Pololu Wixel User Manual download pdf (Page 49)

Wireless tilt mouse made with two

Wixels and an accelerometer.

9.h. Wireless Tilt Mouse App

Overview

This app allows you to make a wireless tilt mouse for your

computer. By tilting the mouse, you can control the position of the

mouse cursor. The mouse also supports two buttons for clicking.

This app requires two Wixels: a transmitter and a receiver. The

transmitter Wixel detects a tilt using an accelerometer and

wirelessly transmits that information to the receiver Wixel, which

relays it to the computer as mouse movements. The receiver appears

to the computer as a standard USB Human Interface Device (HID);

after the Wixels have been configured, no driver installation is

necessary to use the mouse.

Parts Needed

There are many different ways to build this project. Here are the parts we used:

• Wixel Pair (Fully Assembled) + USB Cable [http://www.pololu.com/catalog/product/1338]

• MMA7361L 3-Axis Accelerometer ±1.5/6g [http://www.pololu.com/catalog/product/1246]

• 3-AAA Battery Holder, Enclosed with Switch [http://www.pololu.com/catalog/product/1147] and 3 AAA batteries

• 270-Point Breadboard [http://www.pololu.com/catalog/product/350]

• Mini Pushbutton Switches [http://www.pololu.com/catalog/product/1400]

You will need wires and connectors to make the electrical connections. We suggest our jumper wire kits

[http://www.pololu.com/catalog/category/29] or premium jumper wires [http://www.pololu.com/catalog/category/65].

You will need a soldering iron [http://www.pololu.com/catalog/category/5] to solder the included header pins into the

accelerometer.

The pushbuttons are optional, and any normally-open (NO) pushbutton or switch will work. If you want to have both

a left mouse button and a right mouse button you should get two pushbuttons. Note that only one button (on P1_2) is

shown in the picture above.

Pinout of Transmitter Wixel

Pin Function

P0_1 analog input for vertical mouse speed

P0_2 analog input for horizontal mouse speed

P1_2 left mouse button input, internally pulled high

P1_7 right mouse button input, internally pulled high

Wixel Configuration

Download the Wireless Tilt Mouse App (v1.0) [http://www.pololu.com/file/download/wireless-tilt-mouse-

v1.0.wxl?file_id=0J470] (26k wxl). Open it with the Wixel Configuration Utility, choose your settings, and write it to

the transmitter Wixel. The transmitter Wixel should now appear to your computer as a USB virtual COM port (with

USB product ID 0x2200). You can not send or receive data on this COM port. Its only purpose is to let the Wixel

9. Wixel Apps Page 49 of 64

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Pololu Wixel User Manual Page 49