Radio set group:
Make a program have the group ID you tell it for sending and receiving with
radio. A group is like a cable channel (a micro:bit can only send or receive in one group at a
time). A group ID is like the cable channel number. If you do not tell your program which
group ID to use with this function, it will figure out its own group ID by itself. If you load the
very same program onto two different micro:bits, they will be able to talk to each other
because they will have the same group ID. In this experiment, we set the group of two micro:
bits to 1 so that they can communicate with each other.
Radio send number:
This block is to broadcast a number to other micro:bits connected via
radio. You need to enter a parameter for this block which is the number you want to send.
On radio received receivedNumber:
Run part of a program when the micro:bit receives a
number over the radio. “receivedNumber” is a parameter, it’s the number that was sent in this
packet or 0 if this packet did not contain a number. If the number received by bit1 (receiv-
er_code) is 3, the code inside the if statement of bit1 will be run. If the number received by
bit2 (send_code) is 4, the code inside the if statement of bit2 will be run.
Download the send_code program to bit2 and receiver_code program to bit1 and see
what happens.
When you're too sleepy, you definitely don't want to get up from your bed and turn off the lights.
When you are busy with other things, you don't feel like being interrupted by knocking on the
door. Well, in this experiment we are ready to help you solve this problem. We will use the
remote control to remotely control these things, instead of having to leave for them.
Experiment 17 – Remotely control your micro:bit
Instruction
At first, the micro: bit matrix LEDs named bit2 will display a crying face, and
then the micro: bit of bit1 will immediately play a melody (comfort bit2), and
the crying face of bit2 will become a smiling face.
Result
Does wireless communication require two or more micro:bits? Then if there are no two
micro:bits, can the micro: bits be controlled wirelessly? For example, the module is used
to wirelessly control the micro: bit.
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