Bluetooth Controlled Toy Car using Arduino
Following the development of a few popular robotic projects like line following robots, edge avoiding robots, DTMF robots, gesture-controlled robots, etc. This project involves developing…
Know the mission before touching a wire.
Understand what you are making, prepare the right tools, and make the workbench safe.
Project details
Bluetooth Controlled Toy Car using Arduino is a arduino project. Following the development of a few popular robotic projects like line following robots, edge avoiding robots, DTMF robots, gesture-controlled robots, etc. This project involves developing…
- Source pages
- 785-789
- Named parts
- 5
- Build goal
- Working, tested prototype
Tools you need
- Digital multimeter
- Wire stripper and side cutters
- Soldering iron with a fine tip
- Current-limited bench supply
- Computer with a data-capable USB cable
Use eye protection, good lighting, and a clean insulated surface throughout the build.
Safety precautions
- Disconnect every power source before changing a connection.
- Check component polarity, pinout, and supply voltage twice.
- Use a current limit for the first power-up.
- Keep liquids, loose metal, and uninsulated wires away from the bench.
Gather, identify, and understand every part.
Use the standardized inventory, then open What's this? to learn each part's role, advantages, limitations, handling, and specifications.
What's this?Image, role, pros, cons, handling & specifications
Arduino UNO, DC Motors
A programmable controller that reads inputs, makes decisions, and drives the project's outputs.
What it does hereIt is the control centre and must use the documented board, pin map, supply, and logic level.
Buy / compare this part ↗Advantages
- Reprogrammable and reusable
- Large learning ecosystem
- Complex behaviour remains changeable
Limitations
- GPIO voltage and current are limited
- Some pins affect boot or communication
- Loads normally need a driver
Handling
- Disconnect power before rewiring
- Avoid static discharge
- Never power motors, relays, or pumps directly from GPIO
Specifications to verify
- Use the exact model, value, package, and rating listed for Arduino UNO, DC Motors; similar-looking parts are not always interchangeable.
- Confirm operating voltage, logic level, pinout, memory, USB interface, and maximum GPIO current.
What's this?Image, role, pros, cons, handling & specifications
Bluetooth module HC-05
A named project component whose exact role is defined by the source circuit and build guide.
What it does hereIt performs a documented electrical, control, interface, or construction function in this project.
Buy / compare this part ↗Advantages
- Selected for this project
- Can be checked independently
- Supports modular troubleshooting
Limitations
- Substitutes may differ
- Generic names can hide variants
- Pinouts and ratings vary
Handling
- Compare the received part with the source
- Keep it labelled
- Do not force connectors or adjusters
Specifications to verify
- Use the exact model, value, package, and rating listed for Bluetooth module HC-05; similar-looking parts are not always interchangeable.
- Confirm dimensions, ratings, connection method, polarity, and environmental limits.
What's this?Image, role, pros, cons, handling & specifications
Motor Driver L293D
An output component turns an electrical control signal into light, sound, motion, switching, or displayed information.
What it does hereIt presents the circuit result or acts on the physical world.
Buy / compare this part ↗Advantages
- Makes system state visible
- Can be tested separately
- Supports clear troubleshooting
Limitations
- Loads may exceed controller current
- Polarity or driver direction can matter
- Inductive loads create voltage spikes
Handling
- Use the documented driver stage
- Check polarity and load current
- Add flyback protection for inductive loads
Specifications to verify
- Use the exact model, value, package, and rating listed for Motor Driver L293D; similar-looking parts are not always interchangeable.
- Confirm voltage, current, polarity, interface, driver requirements, and duty cycle.
What's this?Image, role, pros, cons, handling & specifications
Volt Battery and 6-volt battery
A power component supplies, converts, stores, or regulates energy for the project.
What it does hereIt must provide the documented voltage, polarity, isolation, and sufficient current safely.
Buy / compare this part ↗Advantages
- Stable power improves reliability
- Current limiting protects first tests
- Regulation reduces resets and noise
Limitations
- Wrong polarity can cause immediate damage
- Underrated parts overheat
- Mains circuits require qualified supervision
Handling
- Measure output before connection
- Use a fuse or current limit
- Insulate exposed conductors
Specifications to verify
- Use the exact model, value, package, and rating listed for Volt Battery and 6-volt battery; similar-looking parts are not always interchangeable.
- Confirm input/output voltage, current, polarity, connector, isolation, and thermal rating.
What's this?Image, role, pros, cons, handling & specifications
Battery Connector, Toy Car
A power component supplies, converts, stores, or regulates energy for the project.
What it does hereIt must provide the documented voltage, polarity, isolation, and sufficient current safely.
Buy / compare this part ↗Advantages
- Stable power improves reliability
- Current limiting protects first tests
- Regulation reduces resets and noise
Limitations
- Wrong polarity can cause immediate damage
- Underrated parts overheat
- Mains circuits require qualified supervision
Handling
- Measure output before connection
- Use a fuse or current limit
- Insulate exposed conductors
Specifications to verify
- Use the exact model, value, package, and rating listed for Battery Connector, Toy Car; similar-looking parts are not always interchangeable.
- Confirm input/output voltage, current, polarity, connector, isolation, and thermal rating.
Connect one verified path at a time.
Explore the named components and standardized signal flow, then use Source Check to verify exact physical pins, values, and topology before applying power.
Trace this circuit.
