I own a FEZ Spider, and I’ve been a sleeper on this forum for a while now ;), still didn’t have the change to crack open my Spider and play with it, work related.
While away from the Spider I’ve thinking about a project that i would like to realize and instead of waiting to get home and play with the hardware i figured i may take advantage of the free time and write a white paper about how i would realize such a project in the most effective way ( stability, performance and economics), so i have most of my ideas down and how to do the whole process.
Now the only thing that is driving me nuts and i can’t quite figure out is as follow:
lets assume i want to read a sensor Ex: Temp and a PIR or Photolight sensor. in the lab all i would need to do is connect it to the proper socket and do the readings just fine. but in Production naturally the sensors are not going to be next to the Board, let’s say the Board will be in a central location, and each sensor will be placed at a distant location; let us assume between 20 to 100 meters… (Not an Bird eye View), cables looping around walls (cement walls) so on and so forth.
So is there a simple way to amplify the sensor’s readings so it would make it to the central unit without interference and intact? i mean how would one communicate with a sensor far from the station:
so far I’ve come up with the following:
Using XBee: cost prohibitive because each sensor’s price would go up. (yes i can put certain sensors in one location and use one Xbee) but still expensive.
Using Radio frequency: not sure about performance and stability of this solution. especially with interference.
Some other methods where using cables Ethernet (Cat-5e or 6e) cables would be best… how could one do this…?
To make this easy let us assume one of the most basic Project one could do at home: HOME AUTOMATION…
so i have a Spider near a Router and i have a PIR and a Light Sensor OUTSIDE, PIR for motion detection of course and Light sensor for light control based on the daylight. now how would those communicate with my spider without the above mentioned methods or using the above methods but without sacrificing Quality and increasing the per sensor budget?