So far, we have talked about short distance communication methods where a fairly powerful radio transmitter is used to communicate with devices within a room or in the next room. Today, we will see a method which is effective only when the devices are within millimetres or at most centimetres of each other? Why would you need communication over such an ultra-short distance at all? Let’s find out. Continue reading “When devices whisper to each other – Part 4: Near Field Communication (NFC)”