1. RASPBERRY PI
Using the GPIO port
Seggy T Segaran
SF Innovations

2. LAYOUT OF THE BOARD
GPIO header
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3. COOL PROJECTS USING THE GPIO PORT
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RaspiRobot

4. COOL PROJECTS USING THE GPIO PORT
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One button audiobook player – for visually impaired

5. COOL PROJECTS USING THE GPIO PORT
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Ladder Game “Gordon's Projects”

6. www.sf-innovations.co.uk
LAYOUT OF THE GPIO PINS

7. SUMMARY OF PINS
 Power – 3.3V, 5V and 0V
 General purpose digital inputs/outputs – 8 pins
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 I2C – 2 pins
 SPI – 5 pins
 UART – 2 pins
 Not used – 6 pins
 Total – 26 pins

8. POWER
 Useful to power external circuits
 Limit maximum current draw to < 100 mA on 5V pin
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 Limit maximum current draw to <50 mA on 3.3V rail

9. GENERAL PURPOSE DIGITAL INPUTS/OUTPUTS
 Outputs used to control external circuits
 Switch leds on/off
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 Switch relays on/off
 Actuate solenoid
 Inputs used to monitor status
 Read switch status
 Alarm inputs
 Logic high on input/output is 3.3 V
 Logic low on input/output is 0 V
 Voltages > 3.3V on any pins can result in damage

10. I2C
 Used to interface to a variety of ICs
 Output expanders – for more digital outputs
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 Input expanders – for more digital inputs
 Digital to Analogue convertor
 Analogue to Digital convertor
 Oscillators

11. SPI
 Used to interface to a variety of ICs
 Flash memory
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 Output expanders – for more digital outputs
 Input expanders – for more digital inputs
 Digital to Analogue convertor
 Analogue to Digital convertor
 Oscillators

12. UART
 Used for serial data input and output
 Talk to external peripherals using
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 RS232
 Modbus

13. NOT USED
 Must not connect to these pins
 Eben Upton says in his book
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“Never connect anything to the pins marked Do Not
Connect”. These are reserved for internal functions
of the Pis BCM2836 hardware. Connecting
anything to these pins will result in damage to the
Pi”

14. PRECAUTIONS WITH GPIO PINS
 Permanent damage can be caused to the
Raspberry Pi by:
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 Connecting a 5V supply to any pin
 Shorting the 3.3V or 5V supply pins to any other pin
 Arduino (5V) devices connected to the Pi (3.3V)

15. ACCESSORIES FOR THE GPIO PORT
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Slice of Pi – from Ciseco
Supplied in kit form Slice of Pi features a small prototyping
area and plugs into the 26 pin GPIO header.

16. ACCESSORIES FOR THE GPIO PORT
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Adafruit – Prototyping Pi Plate
Provided in kit form and provides a full size prototyping area.
Screw terminals are provided as well as provision for soldering a
surface mounted IC.

17. ACCESSORIES FOR THE GPIO PORT
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The Gertboard
Connects via a ribbon connector and provides the following:
12 buffered I/O ports, 3 push button switches, 6 open collector drivers, 48V,
4A motor controller, 2 channel digital to analogue convertors,
2 analogue to digital convertors. It also allows for a 28 pin microcontroller.

18. ACCESSORIES FOR THE GPIO PORT
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Adafruit Pi Cobbler
A quick way to actually make the connections to the Raspberry Pi

19. ACCESSORIES FOR THE GPIO PORT
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Sk Pang – Starter kit for Raspberry Pi
This is a basic kit components that enables you to control LEDs,
reading status of switch on your Raspberry Pi.

20. ACCESSORIES FOR THE GPIO PORT
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PIFACE digital board
Supplied assembled with
2 Changeover relays, 8 Open-collector outputs, 8 Digital inputs
8 LED indicators, 4 Switches

21. ACCESSORIES FOR THE GPIO PORT
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Custard Pi 1 – protection layer for the Raspberry Pi
Plug in board providing protection for all the pins as well
screw terminal connections with labels.
Multifuse and leds on both power rails

22. ACCESSORIES FOR THE GPIO PORT
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Custard Pi 2 – General purpose I/O board for the Raspberry Pi
Plug in board with 4 open collector digital outputs, 4 inputs,
2 analogue outputs and 2 analogue inputs.
Multifuse and leds on both power rails.

23. FURTHER APPLICATIONS FOR THE GPIO PORT
 Industrial Control
 Test instrumentation
 Building control
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 Home Automation
 Switching appliances on/off
 Reading temperature
 Monitoring energy usage
 Security

24. GET LEARNING
 Raspberry Pi User Guide
 Eben Upton, Gareth Halfacre
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 Programming the Raspberry Pi
 Simon Monk
 Learn Raspberry Pi with Linux
 Peter Membrey and David Hows
 Learn Electronics by using the Raspberry Pi as a
Controller
 Seggy T Segaran – Launch in May 2013

25. SUMMARY
The low cost of the Raspberry Pi, coupled with
low power, small footprint, Internet connection
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and the GPIO port makes it a powerful tool for
many applications.

26. FINALLY - GET CREATING
The true sign of intelligence is
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not knowledge but imagination.
Albert Einstein

27. BLOG WITH UP-TO-DATE PROJECT INFORMATION
http://mistertee-talks-electronics.blogspot.co.uk/
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