It is a good idea to place all your sensors in the same area so you know that they should have a similar temperature reading. That way if one of the sensors is off you can easily spot it and investigate what the problem is. Note that these sensors have an accuracy tolerance of +/- 1 degree from the actual temperature so theoretically your sensor readings could differ by up to 2 degrees even if they are right next to each other. If your serial monitor does not look something like the figure above don't worry just go over instructions again to make sure everything is correctly setup, its easy to miss something! If you see the sensor 3 readings in your serial monitor, but you are missing sensor 1 or 2 or both that means one or both of your routers is not sending data to the coordinator. Check the power and communication lights on the XBee adapter boards to ensure they are getting power and are communicating with the coordinator. If they have power, but are not communicating check to make sure you loaded the correct configuration on them.
Well that is it for part 2. Normally I would share the list of parts you need for the next part of the project, but in part 3 and part 4 we will look at multiple options for powering the sensors in the project so read it first and then decide what works best for powering your temperature sensor network. If you have any questions on part 2 use the comment area below or feel free to email your question to me at forcetronics@gmail.com. Stay tuned for part 3!