pxt-calliope/docs/projects/messenger.md

Messenger

Use the radio in an app that sends "YO" messages.

Step 1

Use ||input:on button pressed|| to send the number 0 over radio.

input.onButtonPressed(Button.A, () => {
    radio.sendNumber(0);
});

Step 2

Use ||radio:on data packet received|| display "YO" when the number 0 is received by radio.

let message = 0;
radio.onDataPacketReceived(({ receivedNumber }) => {
    message = receivedNumber;
    if (message == 0) {
        basic.showString("YO")
    }
})

Download the program to one @boardname@ and then to another. Press button A on one and see if the other gets a message.

Step 3

Use ||input:on button pressed|| to send the number 1 over radio.

input.onButtonPressed(Button.B, () => {
    radio.sendNumber(1);
});

Step 4

Add blocks in ||radio:on data packet received|| to display "BYE" when the number 1 is received by radio.

let message = 0;
radio.onDataPacketReceived(({ receivedNumber }) => {
    message = receivedNumber;
    if (message == 0) {
        basic.showString("YO")
    }
    if (message == 1) {
        basic.showString("BYE")
    }
})

Download the program to the @boardname@s again and try your messenger!

radio