Connect 2.4Ghz Nordic NRF24L01+ transceiver to Arduino and run the pingpair_ack example sketch from the RF24 library. A pair of these will communicate over a range of approx 10-20m indoors with 2 concrete walls in-between. Range outdoors is approx 20-40m. The scanner sketch is also useful to find free channel in heavy wifi traffic.
Solution to create home network via nrf24 and arduino.
Plus LEDcontrol, DHT11(temperature sensor), IR control, button control, IR motion Sensor.
MySensors Standard Board
Arduino Pro Mini + NRF24L01+
2 Sensor inputs
10 pin expansion header for connecting an expansion board(to be made)
The expansion board will have 4 extra digital inputs/outputs and 2 Analog inputs