Freescale Semi

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  • Wireless Tilt Mouse

  • Created: Mar 30, 2015

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Wireless tilt mouse allows the control of mouse cursor on the PC screen through tilting of the board. It specifically uses the Freescale's FXLN8371QR1 accelerometer, which is a family of 3-axis, low-power, low-g, analog output accelerometers that consist of an acceleration sensor along with a CMOS signal conditioning and control ASIC in a 3x3x1 mm QFN package. The analog outputs for the X, Y, and Z axes are internally compensated for zero-g offset and sensitivity, and then buffered to the output pads. The outputs have a fixed zero-g offset of 0.75V, irrespective of the VDD supply voltage. The bandwidth of the output signal for each axis may be independently adjusted using external capacitors. This handheld mouse device measures its tilt and then wirelessly transmits the data to a base unit. It is connected to a PC through a USB cable and can be recognized by certain modern computers as an actual mouse.

In the circuit, the analog data from a 3-D accelerometer and from two pushbuttons are acquired, converted and radio transmitted by a wireless module using the standard protocol. On the receiver side there is another module connected to the PC through an EasyUSB module that allows both file storing and communication on the same interface and is seen by the PC as a common mass storage device. In practice, there is no need to install any application on the PC: the software that communicates with the XBee and emulates the mouse functions is inherent inside the EasyUSB itself and it is automatically recognized by the PC as an USB drive. The AA batteries power the accelerometer/transmitter board.

The purpose of this project is to explore the possibility of creating a wireless mouse that could be used in any location without having a flat surface to move it on. A handheld device with accelerometers can detect its own orientation, which can be used to control a user's arm movements. It is specially made to transmit data wirelessly to a base station so that there is no need to use any wires connecting the handheld device to the computer it controls, which will limit the range and comfort when using the mouse from a distance. This device can be integrated to an analog TV via an RCA cable where the user could play a game of minesweeper or any possible games using the wireless mouse.