[JAVA - Arduino] USB Hardware Connect and Function Run Example

 

🧩 Step-by-Step: Arduino USB Connect and Inject Function

1. Use a USB-Capable Arduino Board

• Recommended: Arduino Leonardo, Micro, or Due
• These boards use the ATmega32U4 or SAM3X8E chips which support native USB HID (Human Interface Device)

2. Connect Arduino via USB

• Plug your Arduino into your PC using a USB cable
• Open the Arduino IDE
• Go to Tools > Port and select the correct COM port
• Select your board under Tools > Board

3. Inject Data via USB (Serial or HID)

You can send data from your PC to Arduino using:

• Serial Monitor (text input)
• Custom software (e.g., Python script using pyserial)
• USB HID emulation (keyboard, mouse, joystick)

Example: Serial Injection

String input; void setup() { Serial.begin(9600); } void loop() { if (Serial.available()) { input = Serial.readStringUntil('\n'); if (input == "LED_ON") { digitalWrite(13, HIGH); } else if (input == "LED_OFF") { digitalWrite(13, LOW); } } }

Type LED_ON or LED_OFF in the Serial Monitor to control the onboard LED.

4. Run USB Functions (e.g., Emulate Keyboard or Mouse)

Example: Emulate a USB Keyboard

#include void setup() { Keyboard.begin(); delay(1000); Keyboard.print("Hello from Arduino!"); } void loop() { // Nothing here }

This sends keystrokes to the connected PC when the Arduino boots.

5. Connect to USB Hardware (Advanced)

If you want Arduino to control external USB devices (like a USB flash drive or printer), you’ll need:

• A USB Host Shield
• Libraries like USBHost or USB_Host_Shield_2.0
• Compatible board (e.g., Arduino Mega or Uno with shield)

Would you like help setting up a USB Host Shield or writing code to interact with a specific USB device like a flash drive or game controller?