The USB-HID Library is built into Arduino, there is no external installation required. Verify that you have a Metro Express, then copy and paste the code below into the Arduino Editor. Then, compile and upload.
/*
* USB Blog Buddy
* a USB-HID Scroll Wheel for Metro Express
*
* by Brent Rubell for Adafruit Industries. Support Open Source, buy Adafruit!
*/
// include the mouse library
#include <Mouse.h>
// trimpot pin
const int trimPin = A0;
// button pin
const int buttonPin = 2;
// reduces scrolling speed (ms)
const int scrollDelay = 100;
// trimpot value
int trimValue = 0;
// button state
int buttonState = 0;
void setup() {
// start serial monitor at 9600 baud
Serial.begin(9600);
// start the mouse
Mouse.begin();
}
void loop() {
// read the button state
buttonState = digitalRead(buttonPin);
if (buttonState == HIGH) {
// stop the mouse if button not pressed
Mouse.end();
}
else {
// start the mouse (if stopped)
Mouse.begin();
// read the trimpot value
trimValue = analogRead(trimPin);
// map the trimValues to scroll wheel down (-neg values) and up (+pos values)
trimValue = map(trimValue, 0, 1023, -5, 5);
// move the mouse wheel (dont change cursor position)
Mouse.move(0, 0, trimValue);
// reduce the scrolling speed
delay(scrollDelay);
}
}
When you press the push button, the Metro Express will take control of your mouse and start scrolling the mouse wheel.
Scroll Page Up: Move the potentiometer such that the arrow on it faces towards the top of the breadboard
Scroll Page Down: Move the potentiometer such that the arrow on it faces towards the bottom of the breadboard
I don't see anything moving on my screen
Check your wiring, the library for USB interfacing is built into Arduino and should automatically start when you upload this code.
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