Aim

To simulate a smart bulb or fan using an IoT dashboard.

Requirements

• Computer with internet access

• Tinkercad Circuits (online simulation tool) or Blynk app

• Arduino Uno (in simulation)

• LED (acts as a smart bulb) or small motor (acts as fan)

Steps

Step 1: Open IoT Simulation Tool

• If using Tinkercad: Log in to Tinkercad Circuits.

• If using Blynk: Install the Blynk app on a smartphone.

Step 2: Build the Circuit

• Place an Arduino Uno in Tinkercad workspace.

• Connect an LED (for smart bulb) or DC motor (for fan).

• Attach a resistor to the LED to avoid burning it out.

• Connect wires:

  • LED positive → Arduino digital pin (e.g., pin 9).

  • LED negative → Resistor → GND.

  • Fan positive → Arduino digital pin.

  • Fan negative → GND.

Step 3: Add IoT Dashboard (Button Control)

• In Tinkercad, use the Code Blocks or text editor.

• Write a program to control the LED/fan using HIGH (ON) and LOW (OFF) signals.

• In Blynk, create a button widget in the dashboard and link it to the Arduino pin.

Step 4: Run the Simulation

• Click Start Simulation in Tinkercad OR tap the button in Blynk app.

• When the button is pressed → LED/fan turns ON.

• When the button is pressed again → LED/fan turns OFF.

Step 5: Observe and Reflect

• Notice how the device does not need manual switches.

The device “listens” to commands sent via the internet.