Line Follower Robot
An autonomous robot that tracks a taped line using an infrared sensor array and proportional steering correction.
- Suitable for
- School
- Technology
- Arduino Nano
Intermediate5–6 days
Robotics · Autonomous Robots
Obstacle Avoiding Robot
A robot that scans ahead with a servo-mounted ultrasonic sensor and steers around whatever it finds.
- Difficulty
- Beginner
- Typical time
- 4–6 days
- Suitable for
- School
Price
Contact for price
Cost depends on components, complexity and which deliverables you need, so we quote after understanding your requirement.
Technologies
- Arduino Uno
- HC-SR04 ultrasonic ranging
- Servo scanning
- L298N motor driver
Project overview
An ultrasonic sensor mounted on a servo sweeps across the robot's path. When an obstacle appears inside the stop distance, the robot halts, looks left and right, compares the two clearances and turns towards the larger one before continuing.
The scanning approach is what makes this project worth building rather than a fixed forward-facing sensor. It gives the robot a genuine decision to make, and it gives you something to talk about: why the robot reverses slightly before turning, and what it does when both directions are blocked.
The behaviour is deliberately conservative — it prefers stopping to guessing — which makes it reliable to demonstrate on an unfamiliar floor.
Features
- Servo-mounted sensor that scans left and right before deciding
- Adjustable stop distance
- Reverse-then-turn behaviour so the robot does not scrape obstacles
- Halts safely when both directions are blocked
- Runs untethered from a battery pack
How it works
- 1The sensor faces forward while the robot drives and measures distance continuously.
- 2If a reading falls below the stop distance, the motors halt.
- 3The servo rotates the sensor to the left, takes a reading, then to the right and takes another.
- 4The robot reverses briefly and turns towards whichever side reported more clearance.
- 5If neither side is clear, the robot stops and signals rather than continuing blindly.
Components used
- Arduino Uno
- HC-SR04 ultrasonic sensor
- SG90 servo for sensor scanning
- L298N motor driver
- Two geared motors with wheels
- Chassis and battery pack
Questions about this project
What is the detection range?
The ultrasonic sensor is reliable from roughly 3 cm to 2 m. The stop distance is normally set around 20–25 cm and is adjustable in the sketch.
Does it detect glass or very thin objects?
Ultrasonic sensing struggles with angled glass and thin table legs because the echo scatters away. That limitation is worth stating in your report — examiners appreciate it being acknowledged.
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Need the Obstacle Avoiding Robot in Surat?
Send your class or course and your submission date and we'll confirm what's achievable, what it includes and what it costs — before you commit.