USB-Chicklet 1/2/2007
Cross The Road Electronics, LLC Page 3 1/2/2007
1.) What is USB-Chicklet?
USB-Chicklet is an embedded device that performs USB hosting on USB joysticks,
gamepads, and computer mice, and converts the data into analog and digital signals
compatible with the 15-pin joystick interface found on the FIRST robotics Operator
Interface. The intent is to allow FIRST robotic teams to use supported USB devices to
control their robots without implementing expensive or complicated solutions.
2.) How It Works.
Once you plug in one of the supported USB devices (see Supported Devices) to
USB-Chicklet, its data is converted to analog and digital signals recognized by the
FIRST O/I. Since most devices exceed the 4 analog, 4 digital inputs, each supported
peripheral has a number of “Analog Modes” that specify which analog inputs get
mapped to which joystick axes. If an analog mode is selected that does not use all
four analog inputs for axis data, extra digital inputs can be pushed into the upper four
bits of the unused analog channels, thus allowing users to use more than four digital
inputs on their device.
For example, the Logitech gamepad has four axes: X and Y on the left and right
joysticks. However only mode 2 uses all four axes (See Figure 1 under User
Calibration Mode). So if mode 1 is selected, then left axis Y is mapped to analog input
Y on the OI, and right axis Y is mapped to analog input X on the OI (this mode was
intended for tank steer). This leaves two analog inputs free: Wheel and Aux. Well
since the user may want to use more than the four digital inputs provided: Joystick
Trigger, Joystick Thumb, Aux Switch 1, Aux Switch 2, why not map extra digital inputs
into the unused analog channels? The calibration mode specified in User Calibration
Mode explains how this can be done.
3.) Supported Devices
Logitech Dual Action Gamepad
Logitech Cordless Gamepad
Logitech Attack 3 Joystick
Logitech Extreme 3D Pro Joystick
Logitech NASCAR Racing Wheel
XBox Controller
XBox 360 Controller
Microsoft Intelligent Optical Mouse
Saitek Aviator Joystick
Saitek ST290 Joystick
Saitek ST290 Pro Joystick
(154 pages)
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