s2aiomulti Programming Blocks - MrYsLab/s2aiomulti GitHub Wiki
The Scratch blocks for s2aiomulti are essentially the same as the blocks for s2aio, with the exception that an additional drop down list has been added to allow you to assoicate an Arduino board with the block.
The board selector is located on the extreme left hand side of all the blocks.
Please note: Currently only Scratch is supported. Blocks for Snap! will be available sometime in the future.