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XBee Configuration
In order for our XBee modules to work well together, we first need to configure them properly. As discussed in About Jarvis, we're using 3 XBee modules. One is connected to the computer, one to the door lock and RFID reader, and one lies inside our remote. We assume you already have some experience with XBee configuration. If not, the XBee datasheet is an excellent source of documentation, and there is also a great guide at arduino.cc (specifically, the Addressing and Configuration sections)
First of all, we need to give a unique address to each XBee. We'll use 1 for the door controller, 2 for the computer and 3 for the remote.
The remote's destination address (DL) will be set to 2, so its messages will only be sent to the computer, the computer's destination address must be set to 1, so its messages are only sent to the door controller, and the door's destination address is set to 2, so its messages are only sent to the computer (check About Jarvis to get a better view of each module's destination address).
After setting the address and destination for the computer and the door controller, no extra configuration is required for the RFID reading to work.
The remote button uses the XBee's I/O line status messages to notify the computer that the button is pressed. As long as the XBee inside the remote is powered, it will periodically transmit a 'MY pin is HIGH' message to the computer, more or less twice a second. To do that, we need to enable the I/O line status messages in the remote xbee and the computer. We use pin D1 for that, so we have to make the necessary adjustments for that.
| Setting | Value |
|---|---|
| DL | 2 |
| MY | 3 |
| SC | 1FF |
| R0 | 10 |
| D1 | 3 |
| IC | FF |
To save the commands to the XBee if programming from a serial monitor send:
ATWR