2. Electronics

Walt-Tech

Some of my college electronics projects
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This is the front side of a stand-alone 8088 system I built from scratch. It includes an Intel 8255 PPI for digital I/O. The 8254 is used for timing. EEPROM was programmed for specific purposes, generally wrote in assembly, sometimes with a little C to make things easier.
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This is the front side of a stand-alone 8088 system I built from scratch. It includes an Intel 8255 PPI for digital I/O. The 8254 is used for timing. EEPROM was programmed for specific purposes, generally wrote in assembly, sometimes with a little C to make things easier.

Intel808882558254

  • This is the front side of a stand-alone 8088 system I built from scratch. It includes an Intel 8255 PPI for digital I/O. The 8254 is used for timing. EEPROM was programmed for specific purposes, generally wrote in assembly, sometimes with a little C to make things easier.
  • This is the back side of a stand-alone 8088 system to show the wire wrapping. This doesn't look as complex as I often recall it being.
  • This is the front to a composite video subsystem built for one of my EET classes. I remember this being quite a challenging (but fulfilling) project. Most people never realize how much technology it takes just to move a cursor around a CRT!
  • This is the back to the composite video subsystem showing all the wire wrapping. I remember this being quite a challenging (but fulfilling) project.
  • This is the "front" of a PC ISA card I built to allow digital I/O between a PC and the outside world (other devices I'd build or hack). Way-cool for it's time! I also used this for my senior design project so I could have some fancier control software with a PC interface (instead of simple controls with an LCD panel).
  • This is the "back" of the PC ISA card.
  • This is just the front an LED break-out box I made to make LED testing easier.
  • This is the back of the LED break-out box showing the wire wrapping involved. Saved me time when testing systems that required output to blink LEDs.
  • This is the front of my senior design project, a functional pet door.
  • This is the back of my senior design project, a functional pet door. Yes, I used a power screw-driver with Lego gearing for the mechanical portion. Ugly, but it was functional!
  • This is the "brains" of my senior design project, a functional pet door. I hacked the RF modules from some Radio Shack remote control cars for the pet collar transmitters and matching receivers. Used opto-isolators just for fun to separate the motor controls from the RF, PC linking and other logic circuits. This interfaced with the PC ISA 8255 PPI card so I could control, monitor and provide a nice interface for the system.
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