SOLAR RC CAR
-By Nand Patliya and Rishabh Patel
Introduction
Our project focuses on building a solar + battery-powered RC car with Bluetooth control, combining renewable energy
with modern wireless technology. This system demonstrates the integration of clean energy solutions into small-scale
transportation. Such projects are not only educational but also contribute to the development of eco-friendly mobility
options.
About the Bluetooth Controlled Car
•Control Method: Operated wirelessly via Bluetooth (HC-05 module) using a smartphone.
•Brain: Arduino Uno microcontroller processes commands and controls the motors.
•Movement: Dual DC motors connected through an L298N motor driver allow forward, backward, left, and right motion.
•Power Supply: Runs on rechargeable battery; can integrate solar charging.
•Build Materials: Lightweight chassis for better speed and efficiency.
•Customization: Can be upgraded with sensors, a camera, or autopilot features for obstacle detection.
•Speed Control: Adjustable speed using PWM signals from Arduino.
Components Used :-
1.Arduino Uno – Microcontroller for processing Bluetooth commands and controlling motors.
2.HC-05 Bluetooth Module – Enables wireless communication between smartphone and Arduino.
3.L298N Motor Driver – Controls speed and direction of DC motors.
4.DC Motors (x4) – Provide movement to the car wheels.
5.Rechargeable Battery Pack – Powers motors and Arduino.
6.Solar Panel – Charges the battery in sunlight to extend usage time.
7.Wheels & Chassis – Mechanical support and mobility for the car.
8.Connecting Wires – Electrical connections between all components.
9.Smartphone with Control App – User interface to send commands.
Working Principle
The RC car operates using a DC motor driver controlled by
an Arduino Uno, which receives wireless commands via an
HC-05 Bluetooth module from a smartphone app. The
motors are powered by a rechargeable battery, and a solar
panel assists in charging the battery, reducing dependency
on external charging.
Process Flow
1.Command Transmission – Smartphone sends directional
and speed commands over Bluetooth.
2.Signal Processing – Arduino receives and interprets the
commands.
3.Motor Control – The motor driver regulates the speed
and direction of the motors.
4.Power Supply – Battery supplies energy to motors; solar
panel charges the battery when sunlight is available.
Key Features
•Wireless operation with smartphone control.
•Dual power supply: Solar + Battery for extended runtime.
•Modular design for easy upgrades.
Circuit Diagram & Working Flowchart
Circuit Connections:
•HC-05 Bluetooth Module: TX → Arduino pin 10, RX → Arduino pin 11, VCC
→ 5V, GND → GND.
•Motor Driver (L298N):
• ENA → Pin 3 (PWM), IN1 → Pin 5, IN2 → Pin 6.
• ENB → Pin 9 (PWM), IN3 → Pin 10, IN4 → Pin 11.
• Motor A → Left motor, Motor B → Right motor.
• Motor power input → Battery/Solar supply.
•Battery Pack/Solar Panel: Powers motors and Arduino.
Working Flow:
1.Smartphone sends command via Bluetooth.
2.HC-05 receives signal and sends it to Arduino.
3.Arduino processes command and sets motor speed/direction.
4.Motor Driver activates motors according to received instructions.
5.Car moves forward, backward, turns, or stops.
