kynix05
19 Apr 2017, 09:39 ( Updated at: 19 Apr 2017, 16:05 )

I'm having issues trying to decode a XBee API packet. I start decoding it, but I'm not sure what my actual analog data should be. Several of them look like:

7E 00 12 83 56 78 43 00 05 02 00 00 00 03 FF 03 FF 00 00 00 00 60 
7E 00 12 83 56 78 43 00 05 02 00 03 E8 03 FF 00 2A 00 00 01 C8 84 
7E 00 12 83 56 78 43 00 05 02 00 03 FF 02 DE 00 0D 00 00 03 FF 73 
7E 00 12 83 56 78 42 00 05 02 00 03 FF 00 00 00 00 03 DB 03 FF 83 

So far I have:

7E - start
00 - length byte 1
12 - length byte 2
83 - API identifier
56 - source address byte 1
78 - source address byte 2
43 - RSSI value bytes
00 - option byte
05 - sample quantity byte
02 00 - channel indicator 0000 0010 0000 0000  (A0 is active) (IO header) (I'm not sure if this is right)
last byte is chechsum

I'm using the XBee series 1 using XB24 firmware. I have a Lilypad temperature sensorbased on the MCP9700.

Every time I try to get the ADC data I get a huge number like 51228675.

The doc also says if any of the DIO lines are the first two bytes are the DIO sample. Why do I get "03 FF" or "E8 03" and sometimes "00 00" if I don't have any of the DIO lines active?

Schematic: Lilypad Temperature Sensor (pin S) --> Xbee (pin AD0)

Any help is greatly appreciated trying to find the sensor output.