Hobby Projects - Insulation tester, LED Circuits, Meters.

Thursday, July 24, 2008

Lammert Bies - Computer Interfacing

Information about computers and how to interface them to all kind of equipment. Both software and hardware help is available. - Lammert Bies

Lammert Bies - Computer Interfacing

  • RS-232 specs
  • RS-485 information
  • The serial UART
  • USB interface
  • Modbus interface
  • Unitronics RJ11

Simple null modem without handshaking

Simple null modem without handshaking

"only the data lines and signal ground are cross connected in the null modem communication cable. All other pins have no connection. An example of such a null modem cable without handshaking can be seen in the figure below."

Museum Of Electricity - Charles Brush

Yes, there were electric lights powered by central stations before Edison's! Carbon arc lamps saw extensive use throughout the USA and the world from the late 1870s on. - Charles Brush

Museum Of Electricity - Charles Brush

The General Electric Company was formed in 1892. It was the result of a meger between the Edison General electric Company and the Thomson-Houston Company, which themselves incorporated several other companies.

Museum Of Electricity - Charles Brush

Electricity, technology, and lots of arcs and sparks!

Museum Of Electricity contains Vintage Electrical and Historical images and description. They include the Edison Lamp, Tesla Coils, Lightning and Atmospheric Electricity and the .....

Amazing Jacob's Ladder

So how do they work?  First two conductive metal rods are positioned in a rough “V” shape with a slight space between them at the base.  A sufficient voltage differential is provided from a high voltage transformer to breakdown the air in the gap between the rods.

e-Learning Resources - Physics at Exeter

Excellent Online Educational Pages at Exeter. Students and Teachers can get ideas on how to enhance and enrich the Science Education Process.

e-Learning Resources - Physics at Exeter

A Sound understanding of Physics and Chemistry is needed for stepping into “Electricity and Magnetism”. We have to move young minds into Electronics even before High School, as a part of Science itself.

e-Learning Resources – Physics at Exeter
  • Practical Electronics II and Electronics for Measurement Systems
  • Feedback and Temperature Control
  • Computer Interfaces for Instrumentation Systems
  • Troubleshooting Op-Amp Circuits
Troubleshooting Op-Amp Circuits

The ability to diagnose and cure problems in a systematic manner is an exceptionally valuable skill. In PHY2028 students are given a heap of components, a breadboard, and measuring equipment.

Feedback and Temperature Control

System Model, Types of Feedback Control, On-Off Control, Proportional+Derivative Control, Proportional+Integral+Derivative Control, Proportional+Integral Control, Third-Order Systems..

Wednesday, July 23, 2008

Temperature Sensor Project - Quozl

Temperature Sensor Project - Quozl

Features

prototype from kitsrus

  • provides real-time data to your computer via serial port,
  • interfaces up to four DS1820 temperature sensors,
  • absolute accuracy near 0.5 degrees celcius (as per DS1820 specifications),
  • relative accuracy near 0.01 degrees celcius,
  • speaks in Centigrade or Fahrenheit (selectable by header pins),
  • powered by your computer's serial port, no extra supply to organise,
  • data format easily processed, no special programs required,
  • minimal parts count reduces cost,
  • built-in serial number for circuit identification,
  • special versions available for exotic requirements; high speed, low speed, additional sensors, long distance or pedantic serial bus.
  • spare inputs can be used as single-bit digital inputs, (feature removed from final version but can be re-inserted),

Quozl's Temperature Sensor Project

Quozl's Open Source