Bluetooth Controlled Toy Car using Arduino: interactive parts, standardized terminals, responsive anchored wires, student explanations, and the original circuit reference in one shared system.
Trace before wiring
Follow power, ground, inputs, processing, and outputs in that order. Never guess a pin from package shape alone.
Connect with power off
Make short, labelled connections and share a common ground only where the schematic requires it.
Inspect every joint
Check continuity, polarity, adjacent shorts, and loose connections before the first power-up.
Open all source diagrams and build views 4 visuals
Confirm the hardware-only control path.
This project does not include firmware in the source. The circuit itself provides the required behaviour.
How to connect
- Match every controller label to the circuit view and source pin map.
- Join grounds before signal wires when separate low-voltage supplies are used.
- Keep motors, relays, pumps, and other loads on a suitable driver and external supply.
Common mistakes
Reversed VCC/GND, board-label versus GPIO-number confusion, missing common ground, and charge-only USB cables.
Troubleshoot
Disconnect loads, continuity-test one path at a time, then test with a current limit.
Software preparation
No IDE, board package, library, or firmware upload is required for this project.
If you add a programmable controller as an extension, document its pin map separately.
How to upload code
The original design is implemented entirely in hardware, so proceed after verifying the circuit and supply.
Assemble, deploy, test, and troubleshoot.
Use the complete source notes in build order, then pass the final checks before calling the project finished.
Build in functional stages
- Power and regulation
- Controller or processing stage
- Inputs and sensors
- Outputs and loads
- Enclosure and strain relief
Power up safely
- Inspect unpowered continuity first
- Apply the lowest safe current limit
- Measure supply rails before signals
- Add one load at a time
- Record expected and actual results
Work from simple to complex
- Confirm power, ground, polarity, and orientation
- Compare each pin with the source
- Test inputs separately from outputs
- Replace only one variable at a time
- Power off before every correction
Follow the documented instructions.
These notes come from this project's source and remain in their original order.
Project overview
Project build noteFollowing the development of a few popular robotic projects like line following robots, edge avoiding robots, DTMF robots, gesture-controlled robots, etc. This project involves developing an Android-based application that uses Bluetooth technology to control a robot car.
Components Required
Project build noteArduino UNO, DC Motors Bluetooth module HC-05 Motor Driver L293D 9 Volt Battery and 6-volt battery Battery Connector, Toy Car
Android-based mobile devices can control Bluetooth-enabled cars instead of buttons, gestures, and other traditional control methods. In this case, I could control the car with an Android phone by simply touching buttons forward, backward or left and right. Here, the Android phone transmits data to the car's Bluetooth module, which acts as the receiver. In order to move in the required direction like forward and reverse, turning left and right, and stopping, an Android phone will transmit commands via Bluetooth to the car.
Working Explanation
Project build noteA toy car was used in this project to demonstrate the process. This RF toy car has steering features that can be moved left and right. This car's RF circuit was replaced by an Arduino circuit we purchased after buying it. Both the front and rear of this car are equipped with DC motors. An engine on the front of the car gives the car direction, such as turning left or right. Rear-wheel drive energy is used to propel the car forwards and backwards. The Arduino UNO is used to control the entire system, with Bluetooth modules receiving directions from Android phones.
In the Bluetooth mobile application for Android, the car is driven by buttons touched. Getting started with this project requires first downloading Bluetooth apps from Google Play. The apps that should work correctly include any that support or can send data. These are some examples. § Bluetooth Spp pro § Bluetooth controller It is necessary to open the app once it is installed and then search for the Bluetooth device and choose it. Using the Bluetooth controller app, we have set up the keys. Download the Bluetooth Controller and install it.
1. Turned ON mobile Bluetooth. 2. Now open Bluetooth controller app 3. Press scan 4. Select desired Bluetooth device Press the set buttons on the screen to set the keys. Keys can be set by pressing the “Set” button and setting them according to the following image: Press OK after you have set the keys. The Bluetooth controller app starts moving forward when we touch the forward button, and the car keeps moving forward until we hit the next command. The car moves backward when we touch the backward button in the Bluetooth controller app and continues to move backward until the next command is given. In the app, we can tap the left button to cause the car to move in the left direction. In addition, it continues moving left until the next command is given. When the front motors are operating in this condition, the tires will turn in the left direction, whereas the rear motors will run in the forward direction. If we touch the right button on the Bluetooth controller app, the car will start moving in the right direction and it will continue to move until the next command is received. Under this condition, the motors on the front side move the wheels in the right direction, while the motors on the back move the vehicle forward. We can stop the car by touching the stop button.
A Bluetooth-controlled car circuit diagram is shown in the above figure. To drive the car, a motor driver is connected to Arduino. Arduino's digital pin numbers 12, 11, 10 and 9 correspond to the motor driver's input pins 2, 7 and 15. This circuit uses two DC motors and a 6-volt battery to power the motors. One motor is connected to the output pins 3 and 6 of the motor driver, while the other motor is connected to pins 11 and 14. RX and TX pins of the Bluetooth module are connected directly to the TX and Rx of the Arduino. The Bluetooth module's VCC and GND pins are connected to Arduino's +5 volt and GND. An Arduino's Vin pins are powered by a 9V battery.
You built Bluetooth Controlled Toy Car using Arduino.
You followed the full workflow from understanding the mission to testing the finished project. That is a real engineering achievement - well done.
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