Make: Volume 91

Joan Horvath/Rich Cameron

been “possessed” by another player. (This is

particularly hazardous to classroom decorum

if students are set up to display any string sent

to them!) To reduce accidental crosstalk, avoid

assigning anyone to radio group 1, which is the

default value for the set radio group block,

and thus the most likely to receive erroneous

transmissions.

Each micro:bit can listen on only one numbered

channel at a time. However, intrepid coders

might figure out that it is possible to rapidly cycle

through the groups to broadcast on all of them in

succession. This can, in principle, trigger actions

on all other wands in a 200-foot radius ...