Datasheet

BLE FAQ

Can I talk to Classic Bluetooth devices with a Bluefruit LE modules?

No. Bluetooth Low Energy and 'Classic' Bluetooth are both part of the same Bluetooth

Core Specification -- defined and maintained by the Bluetooth SIG -- but they are

completely different protocols operating with different physical constraints and

requirements. The two protocols can't talk to each other directly.

Can my Bluefruit LE module connect to other Bluefruit LE peripherals

No, the Bluefruit LE firmware from Adafruit is currently peripheral only, and doesn't run in

Central mode, which would cause the module to behave similar to your mobile phone or

BLE enabled laptop.

If you required Central support, you should look at the newer nRF52832 based products

like the Adafruit Feather nRF52 Bluefruit LE, which contains a SoftDevice which is capable

of running in either Central or Peripheral mode. The nRF518322 based products (such as

the one used in this learning guide) are not capable of running in Central mode because it

isn't supported by the SoftDevice they use, and it isn't possible to update the SoftDevice

safely without special hardware.

Why are none of my changes persisting when I reset with the sample sketches?

In order to ensure that the Bluefruit LE modules are in a known state for the Adafruit demo

sketches, most of them perform a factory reset at the start of the sketch.

This is useful to ensure that the sketch functions properly, but has the side effect of

erasing any custom user data in NVM and setting everything back to factory defaults

every time your board comes out of reset and the sketch runs.

To disable factory reset, open the demo sketch and find the FACTORYRESET_ENABLE

flag and set this to '0', which will prevent the factory reset from happening at startup.

If you don't see the 'FACTORYRESET_ENABLE' flag in your .ino sketch file, you probably

have an older version of the sketches and may need to update to the latest version via the

Arduino library manager.

Do I need CTS and RTS on my UART based Bluefruit LE Module?

Using CTS and RTS isn't strictly necessary when using HW serial, but they should both be

used with SW serial, or any time that a lot of data is being transmitted.