right”. While your robot is performing a specific task, if you want it to stop doing what it’s doing, simply command, “stop”.
Read more: Arduino Voice Controlled Robot