114 lines
3.3 KiB
Markdown
114 lines
3.3 KiB
Markdown
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# Components Reference
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Velxio ships with **48+ interactive electronic components** powered by [wokwi-elements](https://github.com/wokwi/wokwi-elements). All components can be placed on the simulation canvas, connected with wires, and interact with your Arduino sketch in real time.
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---
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## Adding Components
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1. Click the **+** button on the simulation canvas.
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2. Use **search** or browse by **category** in the component picker.
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3. Click a component to place it on the canvas.
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4. **Drag** to reposition; click to open the **Property Dialog** (pin roles, Arduino pin assignment, rotate, delete).
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---
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## Connecting Components
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1. Click a **pin** on any component — a wire starts from that pin.
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2. Click a **destination pin** to complete the connection.
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3. Wires are **color-coded** by signal type:
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| Color | Signal type |
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|-------|-------------|
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| 🔴 Red | VCC (power) |
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| ⚫ Black | GND (ground) |
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| 🔵 Blue | Analog |
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| 🟢 Green | Digital |
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| 🟣 Purple | PWM |
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| 🟡 Gold | I2C (SDA/SCL) |
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| 🟠 Orange | SPI (MOSI/MISO/SCK) |
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| 🩵 Cyan | USART (TX/RX) |
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---
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## Component Categories
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### Output
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| Component | Description |
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|-----------|-------------|
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| LED | Single LED with configurable color |
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| RGB LED | Three-color LED (red, green, blue channels) |
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| 7-Segment Display | Single digit numeric display |
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| LCD 16×2 | 2-line character LCD (I2C or parallel) |
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| LCD 20×4 | 4-line character LCD |
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| ILI9341 TFT | 240×320 color TFT display (SPI) |
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| Buzzer | Passive piezo buzzer |
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| NeoPixel | Individually addressable RGB LED strip |
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### Input
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| Component | Description |
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|-----------|-------------|
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| Push Button | Momentary push button |
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| Slide Switch | SPDT slide switch |
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| Potentiometer | Analog voltage divider (ADC input) |
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| Rotary Encoder | Incremental rotary encoder |
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| Keypad 4×4 | 16-button matrix keypad |
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| Joystick | Dual-axis analog joystick |
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### Sensors
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| Component | Description |
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|-----------|-------------|
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| HC-SR04 | Ultrasonic distance sensor |
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| DHT22 | Temperature and humidity sensor |
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| PIR Motion | Passive infrared motion sensor |
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| NTC Thermistor | Analog temperature sensor |
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| Photoresistor | Light-dependent resistor (LDR) |
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| IR Receiver | 38 kHz infrared receiver |
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### Passive Components
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| Component | Description |
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|-----------|-------------|
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| Resistor | Standard resistor (configurable value) |
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| Capacitor | Electrolytic capacitor |
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| Inductor | Coil inductor |
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### Communication
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| Component | Description |
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|-----------|-------------|
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| I2C EEPROM | 24Cxx series EEPROM (I2C) |
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| SPI Flash | 25-series SPI NOR flash |
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| RFID (RC522) | SPI RFID reader/writer |
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### Power & Connectors
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| Component | Description |
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|-----------|-------------|
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| Power Rail | VCC / GND bus bar |
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| Terminal Block | 2-pin screw terminal |
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---
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## Component Properties
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Each component has a **Property Dialog** accessible by clicking it on the canvas:
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| Property | Description |
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|----------|-------------|
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| Arduino Pin | The digital or analog pin this component is connected to |
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| Color | Visual color (LEDs, wires) |
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| Value | Component value (e.g., resistance in Ω) |
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| Rotation | Rotate in 90° increments |
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| Delete | Remove the component from the canvas |
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---
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## Adding Custom Components
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See [Architecture: Component System](./emulator.md#component-system) for details on registering new wokwi-elements components in the simulation.
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