1. Traffic light programming challenges
11/19/2018
Raspberry Pi with Pibrella
Neil Rickus, Senior Lecturer in Computing Education, University of Hertfordshire
@computingchamps
Traffic light programming challenges
Written by Neil Rickus. Licensed under CC BY-NC-SA 4.0 1 1

2. Objectives Sequence instructions Use selection (if, then, else)
11/19/2018
Objectives
Sequence instructions
Use selection (if, then, else)
Use repetition
Make lights flash and buzzers sound
Push the big red button! 2 2

3. 11/19/2018
Your challenge!
Swarco, the world leader in LED traffic lights, need some new engineers
A selection of their products can be seen on the following slide… 3 3

5. 11/19/2018
Your challenge!
Swarco are looking for some new traffic light engineers and want to know if you’re up to the task
Can you complete their programming challenges? 5 5

6. Your computer for today…
11/19/2018
Your computer for today…
What do you notice about the computer in front of you? 6 6

7. 11/19/2018
Getting started
We're going to be using Scratch to program the Pibrella, which is connected to the Raspberry Pi
Firstly, we need to start the GPIO (General Purpose Input Output) Server
We'll then turn on the red light
These commands are case sensitive, so check you use of lower and upper case (capital) letters carefully 7 7

8. 11/19/2018 8 8

9. Challenges - Lights Program a key to turn the red light off
11/19/2018
Challenges - Lights
Program a key to turn the red light off
Program a key make the red light flash
Program a key to make the yellow light flash
Program a key to make the green light flash
Program a key to turn all lights off!
Program a key to make the traffic light sequence 9 9

10. 11/19/2018 10 10

11. 11/19/2018
Big red button
We're now going to program the Big Red Button to make things happen...
We'll start by making it turn a light on
Please hold the board by the side as you press the button! 11 11

12. 11/19/2018 12 12

13. 11/19/2018
Challenges
Make the green light always on unless the big red button is pushed
Make the big red button work light a pedestrian crossing... 13 13

14. Buzzer Can you make it beep? You'll need to broadcast this command:
11/19/2018
Buzzer
Can you make it beep?
You'll need to broadcast this command:
buzzer1000
buzzer0 (to make it stop!) 14 14