This term in Computing Y8s have been looking at the ways that computers can store, manipulate and display images. Amongst other things, we’ve been using BBC micro:bits to create images, animations and games.
One thing we didn’t get time to look at this term was the data representation of sound.
Maplin (the people who sell all sorts of electronic gadgets and maker kit) have launched a competition where you have to use a BBC micro:bit to create a musical instrument so if anyone’s keen on experimenting over the Easter holidays you can have a lot of fun and possibly win £1,000 worth of gadgets.
This is my entry to the competition, to try to win the maker bundle to share out as prizes at the STEM club I run on Monday lunchtimes at Fulford School, York.
The idea is pretty simple: the latest version of micropython for a micro:bit allows you to write code that will get your micro:bit speaking. You can change the pitch of the speech to make it sound like it’s singing and you can change the speed of the speech to make each word last more or less time.
The code below hooks up the built-in accelerometer to the pitch and speed so that you can tilt your micro:bit to get it singing.
I’ve coded in a series of random Easter messages but you can change the text on line 10 if you want to get it singing your own lyrics.
The singing works in the simulator on create.withcode.uk as long as you’re using chrome, firefox or edge. Sadly, I haven’t made it work in Internet Explorer yet – you can download the audio it generates but it wont let you play it automatically.
Have fun, and see what you can create! But if you use my code and win the £1,000 prize I’ll expect my share of the goodies!
Boolean logic is a way of making decisions based on the answers to one or more TRUE / FALSE questions.
It’s often used in electronic circuits or computer science programming because TRUE and FALSE data can be easily represented by binary 1s or 0s, or by electricity being switched on or off.
Pupils in key stage 3 (aged 11-14) in the UK have to be taught how to:
Understand simple Boolean logic [for example, AND, OR and NOT] and some of its uses in circuits and programming
This is probably the most misunderstood part of the curriculum that – if pressured for time – is perhaps most likely to be missed out from computing schemes of work.
Mr Conroy, from Tadcaster Grammar School, had a brilliant idea for teaching this and he’s kindly agreed to let it be shared here.
Rather than start by explaining what boolean logic, students are encouraged to discover for themselves by pressing buttons on a BBC micro:bit and writing down what they see on the screen.
Students have a worksheet to complete with 6 tables. Each of these tables has space to write down what buttons they’re pressing on a micro:bit and what they see on the screen for that combination of buttons.
This then leads to a discussion about truth tables, where you can look up what the output is going to be if you know what the inputs are.
The next page contains the code you can use to program the micro:bits along with the worksheets students can complete.
It’s been less than a year since I first launched create.withcode.uk to let students and teachers write, run and debug python code without needing to download any software or create any user accounts. Since that time, a new job and new baby have made me fall behind some of the amazing new features added to the micropython runtime for the BBC microbit.
Thankfully, the Christmas holidays have arrived and I’ve now got a little bit of time whilst the boys are asleep – whilst I should be starting on the sack full of marking, reports and lesson prep – to catch up and post some new resources.
I’ve been working on the microbit simulator to let you try out the new speech module in your code. I’ve tested it with firefox and chrome but Internet Explorer doesn’t support web audio so if you’re stuck with using that you can still write and run your code and download it to your microbit but it wont actually speak unless you download the sound file each time your code tries to speak.
Here’s an example program that turns your microbit into a talking dalek that you can tickle by pressing button A:
Have a play and see if you can:
add your own phrases that you’d like the micro:bit to say when you tickle it.
use the API documentation to get the micro:bit to sing a song
find out the maximum length of text that the micro:bit can say. What happens if you try and say more than this?