Joystick with XBee

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3) Configure the Radio

If you’re not familiar with configuring radios using AT commands, review the steps in the Basic XBee 802.15.4 Chat tutorial, which walks you through configuring CoolTerm to program the radios.

  • Insert the XBee into the Explorer USB and connect it to your computer.
  • Launch CoolTerm and connect to the XBee.
  • Here are the commands we’re going to use to configure the radio:
Function Command Parameter
Reset ATRE N/A (resets the radio to its factory settings)
PAN ID ATID 3001 (any address from 0 to FFFE will do)
MY Address ATMY 1
Destination address high ATDH 0 (indicates a 16-bit address)
Destination address low ATDL 2 (the address of the receiving radio)
Pin 0 I/O configuration ATD0 3 (digital input)
Pin 1 I/O configuration ATD1 3 (digital input)
Pin 2 I/O configuration ATD2 3 (digital input)
Pin 3 I/O configuration ATD3 3 (digital input)
Change detection ATIC F (bitmap field: first four inputs send samples on change, SEE BELOW for more information)
Write to memory ATWR N/A (save the settings to flash memory)
  • Here’s what your terminal session might look like. The user input is in bold:
+++
OK
ATRE
OK
ATID 3001
OK
ATMY 1
OK
ATDH 0
OK
ATDL 2
OK
ATD0 3
OK
ATD1 3
OK
ATD2 3
OK
ATD3 3
OK
ATIC F
OK
ATWR
OK
ATID
3001
ATMY
1
ATDH
0
ATDL
2
ATD0
3
ATD1
3
ATD2
3
ATD3
3
ATIC
F
ATWR
OK

Note: Remember to issue the ATWR command when you’re done so that the settings are saved in the radio’s flash memory. If you don’t issue this command, the radio will revert to its old settings when it loses power.

Note: the calculator in Macintosh can easily convert bits to hexadecimals. Above you can see that the first four bits are on, and the base-16 (hexadecimal) equivalent is displayed as 0xF. More about this calculator.

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