Thursday, December 16, 2010

Ozone Generator Characteristics

Ozone gas is now-a-days used for treatment of drinking water, disinfection, and air-purification. What one re- quires is a small and handy unit to be plugged into mains to get ozonated air at suitable pressure flowing out from a tube It can then be let into environment or bubbled through water or any other polluted liquid. But the gadget must be completely safe to work with.

Ozone generators invariably make use of a discharge tube to which a high electric field is applied so as to break down the oxygen present in the air. This phenomenon occurs at or near a field strength of 25 kV/cm, and the resulting discharge that takes place is known as corona. The corona has a light bluish glow. It is in this corona field that oxygen becomes ozone (O3).

Ozone has tendency to revert back to its original form in about 10-20 minutes, in the atmosphere. Therefore, it is necessary in any ozone application to generate ozone as and when requied for use since it cannot be kept stored the way chlorine is stored (in cylinders). Chlorine is used in our cities to disinfect drinking water supply. It is highly carcinogenic because when it comes into contact with remnants of pesticides in our foodstuff (vegetables), it generathalomethanes, which are carcinogenic. That is why, ozone is used today in preference to chlorine.  Complete disinfection of water, in any impure form, is realised with an ozone content of 4 mg/litre.

Sunday, December 12, 2010

Advantages Of ZigBee

Though development of Zibee standards is still under progress, there are lot many applications for ZigBee due to their some good advantages. Zigbee is mostly used in Home automation systems and control.

Here's some advantages of ZigBee

  1. Chip-vendor independence
  2. Rapid innovation
  3. Extremely Low cost
  4. Open standards enable markets
  5. Easy to deploy
  6. Excellent performance in environments with low signal-to-noise ratio
  7. Appropriate range of operation (30 - 100 meters)
  8. Appropriate and reliable data transfer, bit rate : 250kbps at 2.4 GHz
  9. Very low power consumption
  10. Secure data transfer
  11. Zigbee protocol needs less than 64 kb of ROM and 2-32 kb of RAM
  12. Zigbee can bee implemented with any type of microcontroller

Saturday, December 11, 2010

gpsim - Open source simulator for Microchip PIC

gpsim is an open source simulator for Microchip's PIC microcontrolers. It supports all the three families of PICs. 12-bit, 14-bit, and 16-bit cores. The gnupic gpsim is distributed under the GNU General Public License. This software let you test the code for a microcontroller without using the real microcontroller by saving time and cost.

Distributor : Being free and open source, this software can be downloaded freely from the website of the software.

Home page : gpsim.sourceforge.net
 
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