DIY Gesture Controlled Arduino Based Air Mouse using Accelerometer

This gesture-controlled air mouse project translates physical movements into computer cursor commands using an Arduino Nano as the central processing unit. The core of the motion-sensing mechanism is the ADXL335 accelerometer module, an analog sensor that continuously measures acceleration forces along the X, Y, and Z axes. As you tilt or move the device, the accelerometer outputs varying analog voltage levels corresponding to these spatial changes. The Arduino Nano's built-in analog-to-digital converters (ADCs) read these voltage signals and process the coordinate data. Simultaneously, three push buttons wired to the circuit act as standard mouse inputs for left-clicks, right-clicks, or custom macros, while an onboard LED provides visual status feedback. Once the Arduino translates the sensor inputs and button states into directional and click commands, it transmits this data wirelessly via serial communication using an HC-05 Bluetooth module. On the receiving end, a Python script running on a host computer intercepts the incoming Bluetooth data stream. This software maps the received values directly to the computer's operating system cursor movements and mouse clicks, allowing you to control the screen pointer entirely through spatial gestures in real time without needing a traditional flat desk surface.