Data Sheet

Bluetooth Wireless Communication
The on board 2.4GHz transceiver supports Bluetooth communications via the$Nordic
S140 SoftDevice, which provides a fully qualified Bluetooth low energy stack. This allows
the micro:bit to communicate with a wide range of Bluetooth devices, including
smartphones and tablets.!
Low level radio communications
The on board 2.4GHz transceiver supports a number of other radio communications
standards, on which we build the microbit-radio protocol This protocol provides a very
simple small-packet broadcast radio interface between other devices that support it, such
as other micro:bit devices. The ‘radio’ interface that appears in a number of the
languages on the micro:bit is built on top of this protocol. Additionally, the micro:bit
runtime software adds a ‘group code’ to each data payload, allowing for simple user
managed device addressing and filtering to take place.!
item
details
Stack
Bluetooth 5.1 with Bluetooth Low Energy(BLE)
Band
2.4GHz ISM (Industrial, Scientific and Medical)
2.4GHz..2.41GHz
Channels
50 2MHz channels, only 40 used (0 to 39), 3
advertising channels (37,38,39)
Sensitivity
-93dBm in Bluetooth low energy mode
Tx Power
-40dBm to 4dBm
Role
GAP Peripheral & GAP Central
Congestion avoidance
Adaptive Frequency Hopping
Profiles
BBC micro:bit profile
More Info
Bluetooth
item
details
Protocol
Micro:bit Radio
Freq band
2.4GHz
Channel rate
1Mbps or 2Mbps
Encryption
None
Channels
80 (0..80)
Group codes
255
4
© Micro:bit Educational Foundation 2020