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07 - Radio Wireless

Overview​

2.4G radio wireless communication, only supports communication between ESP32 series hardware (cannot communicate with Microbit via 2.4G)

This communication method supports communication between three types of boards: Grape Board, Future Board, and Future Board Lite

Application method​

Building Blocks Introduction​

Programming Building BlocksDescription
image-20240321151836593Wireless communication, initialization block, which needs to be run before using other wireless blocksSet wireless channel (only boards on the same channel can communicate) Parameter range: 1~13
image-20240321151845160Get wireless message, which will be cleared after being used once, until the next wireless message is received
image-20240321151853859Wait for wireless message arrival and return
image-20240321151902156Send wireless message

Case 1 - Wireless light switch​

  • Effect: Need two micro:bits, download the receiver and transmitter programs, and press the buttons A and B on the receiver micro:bit to turn on and turn off the colored lights on the other micro:bit

  • Program - Transmitter

    image-20240321152020289

  • Program - Receiver

image-20240321152219289

Case 2 - Anti-lost Device for Kids​

  • Effect: When the two Grape boards exceed the distance and cannot communicate, the parent's Grape board will raise an alarm.

    2024md_pic/1670298603324-b3c5b868-5786-4efa-83f0-e8c36cedb4d4.png

  • Program - Parent Side

    image-20240321160242126

  • Program - Child Side

image-20240321152443023