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The HC-05, a Bluetooth to serial bridge, can be found for around $5 on the internet and therefore may be the cheapest way to add Bluetooth connectivity to your project. However, its default setting… ...
It all starts with the HC-05 Bluetooth module, which is meant to transfer serial data, but which can be converted into a general-purpose device costing ten times as much with a simple Flash ROM ...
Poole warned that because HC-05 and HC-06 were relatively common and affordable Bluetooth modules, they were also used for perfectly legitimate purposes, so detecting one of those devices in the ...