Aero Mouse

This is a wireless mouse which connects with computer using bluetooth. Unlike other bluetooth mice which use laser, aero mouse uses gyro sensor to control the pointer which allows us to use the mouse without the requirement of any surface.
This mouse was created as a project of Microcontroller and Microprocessor course in CSE, BUET.

Equipments

Hardware

• ATmega32
• MPU-6050 Gyro + Accelerometer
• HC-05 Bluetooth Module
• 9V Battery
• Buck Converter
• Push Buttons

Software

• Mouse Driver
• Java

Working Principle

The whole mouse is powered by a single 9V battery. The voltage of the battery is converted to 5V using a buck converter. When the mouse is turned on, it calibrates itself. After that the MPU-6050 keeps collecting data and sends the raw data to the ATmega32. The ATmega32 then converts the raw values and sends them over bluetooth using the HC-05 module.

On the receiving device, we need to install the aero mouse driver which is written by us and given in the github repository. The driver was written in Java and needs Java to run. It uses serial communication to receive data over bluetooth and uses Java's Robot class to control the mouse pointer and buttons.

Check out this video to see our demonstration of Aero Mouse. If you are curious about the codes, you can check them out in our github repository.

Block Diagram

Pin Diagram

Problems Faced

• At first bluetooth module was sending garbage data. We needed to change the clock speed of ATmega32 from 1MHz to 8Mhz in order to solve the problem.
• To change the clock speed, we needed to change the fuse bits of ATmega. Unfortunately we made some mistakes during that which led us burning 3 ATmegas.
• The default baud rate of bluetooth module was 9600bps which caused a 50ms latency. Then we change the baud rate to 38400 which resulted in a 12-15ms delay. It improved the performance by a lot.