I would like to have some suggestions about how I could realise a device that is able to make an easy wireless connection (tx and rx) and switch on and off a couple of LEDs. Device description There is a device and a PC. When the device and the PC handshake, the device switches on a green LED.
Pressing the (only) button on the device the LED turns red (green OFF, red ON) and a signal has to be sent to the PC.
The PC can identify which device has made the transmission. When a button is pressed on the PC's program, the LED on the device turns back green (green ON, red OFF), like to say "I got the device x has taken the task".
The transmission will always start from the device. Further characteristics Range: 10s of metres; Obstacles: plasterboards walls (with metallic framework), mobile phones; Hypothetical solutions: WiFi and access-point or any not standard wireless communication; Budget: the cheapest, the easiest; # items: 3 (at the beginning); Software side: no problem on the PC side. I do not have any (really any) idea about where to start. I have never done any wireless communication, so this is a completely new field for me. So, I would be very glad also to receive a suggestion about what to read. Many thanks indeed to anyone who can leave a feedback :)