Watch this video to see how the radio hardware works on the micro:bit:
on Received Number
Run part of a program when the micro:bit receives a
number over radio
.
radio.onReceivedNumber(function (receivedNumber) {})
Parameters
- receivedNumber: The number that was sent in this packet or
0
if this packet did not contain a number. See send number and send value
Examples
Tell me how fast
This program keeps sending numbers that say how fast the micro:bit is slowing down or speeding up. It also receives numbers for the same thing from nearby micro:bits. It shows these numbers as a bar graph.
basic.forever(() => {
radio.sendNumber(input.acceleration(Dimension.X));
})
radio.onReceivedNumber(function (receivedNumber) {
led.plotBarGraph(receivedNumber, 1023);
})
What’s the distance?
This program uses the signal strength from received packets to graph the approximate distance between two micro:bits.
basic.forever(() => {
radio.sendNumber(0)
})
radio.onReceivedNumber(function (receivedNumber) {
led.plotBarGraph(
Math.abs(radio.receivedPacket(RadioPacketProperty.SignalStrength) + 42),
128 - 42
)
})
Troubleshooting
The ||radio:onReceivedNumber||
event can only be created once, due to the hardware restrictions.
The radio set group might need to be set, synchronized, before the radio events will function.
See also
on received string, received packet, send number, send string, send value, set group
radio