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Turn your micro:bit into the Robot Wars announcer

Three... Two... One... Activate!

Fans of Robot Wars both new and old recognise that deep booming voice of the arena announcer.

Whether its introducing a team of roboteers, starting the match or calling "Cease!", the voice is a key part of Robot Wars. Things wouldn't feel the same without it!

In this activity, we're going to show you how to turn your BBC micro:bit into the arena announcer, thanks to a fun new addition to the Python Editor: A speech synthesiser!

Step 1: The Mu Editor

This activity uses Python, but not our regular Python Editor. The Speech Synthesiser is a special function of the Mu Editor, which you can download from our Software Tools page.

If you're not familiar with using Python on your micro:bit, take a look at the MicroPython micro:bit guide.

To make your micro:bit speak, we're going to need speakers to attach to your micro:bit. A pair of headphones and some crocodile clips will do the trick! You can find out how to connect headphones to your micro:bit here.

Step 2: micro:bit's First Words

Open the Mu Editor.

To do most cool micro:bit things, you'll need to import the correct modules. Call the 'microbit' module and 'speech' module:

from microbit import*
import speech

There are two ways to make your micro:bit talk:

  • speech.say() - Your micro:bit will say the string inside the brackets. The synthesiser has been designed to use English pronunciations, but it's not quite perfect.
  • speech.pronounce() - Similar to speech.say, your micro:bit will read the string inside the brackets, but instead of looking for specific voice sounds or 'Phonemes'. There's a full list of phonemes that the micro:bit can understand on the Python Guide.

Give it a try! You can make your micro:bit say the announcer intro like this:

speech.say("Three, two, one. Activate.")

Step 3: Making it sound perfect

If you run the script you've written so far, it doesn't sound quite right. We can give commands that change the 'voice' of the micro:bit speech. A live of speech with voice controls looks like this:

speech.say("Hello", speed=30, pitch=150, throat=70, mouth=200)

Those four settings can be given a number between 0 and 255 and will do the following effects:

  • Speed: How fast or how slow the speech is.
  • Pitch: How high and squeaky or low and croaky the voice is.
  • Throat: How relaxed or tense the voice sounds.
  • Mouth: Whether the voice is mumbling or pronouncing everything clearly

Also, you can tell the micro:bit to pronounce words exactly as you'd like, using 'speech.pronounce' and this pronunciation guide. It's fiddly, but the end result will sound much clearer. Try this out:

speech.pronounce("THRIYIY. TUX. WAHN. AEKTIHVEYT.", speed=100, pitch=90, throat=110, mouth=105)

Step 4: Putting it all together

Once you've got your speech the way you like it, why not map the speech to the A and B buttons, so you can play them on command?

You can download our version of the Robot Wars Announcer .hex file here. You can flash the file straight to your micro:bit, or open the .hex file in the Mu editor to edit the contents.

Once you've experimented a bit and got the hang of things, why not try these:

  • Change up the voice style to something totally different! Can you make the announcer sound younger and more excited?
  • Can you put in a countdown on the LEDs to match the spoken countdown? Tou may need to split up the speech into smaller chunks and hange the LEDs after each part.