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Case 1: Compare

Introduction​

Press the button sensor, the micro:bit screen will randomly display numbers from 1 to 6, compare the numbers with your friends.

Purpose of the case​

  1. Learn about the button sensor and its working principle.

  2. Learn about the button sensor programming blocks in MakeCode.

Materials required​

ItemPictureQuantity
micro:bit V21
Jacdac expantion board1
Jacdac 10cm wire1
Button Sensor1
USB Cable1

Sensor principle description:​

Principle description:

Button sensor: A sensor used to detect the status of a button, which outputs signals carrying "0" and "1".

Connection diagram​

As shown in the figure below, insert the micro:bit into the Jacdac expansion board, and use a connecting wire to connect the button sensor to the gold finger interface of the Jacdac expansion board.

Programming software​

Microsoft Makecode

Makecode programming​

Step 1: How to add Jacdac extension​

  1. Enter Microsoft Makecode and click "New Project".

  1. Enter a project name in the pop-up window and click Create.
  1. Click "Extend" in the code drawer.

  1. In the pop-up interface, enter "Jacdac" and click the search icon, select the Jacdac software library, as shown in the figure.

Step 2:​

  1. Connect micro:bit to the computer with a data cable.

Note: If the micro:bit is running the jacdac program for the first time, please pre-install a blank jacdac program to the micro:bit, otherwise skip this step.

  1. Connect the sensor, MakeCode will automatically identify and simulate it, and the sensor will provide real-time feedback of the sensor status in the simulation area.

  2. Click on "ADD BLOCKS" sensor expansion module.

    Note: To connect a new sensor, repeat the "Click on "ADD BLOCKS" sensor expansion module" operation process.

Write the program as shown​

https://makecode.microbit.org/_FEADwWWVCU31

You can also download the program directly from the following webpage, and start running the program after downloading.

Result​

When the button sensor is pressed, numbers 1 to 6 appear randomly on the micro:bit screen.

Thinking​

In this case, in addition to displaying numbers on the micro:bit screen, what other ways are there to express numbers?