Keyestudio KS4028 Manual page 360

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(4) Test Results:
Burn the code to the micro:bit, turn on the switch of the smart home model,
and enable the Bluetooth of your device and app.
The password can be set by the button A and B on the micro:bit board.
Pressing A and B respectively means'.'and'-'.
Pressing A and B simultaneously indicates"confirm"
The 5*5 LED lights will show picture and the I2C1602LCD will display
"Successful" and"Open the door", the 6812 2x2 RGB will show purple
color. However, if the password is wrong, "error" will pop up on the LCD
module and "Enter password"will appear.
You can touch the logo of the micro:bit to close the door.
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