Electronics Design — Wokwi Simulation

🧠 Learning Objectives

• Understand circuit design flow before physical prototyping.
• Use Wokwi to simulate microcontroller-based circuits.
• Verify wiring, component behavior, and code interaction in a virtual environment.

📌 Documentation Requirements (Checklist)

• Show the design process

  Explain circuit logic, components, and why they were selected.

• Include simulation evidence

  Add screenshots of the Wokwi project, wiring, and serial output or behavior.

• Document code and behavior

  Show how the program interacts with inputs and outputs.

• Provide links/files

  Share the Wokwi simulation link and source code if possible.

🛠️ Tools & Components

• Simulation Website: Wokwi
• Microcontroller: ESP32 / Arduino Uno / Raspberry Pi Pico (replace with your actual board)
• Components: LEDs, push buttons, resistors, buzzer, OLED, sensors, etc. (replace as needed)
• Programming: Arduino C/C++

🔌 Circuit Design

I started by selecting the components needed for the design and wiring them virtually in Wokwi. The circuit was designed to test interaction between the microcontroller and connected input/output devices.

• Power connections: VCC and GND wired correctly to all components.
• Inputs: Example: push button / sensor connected to GPIO pins.
• Outputs: Example: LED / buzzer / display connected to digital output pins.

🧪 Simulation Process

After wiring the circuit, I ran the simulation in Wokwi and tested whether the behavior matched the intended logic.

• Verified that the board powered on correctly.
• Tested input changes and observed output response.
• Checked serial monitor output for debugging messages.
• Adjusted wiring and code until the simulation worked as expected.

💻 Code

// Arduino code
const int ledPin = 2;
const int buttonPin = 4;

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);
  Serial.begin(115200);
}

void loop() {
  int state = digitalRead(buttonPin);

  if (state == LOW) {
    digitalWrite(ledPin, HIGH);
    Serial.println("Button pressed - LED ON");
  } else {
    digitalWrite(ledPin, LOW);
    Serial.println("Button released - LED OFF");
  }

  delay(200);
}

The code reads the input pin state and controls the LED output accordingly. I also used the serial monitor to confirm the behavior during simulation.

✅ Results

Replace the placeholders below with your actual screenshots and results.

⚠️ Issues & Fixes

• Wrong pin mapping: corrected GPIO assignment in code and wiring.
• Floating input: solved by using INPUT_PULLUP.
• No output response: fixed by checking component orientation and logic conditions.
• Serial not updating: confirmed baud rate and correct use of Serial.begin().

📦 Links & Files

Replace the placeholder links below with your actual Wokwi project and source files.

Reflection — What I Learned

• Wokwi is very useful for testing circuit ideas before building them physically.
• Simulating circuits helps catch wiring and code mistakes early.
• Using the serial monitor improves debugging and understanding of program flow.
• Documenting the design decisions makes it easier to reproduce the circuit later in real hardware.