CH25-D - Servo Selector List

The 270 Degree Servo Motor has a 3-wire connector on the end that can plug directly into the pins on the back of the Bit Board.

Make sure the Orange Wire is closest to the number 13 for the Pin 13 column.

Then the Brown Wire should be closest to the micro:bit (in the - row) and the Red Wire will be in the middle (the +5v row).

Connect the Button with Maker Tape, with one side to Pin 5 and the other to GND.

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 Servo Selector List program: https://makecode.microbit.org/_VCrCAx3a0...

This time instead of just selecting a random number we'll pull a number from a predefined list. This allows us to choose between a set of specified numbers.

We can use our pick random to select one of the 5 values by choosing a random number between 0 and 4.

Remember that when we start at 0 we include it as a value, so 0 to 4 is five options.

We use the term "list" for our collection of numbers but the term array can also be used, and in most programming languages the two terms are interchangeable.

Once the code is loaded it should start running immediately, but the servo won't move until you press the button.

You can power the micro:bit via the USB cable you used to load the code, but now that we are using servos we recommend using a battery pack plugged into the Bit Board.

The Blue Pins on the Bit Board provide extra power (5 volts instead of 3 volts) by boosting the voltage coming from the battery pack. This helps improve servo performance, especially with multiple servos.

When the button is pressed the servo will move to a position. It may not move if the same (random) position is selected more than once in a row.

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/live/Og8T6cw5Ai0