For Project QuickShot, I essentially wrote a gesture-controlled "airmouse" for the ATmega32u4 on the Adafruit featherboard. Here is the final version of the sketch.
//*****************************************************
//Project QuickShot v1.0
//Arduino-driven Light Gun Emulator for LCDs
//Jan 11, 2019
//
//Matthew Eargle
//Element14 Presents
//element14.com/presents
//AirborneSurfer Productions
//airbornesurfer.com
//
//Based on code by Jim Lindblom
//
//*****************************************************
// The SFE_LSM9DS1 library requires both Wire and SPI be
// included BEFORE including the 9DS1 library.
#include <Wire.h>
#include <SPI.h>
#include <SparkFunLSM9DS1.h>
#include <Mouse.h>
LSM9DS1 imu;
#define LSM9DS1_M 0x1E // Would be 0x1C if SDO_M is LOW
#define LSM9DS1_AG 0x6B // Would be 0x6A if SDO_AG is LOW
const int mouseButton = 10;
//Refresh rate between polling intervals, lower is smoother movement
#define REFRESH_RATE 1
static unsigned long lastRefresh = 0;
void setup()
{
Serial.begin(115200);
pinMode(mouseButton, INPUT);
Mouse.begin();
// Before initializing the IMU, there are a few settings
// we may need to adjust. Use the settings struct to set
// the device's communication mode and addresses:
imu.settings.device.commInterface = IMU_MODE_I2C;
imu.settings.device.mAddress = LSM9DS1_M;
imu.settings.device.agAddress = LSM9DS1_AG;
// The above lines will only take effect AFTER calling
// imu.begin(), which verifies communication with the IMU
// and turns it on.
if (!imu.begin())
{
Serial.println("Failed to communicate with LSM9DS1.");
Serial.println("Double-check wiring.");
Serial.println("Default settings in this sketch will " \
"work for an out of the box LSM9DS1 " \
"Breakout, but may need to be modified " \
"if the board jumpers are.");
while (1)
;
}
}
void loop()
{
digitalWrite(mouseButton, HIGH);
int clickState = digitalRead(mouseButton);
// Update the sensor values whenever new data is available
if ( imu.accelAvailable() )
{
// To read from the accelerometer, first call the
// readAccel() function. When it exits, it'll update the
// ax, ay, and az variables with the most current data.
imu.readAccel();
}
// if the mouse button is pressed:
if (clickState == LOW) {
// if the mouse is not pressed, press it:
if (!Mouse.isPressed(MOUSE_LEFT)) {
Mouse.press(MOUSE_LEFT);
}
}
// else the mouse button is not pressed:
else {
// if the mouse is pressed, release it:
if (Mouse.isPressed(MOUSE_LEFT)) {
Mouse.release(MOUSE_LEFT);
}
}
if ((lastRefresh + REFRESH_RATE) < millis())
{
moveMouse();
lastRefresh = millis();
}
}
void moveMouse()
{
// Now we can use the ax, ay, and az variables as we please.
Serial.print("Move X,Y: ");
int xMove = ((imu.calcAccel(imu.ax) * 10));
Serial.print(xMove);
Serial.print(", ");
int yMove = ((imu.calcAccel(imu.ay) * -10));
Serial.print(yMove);
Mouse.move(xMove, yMove, 0);
Serial.println();
}