pxt-calliope/docs/reference/radio/on-data-received.md

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# On Data Received
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Run part of a program when the micro:bit receives a
[number](/reference/types/number) or [string](/reference/types/string) over ``radio``.
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```sig
radio.onDataReceived(() => { });
```
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### Simulator
This function only works on the micro:bit, not in browsers.
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### Example
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This program keeps sending numbers that says 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](/reference/led/plot-bar-graph).
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```blocks
basic.forever(() => {
radio.sendNumber(input.acceleration(Dimension.X));
})
radio.onDataReceived(() => {
led.plotBarGraph(radio.receiveNumber(), 1023);
})
```
### See also
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[receive number](/reference/radio/receive-number),
[send number](/reference/radio/send-number), [set group](/reference/radio/set-group)
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