Start by creating a new project. Navigate to MakeCode for Microbit and click on 'New Project'. Give your project a name, such as 'Weather Station'.

First, we need to declare and initialize our two main variables: 'mode' and 'reading'. 'Mode' will help us determine which sensor's data we want to display, and 'reading' will store the sensor data. Add the following code:

let reading = 0
let mode = 0
mode = 1

The following are the different modes we will have:

1. displays the temperature (press A).
2. displays the light level (press B).
3. displays the sound level (press A and B together).
4. displays movement (switches on when a loud sound is detected).
   

Let's start by configuring Button A. When this button is pressed, we want 'mode' to be 1. Add the following code:

input.onButtonPressed(Button.A, function () {
   mode = 1
})

Next, let's configure Button B. When this button is pressed, we want 'mode' to be 2. Add the following code:

input.onButtonPressed(Button.B, function () {
    mode = 2
})