CH3-C - LED Blink Randomly

We'll use Maker Tape to connect the LEDs to the Bit Board on a LEGO baseplate.

Connect the Negative (-) sides of the LEDs to a Ground (GND) hole on the Bit Board.

Connect the Positive (+) side of the first LED to Pin 1 on the Bit Board.

Connect the Positive (+) side of the second LED to Pin 2 on the Bit Board.

Connect the Positive (+) side of the third LED to Pin 3 on the Bit Board.

Connect the Positive (+) side of the fourth LED to Pin 4 on the Bit Board.

You'll notice the Ground on the Bit Board (as well as the LED and other Crazy Circuits components we'll use) is color coded White.

If you've never used a micro:bit before you'll want to check out this guide: Bit Board V2 Setup and Use

We're going to load the following code for our LED Blink Randomly program: https://makecode.microbit.org/_bJ3PCuadw...

This code will generate a random number between 1 and 4 and then light up the corresponding LED. It will then turn off all of the LEDs and repeat the process.

At the beginning of our forever block we use a set to function and then add a pick random function to it. We then use an if then block to turn on the specific LED.

Finally, we'll use a math function to do some simple division in the last line of the forever block.

You'll notice we have a command for led enable set to false in the on start block. The led enable command enables or disables the built-in LED matrix on the front of the micro:bit

We need to turn off the built-in LED matrix to properly use Pin 3 and Pin 4 otherwise they will be used by the built-in LED matrix and conflict with our code to control our LEDs.

You can see a description of the micro:bit pins here: https://makecode.microbit.org/device/pin...

Once the code is loaded it should start running immediately.

You can power the micro:bit via the USB cable you used to load the code or you can use a battery pack plugged into the Bit Board.

The code will start by choosing a random number between 1 and 4 and then using the if them block will it will turn on the appropriate LED, then turn it off, and repeat.

In future guides we'll use four LEDs along with sensors or other input to act as a small bar graph or level indicator.

Follow along with our recorded Live Stream!

You can watch the full video of us walking through this project, along with explaining and exploring the code: https://www.youtube.com/watch?v=_ArsMH4A...