This Slide Show contains info on using Scratch on Raspberry Pi and Berry Clip. The Case Study video explains the project: https://youtu.be/RshEjqaK4gQ The presentation contains lots of useful scripts and tips on getting things working.

1. ScratchGPIO, Raspberry Pi &
BerryClip
KS2 Starter Guide to Physical Computing
Sense and control the physical world using computer programs running on the
Raspberry Pi. Here you will learn how easy it is to interact with the outside world, and
how this opens up limitless possibilities for exploration. A wide range of sensors,
motors, robots and USB devices can be connected.
https://www.cl.cam.ac.uk/projects/raspberrypi/tutorials/robot/

2. Getting Started
• https://www.cl.cam.ac.uk/projects/raspberrypi/tutorials/robot/getting_started/

3. https://www.raspberrypi.org/guides/teachers/

4. https://www.raspberrypi.org/resources/teach/

5. Desirable features Interactive Design

6. Scratch and BerryClip
http://www.rpischool.org.uk/?p=114
A simple way for primary school aged children to control
lights, a buzzer and use a physical button with their
scratch programs.
+
+BerryClip
Raspberry Pi
BerryClip plugs directly onto the Raspberry Pi’s GPIO header
and provides 6 coloured LEDs, 1 Buzzer, 2 Switches and a 13 pin
header. It can be controlled using any programming language
that can manipulate the GPIO pins and this includes Python
and C.
GPIO

7. ScratchGPIO: How to install on your Raspberry Pi
A modified version of Scratch called ScratchGPIO is needed to be able to connect to the BerryClip.
The following are instructions to install ScratchGPIO7 software on Raspberry Pi
• With Raspberry Pi connected to Internet
Copy the text below ( left click just before the s of sudo and drag right until all the text in the line as been selected) then right-click
and select copy. Open up an LX Terminal window and select Edit and the Paste that into an LX Terminal window and press Enter it to
download the installer.
wget http://bit.ly/1wxrqdp -O isgh7.sh
Once the installer has been downloaded then just type (or copy and paste the text below as before)
sudo bash isgh7.sh
and press Enter
(If logged in as a different user to standard pi, then type sudo bash isgh7.sh yourusername) This will install all the necessary extra
software and some simple examples.
http://simplesi.net/scratchgpio/scratch-raspberrypi-gpio/

8. •With Raspberry Pi not connected to Internet.
Power down you Pi and put the SD card into another computer and download this file
http://bit.ly/1wxrqdp
and copy it to your SD card.
Put the card back into your Pi and then open up an LX Terminal window and type the following
sudo bash /boot/install_scratchgpio7.sh
(If logged in as a different user to standard pi, then type sudo bash /boot/install_scratchgpio6.sh yourusername) This will
install all the necessary extra software and some simple examples.
The installer will create 2 desktop icons – ScratchGPIO7 which is used for beginners using simple circuits and ScratchGPIO
7Plus which is used with a lot of add-on boards.
Continue onto 1st Project
http://simplesi.net/scratchgpio/scratchgpio-1st-project/
ScratchGPIO6 was the previous version – if you need a copy of it – then click here

9. http://cymplecy.github.io/scratch_gpio/

10. Raspberry pi installation
• https://www.raspberrypi.org/documentation/installation/noobs.md

11. Use ‘Broadcast’ to control lights
• ScratchGPIO Run the
special Scratch icon
(ScratchGPIO) on your
desktop.
• To test out control from
Scratch, click on File then
Open and then click on
the My Projects button
and select blink11 and
click on OK. Once the
project opens, just click on
the OK to enable Remote
Sensor Connections. To
run the script just click on
the Green Flag.
Your LED should now blink on for 1
second and off for 2 seconds
(Play Video below to see)

12. Turn on all the BerryClip LED lights
The LEDs have a Hardware
Reference:
Use this reference in ScratchGPIO:
or = LED on
or = LED off
(All the LED’s are on)
(GPIO pin numbers/ordering do not follow anything that makes
sense to most people so you just have to go with the seemingly
random numbering arrangement)

13. • As you can see in the blink11 script ,
you can simply use a broadcast
message telling Pins to go on or off
(Up to 3.3V and down to 0V) The valid
messages are along with the
corresponding pin off messages.
You can also say And you can replace the word on with high and
replace off with low if you want to talk in pure logic levels.
Play video:

