Send Number

Broadcasts a number data packet to other micro:bits connected via radio.

Important Security Consideration

The functions in the radio namespace allow the BBC micro:bit to communicate with other micro:bits.

This API does not contain any form of encryption, authentication or authorization. It's purpose is solely for use as a teaching aid to demonstrate how simple communications operates, and to provide a sandpit through which learning can take place.

For serious applications, BLE should be considered a substantially more secure alternative.

radio.sendNumber(0)

Parameters

packet - a number to be transmitted.

Examples

Broadcasts the value of acceleration x to other micro:bits.

input.onButtonPressed(Button.A, () => {
    radio.sendNumber(input.acceleration(Dimension.X))
})

Light level sender

This example broadcasts the level of the light around it:

radio.setGroup(99)
basic.forever(() => {
    let level = input.lightLevel()
    radio.sendNumber(level)
})

This example shows the light level from the sender (above):

radio.setGroup(99)
basic.forever(() => {
    let level = radio.receiveNumber()
    basic.showNumber(level)
})

Mailbot

This example takes the signal from the light level sender (above) and shows a text string if the light level becomes much brighter. You can put the light level sender in your mailbox and it will tell you when someone opens the box. You can try this with a normal box too, like a present.

radio.setGroup(99)
let max = 0
basic.forever(() => {
    let level = radio.receiveNumber()
    if (level > max) {
        let max = level
    }
    if (max > 10) {
        basic.showString("ALERT")
    }
})

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