PC Computers (Page 3)

Hardware and Interface with Computer and Hobby Programming.

I got a strange problem as i added more and more peripherals, the pc gave odd messages, “i cannot detect what you are doing” and things like that. I almost flipped trying to locate the culprit. The problem was not in any peripheral but in the USB port powering the system itself. The SMPS was not loading much. Certainly the peripherals were drawing more and the warning could have been more like “use your own power”.  Computer Data Interface

Powered USB Hub Help PC Interface

I could not locate a powered USB with any vendor close by, so i built one and it works perfectly, Now it doubles up as a UPS Low Batter Indicator, by rare coincidence. If the Unregulated DC is above 7 volts, then no bugs. When i adjust the unregulated DC to the 7805 to around 6.9V, then i have a advance warning system.

Wireless USB – Wireless Extension to USB

USB Hub with Power

When power fails, i keep working and listening to music from a Flash Thumb drive. When music stops, i turn of computer, the lead acid batteries gone below 20 V DC. This avoids deep discharge of my batteries. The Powered USB gets undetected when the supply falls below 4.5 probably.

Hill Robertson’s Computer Christmas! Home of the 320 Circuit Parallel Port Controller Box! This is the place to be if you are looking for information about controlling Christmas light displays with a computer.

Computer Christmas - Light Control

Computer Christmas – Light Control – Computer Christmas is a site full of contributions from people all over the world for Christmas light enthusiasts.

HowTo: How to build a triac switching unit SSR – “Here’s how the circuit works: The optoisolator protects your computer from the evil nastiness of the power line. It has an LED that is optically coupled to a triac inside the package. In our application we are supplying the LED side of the MOC3010 with +5 volts.”

Projects –

  • Christmas Light Control Forum
  • A low cost lighting sequencer
  • HowTo: An ‘all in one tester’
  • Build a 16 Ch PicDimmed Renard

The PC is now an economic and common equipment at home or office. To interface it to the real world is a step in learning Automation and Robotics. In Automation we have both Industrial and Home.

Experimenting with Home Automation and Building PC based Instruments is the first step. An Electronics card needs to be interfaced by Serial, Parallel or USB Ports.

Some Small VB6 Software Source for Virtual Electronic Instruments are available here for Learning and Developing.

You can Read More about it at my Data Interface Circuits section Computer Data Interface

These Programs use a component Inpout32.dll from Inpout32.dll from Logix4u, Obtain the Source code and License.

These Programs are for Experimentation and Educational purpose, Not Suitable for Commercial Applications. The Orcad 9 Student Edition Design Source also given here.

Project Source – virtual-instrumentation – Examples of Computer Interface to Instruments

Toy Logic Analyzer

These are the Theory and Description Pages for the VB Programs with circuits in this project.

  1. ICL7135 Printer port Voltmeter
  2. Millivolt Source R-2R Ladder D/A
  3. Preset Counter Simulation
  4. Very Simple Logic Analyzer

Amateur radio is a technical hobby. The attraction? To cover long distances with a low power radio to talk with other people, learn about their countries and cultures.

Amateurfunkbasteln – Amateur Radio Crafts and Electronics

But amateur radio also means tinker devices themselves, solder, apply electronics and learn something. In this sense, it can be a preparation for a technical career or even an engineering degree.

Use Google Translate, the pages are in German.

A Data Logger that records Slowly varying parameters, such as the temperature or decreasing the voltage of a battery. This copy records up to four measurements on parallel and saves it on a EEPROM.

Four Channel Data Logger - Amateurfunkbasteln

Four Channel Data Logger

It measures self-sufficient – without a PC – analog voltages (0-5V), it digitizes and stores the numerical value obtained in a separate memory. Later, after the measuring and recording phase, passes the data logger its information to the PC.