The latest revision of the micro:bit has a handy on/off/sleep mode to help conserve energy when you are not using the device. You can enter this mode by pressing and holding the power/reset button on the back on the micro:bit.



Sleep

When powered by USBpress and hold power/reset for 5 seconds to enter sleep. The micro:bit power LED will dim from bright red to off. It will then flash on/off, showing you that it is still connected to the power source. Press power/reset to wake up. 


Removing the USB power cable and re-adding it will also wake the micro:bit.


Power off

When powered by battery press and hold power/reset for 5 seconds to power off the micro:bit. The micro:bit power LED will dim from bright red to off. It will then remain off until you press the power/reset to wake up. Disconnecting the USB and battery power supply will also power off the micro:bit.


Inserting a USB power lead will also wake the device.


Wake

Pressing the power/reset again when in sleep/power-off mode will wake the micro:bit and your program will restart.

Removing the USB power cable and re-adding it will also wake the micro:bit.



Further information


For technical details on how this works, see our developer documentation on power consumption.