Update. /JL

microbit/uart.py

@@ -0,0 +1,18 @@
+#UART
+
+""" The uart module lets you talk to a device connected to your board 
+using a serial interface. 
+
+Warning
+    Initializing the UART on external pins will cause the Python console on USB to become 
+    unaccessible, as it uses the same hardware. To bring the console back you must 
+    reinitialize the UART without passing anything for tx or rx (or passing None to these 
+    arguments). This means that calling uart.init(115200) is enough to restore the Python 
+    console."""
+
+#Functions
+
+def init(baudrate=9600, bits=8, parity=None, stop=1, *, tx=None, rx=None):
+    """ Initialize serial communication with the specified parameters on the specified 
+    tx and rx pins. Note that for correct communication, the parameters have to be 
+    the same on both communicating devices. """