AVR-Chat

On Sep 29, 2005, at 9:17 PM, pinky elodia wrote:

> thanks....for your concern...
> actually where can i get information about this..maybe about your  
> project....
> now, i,m thinking to make to kind of sensor ( light and  
> temperature) and control by one uC,ATmega128...is it possible?? For  
> ATmega128, there are 4 input for ADC right?..but i quite confuse  
> how to read data form ADC..because its convert into 10 bit  
> data....save into 2 register..normally we just use 8 bit data....

Am thinking you are facing a steep learning curve. If you only desire  
8 of the 10 bits then just throw the 2 least significant bits away.  
Just because the data paths are only 8 bits wide doesn't mean you  
can't handle 10 or 16 bit numbers.

> i would like to transmit data through TCP/IP protocol witout using  
> PC.....can i use RF transmitter? or what kind of transmitter  
> suitable for this system?
> sorry for asking too many question....i'm new with uC programming
> really hopes you can help me......

Now you are stretching for the really hard stuff to do right. A good  
bit beyond the skills necessary for dealing with 10 bits in 8 bit  
registers. Then again the desire to do it may be what it takes to get  
you to the point that you can do it.

Look at Fred Eady's stuff at http://edtp.com/  He sells hardware and  
books implementing all the network stuff you are talking about.  
Ethernet. Wireless. Very reasonable prices. Very good place for  
beginners and hobbyists.

On the wireless sensor side of things http://www.tinyos.net/ is all  
about doing the sort of thing you ask. This is more difficult, more  
professional, graduate level stuff. However there are plenty of off- 
the-shelf hardware for sale and lots of example software.

--
David Kelly N4HHE, dkelly@HiWAAY.net
========================================================================
Whom computers would destroy, they must first drive mad.