Running Arduino C++ code online without owning an Arduino board.

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1️⃣ Tinkercad Circuits (Most beginner-friendly)

• Website: https://www.tinkercad.com/circuits

• How it works:

  • Create a free account.
  • Drag an Arduino Uno into the workspace.
  • Add components like LEDs, buttons, servos, or ultrasonic sensors.
  • Switch to the “Code” tab → choose “Text” mode.
  • Write your Arduino C++ code (setup() & loop()), then click Start Simulation.

• Good for: School robotics, servo motor control, ultrasonic sensor projects.

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2️⃣ Wokwi Arduino Simulator (Faster & More Realistic)

• Website: https://wokwi.com

• How it works:

  • Click Start Project → choose Arduino Uno.
  • Add components from the left panel.
  • Write your Arduino C++ code in the online editor.
  • Click the green Play button to run.

• Advantages:

  • Very fast simulation.
  • Works on mobile and PC.
  • Supports more hardware (ESP32, Arduino Nano, LCD displays).

• Good for: Trying more advanced projects beyond Tinkercad.

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3️⃣ Arduino Web Editor (Official)

• Website: https://create.arduino.cc/editor

• How it works:

  • Official Arduino online IDE.
  • You can write Arduino C++ and run it only if you have a real board connected — no virtual simulation.

• Good for: People who have the physical Arduino kit.

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⚡ Suggestion

• If you don’t need a physical board yet, start with Tinkercad Circuits for school robotics projects.
• It’s the easiest and already used in many CBSE/ICSE robotics classes.
• When you want faster simulation or more components, try Wokwi.

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Color-coded Arduino C++ command cheat sheet tailored for a robotics course in India.

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🎯 Arduino C++ Quick Reference — Robotics

1️⃣ Pin Setup

Command	Meaning	Example
pinMode(pin, OUTPUT);	Set a pin to send signals.	pinMode(13, OUTPUT);
pinMode(pin, INPUT);	Set a pin to receive signals.	pinMode(2, INPUT);
pinMode(pin, INPUT_PULLUP);	Input with internal resistor.	pinMode(2, INPUT_PULLUP);

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2️⃣ Digital I/O

Command	Meaning	Example
digitalWrite(pin, HIGH);	Send HIGH voltage (LED ON).	digitalWrite(13, HIGH);
digitalWrite(pin, LOW);	Send LOW voltage (LED OFF).	digitalWrite(13, LOW);
digitalRead(pin)	Read HIGH or LOW from pin.	if (digitalRead(2) == HIGH) { ... }

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3️⃣ Analog I/O

Command	Meaning	Example
analogRead(pin)	Read analog value (0–1023).	int sensor = analogRead(A0);
analogWrite(pin, value)	Output PWM (0–255).	analogWrite(9, 128);

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4️⃣ Time Control

Command	Meaning	Example
delay(ms);	Pause for ms milliseconds.	delay(1000); (1 sec)
delayMicroseconds(us);	Pause in microseconds.	delayMicroseconds(10);
millis()	Time since start in ms.	if (millis() > 5000) { ... }

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5️⃣ Servo Motor Control

Command	Meaning	Example
#include <Servo.h>	Include servo library.	Always at top
Servo name;	Create servo object.	Servo myservo;
.attach(pin);	Connect servo to pin.	myservo.attach(9);
.write(angle);	Move servo to angle 0–180°.	myservo.write(90);
.detach();	Stop servo signal.	myservo.detach();

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6️⃣ Ultrasonic Sensor (HC-SR04)

Command	Meaning	Example
digitalWrite(trigPin, LOW);	Clear trigger.
delayMicroseconds(2);	Wait 2 μs.
digitalWrite(trigPin, HIGH);	Send trigger pulse.
delayMicroseconds(10);	10 μs pulse.
duration = pulseIn(echoPin, HIGH);	Measure echo time.

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7️⃣ Serial Monitor

Command	Meaning	Example
Serial.begin(9600);	Start serial at 9600 baud.	In setup()
Serial.print(data);	Print without new line.	Serial.print("Value: ");
Serial.println(data);	Print with new line.	Serial.println(value);

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📌 Color tips for notes:

• Blue → Setup & Library commands
• Green → Output commands
• Orange → Input commands
• Purple → Timing commands

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If you want, I can also make this as a single colorful PNG sheet so you can print and keep in your robotics notebook — all commands in one page with colors exactly like above. Do you want me to prepare that image?