Game Gun

Overview

This is a self-deploy project. I used an Arduino and MPU6050 sensor and Qt for creating a gun for computer games. We place the sensor in a toy gun and make connections to Arduino using wires. In this project, I connect Arduino to computer using serial-port. Then we can capture the motions with sensor, move the datas to computer using Arduino and process them with Qt.

note: This is the first scheme of project. There are lots of space for improvement.

Motion Capture and Arduino

As I said before, I used MPU6050 for motion capture, using two gyro-axis. Accelerometer and gyroscope in the sensor capture the non-gravitational acceleration and the rotational motion. Then I send the raw data to computer for process.

The code is available here:

• Arduino-Code

Driver and Qt

The data send and received using UART communication. After that, there is 4 phase:

• Sensor calibration: The first 100 data will use for sensor calibration.
• Low-Pass-Filter: The LPF needed for better user experience, unless the cursor will vibrate.
• Compute the position: The last step, compute the position of cursor using last-moment data and new data.
• Move cursor: Just need to move the cursor to the new position.

The code is available here:

• win_main.cpp
• win_main.h
• main.cpp

notes

For moving the cursor, I used Qt built-in libraries such as QCursor but for detecting the left-click(fire button on gun), I used windows.h library. The parameters in data process like SENSIVITY and CALIBRE_COUNTER have been set based on experiance.