14. Using variables instead of broadcasts
For more advanced Scratchers, you can use variables instead (or as well as broadcast messages)
A broadcast allows a signal to everything with the ‘When I Receive’ to be broadcasted, and it allows different objects to do different
things all at the same time.
A custom block is a ‘Shortcut’ to a command. For example, pressing Ctrl+X cuts something much like a string of custom commands
created by you using custom blocks.
Custom Block - Allows you to create a new block which you can use in the sprite in which it is defined
Broadcast - Sends an event so all the corresponding when I receive scripts will start running
Edit: OK a broadcast can be used to replace a custom block. The custom block makes things much easier by having parameters. The
custom block also has run without screen refresh which broadcast cannot do.
• For example: create a global variable called pin11
• To make pin11 go on or off, set it to;
• ‘1’ = on
• ‘0’= off

15. Variables to control the GPIO’s (General Purpose In and Out)
Hardware
Reference
The following list shows
the mapping between the
components, the header
pins and the GPIO
references :
LED 1 - Pin 7 - GPIO4
LED 2 - Pin 11 - GPIO17
LED 3 - Pin 15 - GPIO22
LED 4 - Pin 19 - GPIO10
LED 5 - Pin 21 - GPIO9
LED 6 - Pin 23 - GPIO11
Buzzer - Pin 24 - GPIO8
Switch - Pin 26 - GPIO7
Make a variable for each of
the LED lights.
For example: To control the
first RED LED (LED 1) the
Hardware Reference for LED-1
is Pin 7.
Go to ‘Variables’. Click on
‘Make a variable’ call it ‘pin7’
Drag the ‘set pin7 to 0’ block
to the Sprite Script.
Create variables like this for all
the LEDs. Use the Hardware
Reference as a guide.
To turn a LED on set it to ‘1’
To turn it off set it to ‘0’

16. Make LED light pattern
• Once you know how to turn on an off the LED’s you can easily start to
write your own sequences.
This piece of script
when I press ‘space’
will create a looping
light cycle.

20. Try your own combinations of flashing lights
• Use either ‘Broadcast’ or ‘Variable’ method to create your own light
patterns, turning on and off the individual LED’s.
• Which method is easier?
• Use ‘wait’ block to vary the length of time a light stays on.
• Use ‘forever’ block to loop the pattern.
• Save your work.

21. Traffic lights sequence (Simple)
Lights go off in pairs in sequence like traffic lights

22. Traffic Lights Sequence
When flag is clicked it goes to green. Press Space to start sequence. Print PCB?

23. GPIO Example: control LED’s using keyboard
Ways to control LED’s using keyboard input with either
‘broadcast’ or a ’variable’.

24. GPIO Game BerryClip
• A simple game that uses Scratch GPIO extensions to play.
• The 3 LED’s display health/ lives of the cat
• Use buttons or arrows to move the cat up and down to avoid Rex. Be
careful, he gets faster!

25. LED Health Bars -Raspberry Pi, BerryClip,
ScratchGPIO
http://computers.tutsplus.com/tutorials/learn-how-to-use-
raspberry-pi-gpio-pins-with-scratch--mac-59941

26. Random ‘Crazy’ Lights GPIO

27. Disco lights
• http://pdwhomeautomation.blogspot.co.uk/2013/04/raspberry-pi-
scratch-gpio-disco-lights.html

28. Allpins on/off
• To set all outputs to on or off use
• For a complete list of all commands that ScratchGPIO understands
see here.

29. Robot Antenna project Raspberry Pi, Scratch and Breadboard
https://www.raspberrypi.org/learning/getting-started-with-scratch/worksheet/
Robot on Scratch linked with ‘Real’ robot

30. Pi, Breadboard, Scratch

31. Pi, Breadboard, Scratch

32. SWEET SHOP REACTION GAMEhttps://www.raspberrypi.org/learning/reaction-game/

33. http://www.dmict.co.uk/programming-using-a-raspberry-pi-berryclip-and-scratchgpio/
•
The 3 projects are:
1. Creating a ‘scanning’ LED sequence (Think KITT’s lights from the TV show ‘Knight
Rider’).
2. Creating a Morse code generator using the Berryclip’s buzzer.
3. Creating a working die using the 6 LEDs that is triggered by the on-board switch.
• A guide for creating these mini-projects can by downloaded from the link below, the
Scratch project files can be downloaded for modification from my Scratch page and
demos of the 3 projects are embeded below.
• 3 Raspberry Pi Berryclip mini-projects documentation

34. Simplesi website have the basics…
• http://simplesi.net/scratchgpio/scratchgpio-1st-project/
• I’m using this website as reference but have changed it slightly as I’m
using the BerryClip and not a Breadboard.

