AVR-Chat

On Feb 16, 2008, at 4:02 PM, dlc wrote:

> What are you using?  I've used Bluetooth and XBee and neither have  
> ever
> given me bad data (no data at all when out of range though.)


The OP sounded like a school assignment (typical plea for help with  
no details as to how anything is being done) so I gave a broad all- 
encompassing generic answer.

Bluetooth, Zigbee, and 802.15.4 are much higher level communication  
protocols than the OP's "4 byte command packet." We have no idea  
whether he has a bidirectional interface. We know he doesn't have  
error detection other than the device behaves wrong when the wrong  
data is received. So we are pretty confident in guessing he doesn't  
have error correction.

Suggested reading: http://en.wikipedia.org/wiki/ 
Forward_error_correction and http://en.wikipedia.org/wiki/ 
Error_correction

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