# One, Two, Three {% hint style="info" %} ## Teachers Notes In this lesson the kids will code each button on the micro:bit. The program will word as follows: * When button A is pressed, the LED's will show 1. * When B is pressed, the LED's will show 2. * When A+B is pressed, the LED's will show 3. The kids will use the **show string** block to display the numbers and the **Input -> on button pressed** block to trigger button presses. The **on button** **pressed** block can be found under the pink **Input** category. This block allows to to select 3 option from the dropdown namely A, B, A+B which corresponds to each button. You will use 3 of these blocks. Each for one button {% endhint %} ## Create your new program Click on the ***micro:bit*** icon on your toolbar or go to on your browser. ![](https://blobscdn.gitbook.com/v0/b/gitbook-28427.appspot.com/o/assets%2F-LskXJjPT2bXMIodrtZq%2F-LskcML6iX1eVw_Fa0KA%2F-LskclQv7ySUOW6M71CY%2FMakeCode1.png?alt=media\&token=1464773f-ef91-4b77-b6ed-527e2515a128) Click on "***New Project***". The MakeCode editor will appear Delete the **on start** and **forever** blocks by dragging it to the toolbar ![](https://1854716099-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LskXJjPT2bXMIodrtZq%2F-Lt6l00Zh0PXFGrgByjM%2F-Lt6lLB0HMlgU9ta9LJK%2F3-1.png?alt=media\&token=3c155ecb-1af3-4aaf-9adf-8996c7bccc81) ## Show 1 when I press button A {% hint style="success" %} Kids task You will need to program your micro:bit so that when you press button A, the number 1 is displayed {% endhint %} Click on the pink **Input** category in the toolbox ![](https://1854716099-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LskXJjPT2bXMIodrtZq%2F-Lt6l00Zh0PXFGrgByjM%2F-Lt6lLB3pjvpUE0fWP6t%2F3-2.png?alt=media\&token=c6df3e46-9991-464e-a425-084c3a8fa319) Drag the **on button press** block and move it to your workspace ![](https://1854716099-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LskXJjPT2bXMIodrtZq%2F-Lt6l00Zh0PXFGrgByjM%2F-Lt6lLB5tQjkJNUaKjKw%2F3-3.png?alt=media\&token=33666817-893e-4cd2-889c-e4241b2c7e8f) Your workspace should look like the image below ![](https://1854716099-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LskXJjPT2bXMIodrtZq%2F-Lt6m7wq-qxNWGplQLmY%2F-Lt6nEMDi9bz4uXs9ubE%2F3-a.png?alt=media\&token=568c864f-26e8-49cf-94ff-1b74ffcd3c9c) Find the **show string** block under **Basic** ![](https://1854716099-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LskXJjPT2bXMIodrtZq%2F-Lt6m7wq-qxNWGplQLmY%2F-Lt6nEMJaZ9AXF5ZI4sL%2F3-b.png?alt=media\&token=8e10cff7-e855-4f92-8264-3c360f356a9a) Drag the **show string** block and move it inside the **on button pressed** block Type in **1** in the **show string** block ![](https://1854716099-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LskXJjPT2bXMIodrtZq%2F-Lt6l00Zh0PXFGrgByjM%2F-Lt6lLB7jDy7vsg4KQ7x%2F3-5.png?alt=media\&token=999f27fc-d1f4-4a52-a60c-8385e8acce8f) On the simulator side, press the **A button** and you will see 1 display ![](https://1854716099-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LskXJjPT2bXMIodrtZq%2F-Lt6l00Zh0PXFGrgByjM%2F-Lt6lLB84I2t6omtRjfH%2F3-6.png?alt=media\&token=2b4ed718-9a47-4c84-a5f3-23fc928fe1f9) ## Show 2 when I press button B {% hint style="success" %} Kids task You will now need to program your micro:bit so that when you press button B, the number 2 is displayed {% endhint %} Drag another **on press button** block to your workspace Click on the drop down by A and you will see 3 options displayed. ![](https://1854716099-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LskXJjPT2bXMIodrtZq%2F-Lt6l00Zh0PXFGrgByjM%2F-Lt6lLB9GBao3k8CPMn5%2F3-7.png?alt=media\&token=c67dd360-9eb2-468e-8248-871e1fc2506c) Select **B** from the dropdown What this means is that when you press button **B**, something will happen ![](https://1854716099-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LskXJjPT2bXMIodrtZq%2F-Lt6l00Zh0PXFGrgByjM%2F-Lt6lLBAhPj4F8kyhjyU%2F3-8.png?alt=media\&token=8f451f0d-f285-434f-9e18-96bd07d5c7a3) Drag a show string block to the **on button button B pressed** code block. Type **2** in the **show string** code block. ![](https://1854716099-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LskXJjPT2bXMIodrtZq%2F-Lt6l00Zh0PXFGrgByjM%2F-Lt6lLBBKd_MKVrQ9CXc%2F3-9.png?alt=media\&token=d8926a25-32ee-45a6-86fa-821139377f79) On the simulator side, press **button B** and the LED should display 2 ![](https://1854716099-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LskXJjPT2bXMIodrtZq%2F-Lt6l00Zh0PXFGrgByjM%2F-Lt6lLBCUaslmLL2qUSE%2F3-10.png?alt=media\&token=df6d2712-0084-4428-b4bf-96e4fe8e935f) ## Show 3 when I press button A+B {% hint style="success" %} Kids task Lastly you will now need to program your micro:bit so that when you press button A and button B, the number 3 is displayed {% endhint %} Once again, drag the **on button pressed** code block to your workspace ![](https://1854716099-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LskXJjPT2bXMIodrtZq%2F-Lt6l00Zh0PXFGrgByjM%2F-Lt6lLBExbpGzJ--6-Nf%2F3-11.png?alt=media\&token=5e524277-e04b-4387-8250-655af30b20f2) Select the option A+B from the drop down ![](https://1854716099-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LskXJjPT2bXMIodrtZq%2F-Lt6l00Zh0PXFGrgByjM%2F-Lt6lLBF_MCi9Q-wGBFC%2F3-12.png?alt=media\&token=b6b5b887-14f2-4c5b-ba38-07edae22a1a3) Drag a **show string** code block to the **on button A+B pressed** code block. Type 3 on in the **show string** code block ![](https://1854716099-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LskXJjPT2bXMIodrtZq%2F-Lt6l00Zh0PXFGrgByjM%2F-Lt6lLBGa-NQRIn_1uAZ%2F3-13.png?alt=media\&token=464e9558-e578-42c8-b322-068723c43827) In the simulator, press the **A+B Button** and the LED should display 3 ![](https://1854716099-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LskXJjPT2bXMIodrtZq%2F-Lt6l00Zh0PXFGrgByjM%2F-Lt6lLBH3pfxpgq9BM1m%2F3-14.png?alt=media\&token=4b40ebdc-3efe-4a21-a861-1d2b7c8cbfd6) ## Save, download and run your code Save you code as **1 2 3** and press save to download. ![](https://1854716099-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LskXJjPT2bXMIodrtZq%2F-Lt6l00Zh0PXFGrgByjM%2F-Lt6lLBIZ5pj3ps2bprU%2F3-15.png?alt=media\&token=fc540a4b-dd77-40bf-8d8c-3affe8ef108c) Drag your code file named microbit-1-2-3.hex to the MICROBIT(D:) folder to upload your code to your micro:bit. Test your micro:bit by pressing Button A, then Button B then both button A and button B at the same time. ##