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Using other than a wired connection to transfer signals or power. Includes optical and (ultra)sound, but most often refers to RF (Radio Frequency). Distances can be as low as centimeters (e.g. RFID); there's no upper limit.
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What is the 'best' way of communicating with small microcontrollers/devices?
Bluetooth LE (Low Energy) is actually perfect for this type of application. It's meant for low power and low bandwidth communication needs, where each device only needs to send very small bursts of in …