Scratch link
It is possible to connect the Scratch 3 on line to a micro:bit via Bluetooth.
Follow this link for instruction on how to set this up.
Once this has been fully tested and the scratch-microbit hex file has been downloaded to their micro:bit, these are the instructions the user will need to make a connection between Scratch 3 and a micro:bit.
Step 1 - Sign in to Scratch 3.
Step 2 - Click on the blue, Add Extension, button in the bottom left of the Scratch window.
Step 3 - From the Choose an Extension window, find and select micro:bit.
A pop up will appear showing the device name for the micro:bit and the same text should simultaneously scroll across the display on the micro:bit.
guvuz in the example shown on the right.
Step 4 - Click Connect.
Step 5 - When connected, click Go to Editor.
A new micro:bit palette of scripts should have appeared in the Scratch 3 editor.
Step 6 - Create a script and test it.
The script example below will display the Hello! immediately button A on the micro:bit is pressed with out any downloading needed.
Live editing is now possible without the need for downloading.