39 lines
1.3 KiB
Markdown
39 lines
1.3 KiB
Markdown
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# Set Transmit Power
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Sets the transmitter power for ``radio`` communications.
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The power can be set to a value between 0 (-30dbm) and 7 (+4dbm).
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## Range
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At power level 7, in an open area without significant interference (coming from WiFi networks or other devices operating on the 2.4 GHz range), you can get a **range of over 70m**.
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Indoors (or with additional interference), range will be significantly reduced.
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## Important Security Consideration
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The functions in the ``radio`` namespace allow the BBC micro:bit to communicate with other micro:bits.
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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.
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For serious applications, BLE should be considered a substantially more secure alternative.
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```sig
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radio.setTransmitPower(1)
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```
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### Parameters
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* ``power`` -- a [number](/reference/types/number) between ``0`` and ``7``.
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### Example
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Sets the transmitter power to full power at 7.
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```blocks
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radio.setTransmitPower(7)
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```
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### See also
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[receive number](/reference/radio/receive-number), [send number](/reference/radio/send-number), [on data received](/reference/radio/on-data-received)
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