Digilent Pmod JSTK2 Two-axis Joystick

Features and Specifications

• Factory Calibrated Two Axis Resistive Joystick
• Center Joystick Button
• Trigger Style Push Button
• 24-bit RGB LED
• 6-pin Pmod connector with SPI interface
• Library and example code available in Digilent resource center

Overview

The Digilent Pmod JSTK2 (Revision C) is a versatile user input device that can be easily incorporated into a wide variety of projects. With a two-axis joystick on a center button, a trigger button, and a programmable RGB LED capable of 24-bit color.

Functional Description

The Pmod JSTK2 utilizes two potentiometers oriented orthogonally to one another and are manipulated by moving the joystick in the X and Y directions. As the joystick moves, the voltage output at the sweep pin of each potentiometer changes and is measured by the 10-bit ADC present on the embedded PIC16F1618 microcontroller. The raw measured data is stored at a rate of 100 Hz as a 16-bit right-justified variable in RAM with the upper 6 bits masked with zeros.

Additionally, each successive measurement also produces two 8-bit values representative of the joysticks physical location with respect to each axis. Note that if inversion of either of the 8-bit position axis are set, the values will not change until the data has been re-collected by the PIC16 at the 100 Hz rate.

Pmod Series Overview

The Digilent Pmod (peripheral module) Series is a small, low-cost peripheral module that can be used with a wide range of embedded systems and development boards. It is designed to extend the capabilities of embedded systems and development boards by adding new features and functionality. The Pmod communicates with host boards using 6, 8 or 12-pin connectors that can carry multiple digital control signals, taking advantage of standard serial protocols such as SPI and I²C. This allows for more effective designs by routing analog signals and power supplies only where they are needed and away from digital controller boards.

What's in the Box

• Pmod JSTK2
• Plastic motion limiter
• Custom antistatic Pmod packaging