pxt-calliope/docs/reference/radio/set-transmit-power.md

Set Transmit Power

Make the radio signal of the micro:bit stronger or weaker. It can be as weak as 0 and as strong as 7.

The scientific name for the strength of the radio signal is dBm, or decibel-milliwatts. A signal strength of 0 can be measured as -30 dBm, and a strength of 7 can be measured as +4 dBm.

Range

If your micro:bit is sending with a strength of 7, and you are in an open area without many other computers around, the micro:bit signal can reach as far as 70 meters (about 230 feet).

Parameters

• a number between 0 and 7 that means how strong the signal is.

Example

This program makes the radio send at full strength.

radio.setTransmitPower(7)

See also

receive number, send number, on data received