Intro: Bluetooth Controlled Robot Car
were you always fascinated by RC cars ?
Ever wanted to make one yourself ? controlled by your own smartphone ? ----> lets start
So, hey guys, here in this project i have tried to make a Bluetooth controlled car with the help of Arduino. I have included each detail so you can understand it easily. Also you can watch the video which is more detailed. Watch it till end and you will learn to make it within 10 minutes.
I have added every circuit diagram and explanation possible to make it easy for you all to understand.
It is economical and is a good idea for your school / college project. You don't need any previous knowledge!
just follow this guide :P
Step 1: Materials Required
1. Any car chassis kit ( with BO motors, wheels and base )
I bought this kit- http://amzn.in/cMSnMTL
2. Arduino UNO
3. L298 motor drive
4. Hc-05 bluetooth module
5. two batteries ( I used Samsung 18650 rechargeable cell , 3.7V and 2600 mA both) Link: http://amzn.in/4j4RXI5
6. Jumper Wires
7. Electrical instruments ( Solder wire and iron )
8. mobile with bluetooth
Step 2: Solder All Motors & Attach Them to the Base
Solder each motor with a black and a red wire and attach them with the chassis as shown in the video.
join left side motor wires together as: red wire --> red wire and black wire --> black wire
similarly join motors on right side together as: red wire --> red wire and black wire --> black wire
Step 3: Join Wheels to All the Motors
don't apply too much pressure while pressing the wheels otherwise the chassis may get break.
Step 4: Join the Two Batteries in Series
Connect the batteries in series by joining with a tape. You can also keep a little piece of open wire between them so that they are well connected.
Now join red wire to positive terminal of battery and black wire to negative terminal.
Try to keep the voltage <= 9 volts. I used 2 batteries of 3.7 V so my total pack voltage was 7.4 volts. If you use to high voltage ( like >= 12 volts , there is a chance that your components will get heated and might burn )
If your batteries have more current rating- your motors will rotate fast. My battery current rating was 2260 mA which was enough to power 4 motors.
Caution: Don't accidentally connect positive terminal of battery to its negative terminal directly. It might burn your wires without any resistance.
Step 5: Connect Motors to Motor Drive
Join the red and black terminal of motors on each side, to the motor drive outputs.
Step 6: Connect Motor Drive to Arduino
Then join the four control pins of motor drive to the arduino 9th, 10th, 11th and 12th pin socket.
Step 7: Join Bluetooth Module to Arduino
Connect bluetooth module( BT ) HC-05 to arduino as shown in circuit diagram.
join BT module to arduino as: VCC --> 5V and GND --> GND
Step 8: Connect Motor Drive to Battery
Connect motor drive's power input socket, to positive and negative terminal of battery. also connect the negative terminal of battery to GND of arduino. Finally connect 3rd terminal to Vin of arduino.
You can also add a switch to start or stop the car as you wish.
Step 9: Upload the Code & Download the App
After uploading, disconnect the arduino from pc.
Now connect Rx of Hc-05 to Tx of arduino and Tx of Hc-05 to Rx of arduino.
(do not connect these before uploading the code otherwise it may burn your arduino while uploading the code)
Finally, download the Arduino Bluetooth control app.
Step 11: Pair With Bluetooth Module
Start the Car. Check that the LED of Bluetooth module is blinking fast without pairing.
Pair the HC-05 Bluetooth module with your smartphone. Enter password 1234. ( if it not works try 0000 )
After pairing open the app and choose HC-05 to pair with. Check the LED of Bluetooth module, its blinking rate would have been very slow now.
Step 12: Test Drive
Go to App --> Buttons
Press 1: Car moves forward. ( all wheels start moving forward )
Press 1: Car moves in reverse. ( all wheels start moving backward )
Press 3: Car turns to left side. ( Only right wheels move )
Press 4: Car turns to right side. ( Only left wheels move )
Step 13: Suggestions
make all your connections correct and tight. If they are loose then your car can stop while moving.
You can even build a obstacle avoiding robot as your next project.