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Class 4 · Ages 9–10 · ⚡ Elementary+

Class 4
⚡ Arduino & Robotics

Build line-following robots and explore sensors! Hands-on projects, simulators, and challenges aligned with NCERT and IB curriculum.

Class 4
Ages 9–10
NCERT Aligned
IB Framework
6 Modules
4 Projects
📚 Class 4 Modules

What You'll Learn

6 comprehensive modules covering everything from theory to hands-on projects!

🤖
Line Follower Robot
Build a robot that follows a black line using two IR sensors and dual motor drive. Understand PID control basics. Race your robot against classmates!
IR SensorDC MotorL298NAutonomy
📡
Ultrasonic Obstacle Avoidance
Add an HC-SR04 ultrasonic sensor to your robot to detect obstacles. Programme the decision: if obstacle < 20cm, turn! Your first autonomous navigation!
HC-SR04DistanceDecision Tree
🐍
Python — First Steps
Open IDLE (Python) for the first time! Learn print(), variables, input(), and simple if/else. Write programs that respond to user input. Python feels like writing English!
PythonVariablesprint()input()
🎛️
LCD Display & Servo Motor
Connect a 16x2 LCD to show messages on your robot. Control a servo motor with precision (0°–180°). Use a potentiometer to control servo position in real time!
LCDServoPotentiometerI2C
🔊
Sound & Music with Arduino
Make tones with a piezo buzzer. Play 'Happy Birthday' and 'Star Wars' in code! Understand frequency and pitch. Create a musical instrument with a potentiometer!
Buzzertone()FrequenciesMusic
🌐
TinkerCAD — Full Circuit Design
Design and simulate complete Arduino projects in TinkerCAD: line follower, obstacle avoider, and your own invention. Share and get feedback from classmates!
TinkerCADSimulationDesignShare
⚡ Interactive Labs

Try It Right Now!

8 interactive simulators — code editor, robot sim, circuit lab, quiz, binary game, AI pattern, sequences, and sorting!

🖥️ Remesys Interactive Lab — Class 4

class4_code.py
▶ Click "Run Code" to see output!
Ready
🕹️ CONTROLS
📡 LIVE SENSORS
🔊 Ultrasonic --
🌡️ Temperature 28°C
💡 Light (LDR) --
🔋 Battery 85%
Select a component above, then click on the canvas to place it!
Score: 0
Q: 1/5
Level: Beginner 🌱

Convert the decimal number to binary! Score streak points!

Convert this number to binary:

Score: 0 | Best: 0
2⁷
128
2⁶
64
2⁵
32
2⁴
16
2³
8
2²
4
2¹
2
2⁰
1

Draw a pattern, teach the AI, then draw a similar one and see if it recognises it!

Spot the number pattern and type the next number — just like AI sequence prediction!

Drag each item into the correct bin — just like an AI sorting algorithm!

🍎 FRUIT
🚗 VEHICLE
🐶 ANIMAL
Correct: 0 | Wrong: 0
🔨 Build & Create

Class 4 Projects

Real hands-on projects you'll build during the year!

🤖
⚡ Medium
Line Follower Robot
Build a complete line-following robot with IR sensors, motors, and motor driver!
⏱️ 6 hrs
🚗
⚡ Medium
Obstacle Avoiding Car
Autonomous car that stops and turns when it detects an obstacle using ultrasonic sensor.
⏱️ 5 hrs
🎵
🌱 Easy
Arduino Piano
Create a 7-note piano using 7 buttons and a buzzer — plays real musical notes!
⏱️ 2 hrs
🦾
🌱 Easy
Servo Arm Basics
Single servo arm controlled by a potentiometer — practice for the full robotic arm!
⏱️ 2 hrs
📅 Annual Schedule

Class 4 Roadmap

2 classes per week, quarterly projects, and the Annual Innovation Showcase

4

Class 4 — Full Year Schedule

40 weeks · 2 classes/week · 80 sessions

Wk 1–4Line Follower Robot — build and program
Wk 5–6Ultrasonic sensor — obstacle detection
Wk 7–8Python intro — variables, print, input
Wk 9–10Q1 Project — Line Follower Robot 🤖
Wk 11–12LCD display + Servo motor control
Wk 13–14Arduino Piano — buzzer music
Wk 15–16TinkerCAD circuit design
Wk 17–18Obstacle-avoiding car
Wk 19–20Q2 Project — Autonomous Car 🚗
Wk 21–28Python loops, functions, simple programs
Wk 29–40Annual Showcase — My Smart Gadget 🏆
❓ Class 4 FAQ

Common Questions

What kind of robots are built in Class 4? ▼
Students build a line-following robot and an obstacle-avoiding car — two classic autonomous robot designs using IR and ultrasonic sensors!
Is Python introduced in Class 4? ▼
Yes! Python begins in Class 4 with simple variables, print, and input. Full Python programming deepens in Class 5.
How does the quarterly project work? ▼
Every 10 weeks, students complete a major project. They design, build, test and present it to the class. Feedback is given by teachers and peers. This mirrors real engineering and design-thinking workflows!
Can I use this simulator to practise at home? ▼
Yes! The simulators on this page work in any modern browser — no installation needed. Students can practise coding, circuit design, and robot control from home anytime!
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