WIRELESS SENSOR NETWORK: NETWORK HACKING WITH RASPBERRY PI by HACKER XPLOIT

Author:HACKER, XPLOIT [HACKER, XPLOIT]
Language: eng
Format: azw3
Publisher: UNKNOWN
Published: 2018-12-07T16:00:00+00:00

Testing the Final Project

To test the project, ensure that you start your Arduino first and then the XBee sensor node. Start the Arduino, upload the sketch, and then turn on the serial monitor. You should observe the link lights on the XBee regulated breakout board flicker as the XBee node is accepted by the coordinator on the Arduino and added to the network. Within about 5 seconds, the XBee sensor node begins sending data. When this occurs, the Arduino sketch should start printing statements to your serial monitor. Figure 328 shows an example of the output you should see in the serial monitor.

Figure3-28.Serial monitor output Did you see so mething similar? If so, you’re doing great work and now have the rudimentary components to build sensor nodes and Arduino-based sensor data aggregators.

If you do not see any output in the serial monitor, do not panic. Instead, double-check that the XBee on your Arduino is plugged in correctly and that you are using the correct pins in the sketch that correspond to how the XBee shield you are using connects to the Arduino (not all shields use pins 2 and 3 like the SparkFun shield). Hint: check the documentation for your shield.

If all that is correct, make sure you are using the coordinator API firmware on the XBee connected to the Arduino and the router API firmware on the XBee sensor node. If you are still having issues, step back to the previous project to ensure that the sensor node is still working.

You can also try turning off both the Arduino and the XBee sensor node; then turn on the Arduino, wait about 10 seconds, and turn the XBee sensor node back on. Sometimes the handshake process and network join can stall, and nothing happens for a while. Turning an XBee off and back on in this order ensures that it will reattempt to configure.

On the other hand, maybe you are getting data, but it is not correct—the temperature read is far too low for the actual environment. I had this happen once when the wire I was using to connect to the data pin on the TMP36 was accidentally removed. The bottom line is, always check and recheck your wiring.

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