If you’re looking for a robotics project to build. And if you want to be fun, quick, and easy this is the robot project for you. I found it at https://www.hackster.io/lovelyideas-in/arduino-remote-car-using-bluetooth-hc-05-android-app-control-3da97d Mr. Jones Kys did a wonderful job developing this. Everything you need is available for download, including the Arduino sketch, schematic, and Android app.
Bill Of Materials:
- Arduino – Uno,Nano, or Pro-Mini will work. Possibly others as well.
- HC-05 Bluetooth module
- Two DC motors and a chassis (you can be creative with the chassis)
- L293D Dual H-Bridge motor driver
- Power source (I used two 18650 Lithium Ion Rechargeable Batteries)
- The Arduino IDE software (available for free at https://www.arduino.cc/en/Main/Software)
The rough prototype.
I put this together using an Arduino Pro-Mini and HC-05 Bluetooth module. An Arduino Nano would also work perfectly. I powered this using two Lithium Ion rechargeable batteries. I ran the hot lead to the RAW pin on the Arduino Pro-Mini. And the 5 volts for the Bluetooth module came from the VCC pin on the Arduino Pro-Mini. I am looking forward to cleaning it up as well as possibly including encoders on each wheel to solve the issue of one motor turning faster than the other, which causes the bot to veer off a straight line.
Motor with encoder wheel and two encoders.
You can see in the picture what an encoder looks like and also pictured is the encoder wheel you mount to your axle that spins inside the two protrusions on the encoder. Also you might notice the 0.1uF capacitor I soldered between the two terminals on the motor. That cuts down on theEMF emissions from the motor that can interfere with the radio signal.
Here’s a short video of the robot/car in action.
You can download everything you need and check out the project at: