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Digital Electronics Projects
Trevecca physics and engineering students have participated in several interesting design projects using FPGA (Field Programmable Gate Arrays) and CPLD (Complex Programmable Logic) devices.   In our digital electronics course, students learn Verilog HDL (Hardware Description Language) and most of the work for the course is implemented in real hardware using an Altera DE2 FPGA development board.   A few student designs from the final project in the class are shown in the pictures below.
Matt Keffer and Zane Cooke designed the first-generation "Twirly" which uses an encoder to track the angle of the board and two rows of LEDs which display a message from an on-board usb-programmable eeprom.  The encoder allows the image to stay in the same location even if the twirling speed changes and the interleaved rows of LEDs allow the logic to display a more continuous image.  This Verilog design is implemented on an Altera EPM1270 CPLD.
The second-generation Twirly was designed by Aaron Stevens and Jonathon Unruh. Their design uses a row of 32 RGB leds to display a color image. The latest version has animation which can play a series of 32 images, one image per "twirl"!  A LabView program allows any bitmap image to be downloaded to the twirly.
An old pinball machine was rewired to use the Altera DE2 FPGA board and two custom-built driver boards designed at Trevecca.  Graham West made a great sound library that is played by the FPGA.  He used a LabView program to auto-generate the Verilog for the sound module.
The digital logic class also worked on part of the balancing robot that is shown on the student design projects page.  They created the logic for the rotary encoders and logic to decode the radio control unit so the robot can be driven by remote control.
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