I am developing a network system for mine(depth of 2km and the tunnel's length is about 200m). The system includes:
+ Data takers(estimated 200 units) to send signal data every 5 seconds (Data are 22 float variable/taker).
+ A MCU to receive data from data takers, do some calculation and send to ground.
+ Power supply will be battery and device should be able to operate for +2 years
+ Data takers and MCU connection must be wireless
The question is: Which module and network should I use ?
XBee S1 802.15.4
I am planning to use stand alone Xbees as data takers to send data to a (XBee + Arduino) and then from Arduinos send data to a Raspberry(connected with Xbee) for calculation. The Arduinos are there as I think it's not possible to use only XBee and Raspberry (The range of XBee for indoor is 30m while my tunnel is 150-200m long).