Ultrasonic Intelligent Bluetooth Robot Car Kit

The Ultrasonic Intelligent Bluetooth Robot Car Kit is a comprehensive DIY robotics platform that combines HC-SR04 ultrasonic distance sensing with Bluetooth wireless control for autonomous obstacle avoidance and remote operation capabilities. Robotics educators, embedded systems engineers, and hobbyists use this kit to develop practical skills in sensor integration, motor control, and real-time obstacle detection algorithms. This kit solves the challenge of learning robotics fundamentals with a hands-on, affordable platform that demonstrates core principles of autonomous navigation and wireless communication protocols.

Product Overview

The Ultrasonic Intelligent Bluetooth Robot Car Kit operates on a dual-control architecture combining autonomous mode and Bluetooth-controlled mode. The HC-SR04 ultrasonic sensor continuously emits 40kHz sound waves and measures the echo return time to calculate real-time distance to obstacles with accuracy up to 2-400cm. The microcontroller processes sensor data at 50-100Hz sampling frequency and makes instantaneous decisions to steer the robot away from obstacles while maintaining forward momentum. The dual DC motors drive the chassis with adjustable PWM speed control, enabling smooth acceleration and directional changes. Bluetooth module (HC-05 or HC-06) communicates with mobile devices over 2.4GHz ISM band with effective range of 10-100 meters depending on environmental interference.

This model stands out through its integrated sensor fusion approach, combining ultrasonic detection with motor feedback for stable autonomous navigation. The modular design allows students to upgrade components independently, swap sensors, or implement custom control algorithms on the microcontroller. The kit includes pre-soldered motor driver modules (L298N or similar) rated for 2A continuous current, eliminating complex circuit design while maintaining educational value. The chassis is constructed from lightweight plastic with shock-absorbing wheel mounts, and the power distribution system uses standard 18650 lithium batteries with protection circuitry, ensuring reliable 4-6 hour runtime under typical operation.

Key Specifications

Specification	Details
Product Type	DIY Ultrasonic Bluetooth Robot Car Kit with Autonomous Navigation
Brand	Generic Educational Grade
Origin	Original/Authentic
Warranty	7 days on manufacturing defects
Shipping	1-5 days from Bengaluru
Delivery	7-8 days across India
Support	24/7 via Email and WhatsApp
Microcontroller	Arduino UNO/Nano compatible (ATmega328P)
Ultrasonic Sensor	HC-SR04 with 40kHz frequency, 2-400cm range
Bluetooth Module	HC-05/HC-06 with 2.4GHz ISM band, 10-100m range
Motor Driver	L298N dual H-bridge, 2A continuous current per channel
Motors	Dual 3-6V DC motors with 65-100 RPM output
Power Supply	2x 18650 lithium batteries, 7.4V nominal output
Operating Time	4-6 hours continuous operation
Chassis Material	Lightweight plastic with aluminum reinforcement
Wheel Type	Rubber tires with shock-absorbing suspension
Weight	Approximately 500-600 grams assembled
Dimensions	170mm L x 140mm W x 100mm H

Key Features

• Dual-Mode Operation: Autonomous obstacle avoidance using real-time ultrasonic sensor feedback with 50-100Hz refresh rate, plus manual Bluetooth control via Android/iOS mobile applications
• HC-SR04 Ultrasonic Sensing: Accurate distance measurement from 2-400cm with 0.3cm resolution, enabling precise obstacle detection and collision prevention algorithms
• Bluetooth Wireless Control: HC-05/HC-06 module with 10-100 meter effective range for remote operation and live sensor data streaming to mobile devices
• PWM Speed Control: Adjustable motor speed from 0-255 levels using 490Hz PWM frequency, allowing smooth acceleration curves and precise directional control
• Pre-assembled Motor Driver: L298N dual H-bridge rated for 2A continuous current, eliminating soldering complexity while maintaining full educational value
• Extended Runtime: Dual 18650 lithium battery configuration with protection circuitry provides 4-6 hours of continuous operation under typical load conditions
• Modular Design: Component-based architecture allows sensor upgrades, algorithm modifications, and integration of additional modules like line-following sensors or temperature probes
• Arduino-Compatible Microcontroller: ATmega328P processor with 32KB flash memory and 2KB SRAM for custom programming using Arduino IDE and C/C++ firmware development

