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