1) 20 'slave' devices talk to a nearby (20" away) 'master' device over I2C.
2) Several master devices use RS485 to talk to a single Client radio.
3) Several Client radios communicate wirelessly to the Server radio that is connected to the PC.
4) The Server radio uses RS485 to connect to the PC: a RS485-Serial converter, connected to a USB-Serial converter, plugged into a USB port on the PC.
5) A VB application sends commands to and receives data from device. Data is saved to a CSV (Excel) file.
A $35USD radio will get you 300' indoor range, a $100USD radio will get you 20 mile outdoor range.
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