35. 1st BerryClip project
Control the ‘Traffic Lights’ Manually
Remote Sensor Connections (RSC
Scratch uses this RSC feature to talk to external
devices over a network. To enable this in scratch, go
the ‘sensor’ blocks, then right click on either of the
last two blocks to find a menu item called ‘Enable
remote sensor connection’. Your scratch program
will remember this setting when you save your
scratch file. RSC has two main types of
communication:
• Broadcast messages
These are simple messages that can be sent and
received over RSC. e.g.’led1on‘
• Sensor-updates
These are special messages that pass a value
associated to a changing sensor input or
variable. These sensor updates are only sent when
a variable or sensor’s value has changed. The
berryclip push button is a simple sensor, when
pressed a value of 1 is sent, on releasing the button
a value of 0 is sent.
You should at this point be using
ScratchGPIO on your Raspberry Pi
with the BerryClip attached to it.
Now you must enable
ScratchGPIO to talk to the
BerryClip;
In Scratch, go to the ‘sensor’
block, then right click on either of
the last two blocks to find a menu
item called ‘Enable remote sensor
connection’.

36. SCRATCH INTERFACE DEVICE (SID
• use Scratch on a desktop/laptop PC and get it to remotely control the
GPIO pins via a WiFi connection.
HTTP://SIMPLESI.NET/SIDRPI/

37. Berry Bookies – A Horse Racing Game For The BerryClip
• http://www.raspberrypi-spy.co.uk/2014/01/berry-bookies-a-horse-racing-game-for-the-berryclip/

38. Raspberry Pi and Berry Clip
http://www.rpischool.org.uk/?p=114
• BERRYCLIP PLUS INSTRUCTIONS
• The BerryClip+ is an enhanced version of the popular BerryClip add-on board. It is a simple, cheap and easy
to use addition to the Raspberry Pi. It plugs directly onto the Pi’s GPIO header and provides 6 coloured LEDs,
1 Buzzer, 2 Switches and a 13 pin header. It can be controlled using any programming language
that can manipulate the GPIO pins and this includes Python and C.
• The 13 pin header allows additional components and sensors to be added.
• The kit includes the following parts :
• – 1 PCB
– 1 26-way header
– 1 13-way header
– 2 Red LEDs
– 2 Yellow LEDs
– 2 Green LEDs
– 1 Buzzer
– 2 Switches
– 6 330 ohm resistors
– 2 1K ohm resistors
– 2 10K ohm resistors
– 1 Rubber bumper

39. Pin Pattern
• To use a “bit-pattern” to set/unset multiple outputs simultaneously
use (this will set Pin 11 , Pin 13, Pin 16 and
Pin 18 on and Pins 12 and 15 off)

40. 25 fun things to do with a Raspberry Pi
• http://www.cnet.com/uk/how-to/25-fun-things-to-do-with-a-raspberry-pi/
• https://pihw.wordpress.com/lessons/rgb-led-lessons/rgb-led-lesson-2-scratch-gpio-getting-started/
• http://www.ncl.ac.uk/computing/outreach/resources/primary/primary-conf-2014/resources/w2.4.pdf
• http://www.adafruit.com/

41. VGA Adaptor
• http://www.bloglovin.com/blogs/raspberry-pi-spy-
5426543?post=4101956151&group=0&frame_type=a&context=&context_ids=&blog=5426543&frame=1&click=0&user=0&viewer=true

42. Broadcast v custom block

44. Custom build an enclosure digital fabrication
https://github.com/diy-electronics/raspberrypi-b-plus-case

45. How To Create A Raspberry Pi Video Capture Unit
– Part 1
• http://www.raspberrypi-spy.co.uk/2014/11/how-to-create-a-
raspberry-pi-video-capture-unit-part-1/

46. http://uk.rs-online.com/web/b/raspberry-pi/?cm_mmc=UK-PPC-0914-_-google-_-2_UK_EN_LS_Raspberry_Pi_BMM-_-b7b28a6f-48dd-4d1c-91b5-
51884f7b1082&gclid=CIbki8_YxsgCFQUewwodaHQHFA

47. http://www.bitsbox.co.uk/

48. Where to buy a BerryClip
I bought my BerryClip + (the '+' version is red and has an extra switch button) from DAwn Robotics:
http://www.dawnrobotics.co.uk/brands/Raspberry-Pi-Spy.html
Also recommended outlets are:
https://www.modmypi.com/search/?search=berryclip
and:
https://www.m.nu/berryclip-addon-p-767.html

49. Berry Clip and more Pi Shoppinghttp://www.modmypi.com/raspberry-pi

50. Websites
• http://www.raspberrypi-spy.co.uk/

51. Melting ice cube game