bouton-clic-souris.ino
The button acts like a mouse micro-switch: Mouse.click sends the left-click press/release. Handy for a presentation clicker or a physical panic button.
Hardware required
An Arduino Micro (ATmega32U4, 16 MHz, 5 V) in a breadboard-friendly format with a micro-USB connector and native USB (keyboard/mouse). 1 push button.
Wiring
Button between pin 2 and GND (internal pull-up).
How it works
The two-state machine prevents double clicks; Mouse.click(MOUSE_LEFT) emits the full HID event. In the Arduino IDE, select « Arduino Micro » and the port, then Upload. On Windows a .inf driver may be needed for the COM port. Since the 32U4 is the USB itself, a bad sketch can lock out reflashing (double reset).
Going further
Right click with MOUSE_RIGHT; wheel scroll with Mouse.move(0, 0, 1).
bouton-clic-souris.ino
// Bouton sur la broche 2 = clic gauche HID.
#include <Mouse.h>
const int BOUTON = 2;
bool enfonce = false;
void setup() {
pinMode(BOUTON, INPUT_PULLUP);
Mouse.begin();
}
void loop() {
bool appui = digitalRead(BOUTON) == LOW;
if (appui && !enfonce) {
Mouse.click(MOUSE_LEFT);
enfonce = true;
} else if (!appui && enfonce) {
enfonce = false;
}
}