https://devzone.nordicsemi.com/f/nordic-q-a/10331/nrf51822-diff-bluetooth-versionIs it possible to communicate between nRF51822 and device that is using older bluetooth version (2,3) ?en-USTelligent Community 13Wed, 18 Nov 2015 18:17:52 GMThttps://devzone.nordicsemi.com/thread/38353?ContentTypeID=1Wed, 18 Nov 2015 18:17:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:43802a4a-0281-4739-9e9a-f34e78f650cdEinar Thorsrud<p>No, it is not possible. <a href="https://en.wikipedia.org/wiki/Bluetooth_low_energy">Bluetooth Low Energy</a> is very different from <a href="https://en.wikipedia.org/wiki/Bluetooth">Classic Bluetooth</a> (and in fact started off as a totally independant standard, Wibree).</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/38352?ContentTypeID=1Wed, 18 Nov 2015 15:47:04 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c9d9ff1e-3d59-4cbc-8b5e-1cdb4ddf12a0awneil<p><strong>No.</strong></p> <p>nRF5x are Bluetooth Smart (aka Low Energy) <strong><em>only</em></strong> - and that is (at least) v4.0 of Bluetooth.</p><div style="clear:both;"></div>