Applications and Use Cases

• Educational Robotics Curriculum: Ideal for engineering colleges and polytechnics teaching embedded systems, sensor integration, and autonomous navigation principles with hands-on experimentation
• Autonomous Robot Development: Platform for prototyping obstacle avoidance algorithms, testing sensor fusion techniques, and developing real-time control logic before deployment on larger systems
• STEM Outreach Programs: Engaging demonstration tool for school science fairs, robotics clubs, and maker spaces to introduce students to microcontroller programming and robotics fundamentals
• IoT and Smart Systems Projects: Integration point for IoT applications where the robot transmits sensor data to cloud platforms, enabling remote monitoring and data-driven decision-making systems
• Research and Development: Testbed for algorithm validation in mobile robotics, machine learning model training on sensor datasets, and development of advanced navigation strategies
• Competitive Robotics: Foundation platform for robot soccer competitions, maze-solving challenges, and autonomous navigation contests requiring real-time obstacle detection

How to Use

Begin by assembling the chassis components according to the provided diagram, ensuring motor shafts are properly aligned and wheels rotate freely without binding. Connect the HC-SR04 ultrasonic sensor to the microcontroller's digital pins (typically pins 8 and 9 for trigger and echo respectively), and attach the HC-05 Bluetooth module to the serial communication pins (RX/TX at 9600 baud rate). Load the pre-compiled firmware onto the Arduino microcontroller using the USB programming cable, or upload custom code through the Arduino IDE if you wish to modify sensor thresholds or motor response characteristics. Insert two fully charged 18650 batteries into the battery holder, ensuring correct polarity alignment, and power on the robot using the main switch.

For autonomous operation, simply place the robot on the ground and it will begin detecting obstacles and navigating around them automatically. The ultrasonic sensor continuously scans for objects within 30cm range, triggering motor direction changes when obstacles are detected. For Bluetooth control mode, download the compatible mobile app on your smartphone, scan and connect to the HC-05 module (default PIN is typically 1234), and use the on-screen directional controls to command the robot. Monitor real-time sensor readings through the app's data display feature to verify distance measurements and motor response timing. Regularly calibrate the ultrasonic sensor by testing it against known distances (10cm, 20cm, 30cm) to ensure measurement accuracy, and recalibrate if you notice inconsistent obstacle detection behavior.

Frequently Asked Questions

How does the HC-SR04 ultrasonic sensor measure distance accurately?

The HC-SR04 works by sending a 40kHz ultrasonic pulse and measuring the time delay until the echo returns from an obstacle. The microcontroller calculates distance using the formula: Distance = (Echo Time × Speed of Sound) / 2. The speed of sound is approximately 343 meters per second at room temperature. The sensor achieves 0.3cm resolution by measuring echo time in microseconds. Environmental factors like temperature and humidity can slightly affect accuracy, so recalibration against known distances is recommended for precision applications.

Can I modify the obstacle detection threshold and motor response time?

Yes, the microcontroller firmware is fully programmable through the Arduino IDE. You can adjust the distance threshold variable (typically 20-30cm default) to make the robot more or less sensitive to obstacles. Motor response time can be modified by changing the PWM duty cycle values and direction change delays in the code. Advanced users can implement proportional control where motor speed decreases gradually as obstacles approach, rather than simple on-off obstacle avoidance. We provide sample code and documentation to guide firmware customization.

What is the effective Bluetooth range and can it be extended?

The HC-05 module provides 10-100 meter effective range depending on environmental interference and antenna orientation. Walls, metal objects, and other wireless devices operating on the 2.4GHz band can reduce range significantly. Range can be extended by upgrading to external antenna modules or using high-gain Bluetooth modules rated for 200+ meters. For most educational applications, the standard 50-meter range is sufficient. Ensure your mobile device's Bluetooth is set to maximum power output for optimal connectivity.

How long does the battery last and how do I optimize runtime?

The dual 18650 lithium battery configuration provides 4-6 hours of continuous operation under typical conditions. Runtime depends on motor load, PWM speed settings, and Bluetooth transmission frequency. To optimize runtime, reduce PWM speed when maximum power is not needed, minimize Bluetooth data transmission rate, and keep the robot on flat surfaces to reduce motor strain. Use high-capacity 18650 batteries (3000mAh or higher) for extended operation. Always charge batteries using a dedicated lithium charger with protection circuitry to prevent over-discharge and extend battery lifespan.

When will I receive my order?

Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.

What is your return and warranty policy?

We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.

Are bulk discounts available?

Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.

Why Buy from The Engineer Store

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• Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
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