Raspberry Pi KKKL 3234 System Design (Rekabentuk Sistem)

Raspberry Pi KKKL 3234 System Design (Rekabentuk Sistem)

KKKL 3234 System Design
(Rekabentuk Sistem)
Raspberry Pi
Anuar Mikdad Muad
([email protected])
Department of Electrical, Electronic and Systems Engineering,
Faculty of Engineering and Built Environment,
Universiti Kebangsaan Malaysia,
43600 UKM Bangi,
Selangor, MALAYSIA.
Raspberry Pi
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Small computer (~ size of a credit card).
Cheap
HD quality video (can even play 3D games)
ARM processor.
Linux
Python, C, C++.
Anuar M. Muad, Universiti Kebangsaan
Malaysia
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Hardware
Anuar M. Muad, Universiti Kebangsaan
Malaysia
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Model A & Model B
Anuar M. Muad, Universiti Kebangsaan
Malaysia
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General Purpose
Input Output (GPIO)
GPIO ports are low powered.
So, an expansion board is
needed to provide high
powered signals to drive
lamps, buzzers, motors, etc.
Anuar M. Muad, Universiti Kebangsaan
Malaysia
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Raspberry Pi Model B 512mb RAM
Raspberry Pi Model A+
Raspberry Pi Model B+
Raspberry Pi Model B+
Component
CPU
GPU
Memory
Specification
700 MHz ARM (ARM11 family, ARM v6 instruction set)
Broadcom VideoCore IV @250MHz
512 MB SDRAM (shared with GPU – the limit of memory used
by GPU can be set using raspi –config utility.
USB 2.0 ports 4
Video output HDMI, composite video (PAL and NTSC) via 3.5 mm TRRS jack
shared with audio out
Analog
Analog via 3.5 mm phone jack; digital via HDMI port
output
Onboard
microSD
storage
Networking 10/100 Mbit/s Fast Ethernet, no onboard Wi-Fi or Bluetooth
Power
600 mA (3 W), 5 V
GPIO
40 pins
HDMI
DVI-D
VGA
SCART
RCA
NOOBS Setup
• NOOBS (New Out Of the Box Software)
• Operating system install manager for the Raspberry Pi.
* For beginners
Other Operating System
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RASPBIAN
SNAPPY UBUNTU CORE
OPENLEC
RASPBMC
PIDORA
RISC OS
* For advanced users
Raspberry Pi Model B+
40 pins
26 digital I/O
UART, I2C, SPI
GPIO in Python
Analog Input
MCP3008
8-channel 10 bit ADC with SPI
SPI data pins:
DOUT, CLK, DIN, CS
Sensors
Round Force-Sensitive Resistor (FSR)
• Detect physical pressure, squeezing,
& weight.
• Cheap.
• When pressed, resistive values
change.
• Not so accurate.
Temp oC = 100*(reading in V)-50
TMP36 – Analog temperature sensor
Reading analog sensor
Reading analog sensor using MCP3008
Interfacing
• 1-wire interface
• I2C interface
• SPI interface
I2C Interface
SPI Interface
• Enabling SPI interace on the Raspberry Pi
• Analogue Sensors using MCP3008
Enabling SPI interface on the Raspberry Pi
PINs 19, 21, 23, 24, & 26
sudo raspi-config
sudo reboot
References
1.
http://www.raspberrypi.org/
I/O Interface
Current sourcing
Current sinking
LED Interface
LED 2V
VO 2 V
R
10 mA
5 VO 2 V
10 mA
330
Connecting LED in a
current source mode
Connecting LED in a
current sink mode
Relay Interface
Driving an inductive load
Driving a mains bulb using a relay
Button input
Active low-button input
Active high-button input
Transistor input
Transistor input
Microcontroller Power Source
Basic Hardware Setup
Simple flashing LED
MikroC
library
Turning odd numbered LEDs
7 Segment LED
7 Segment LED
Pseudo-code
Programme
Liquid Crystal Display (LCD)
HD44780
LCD
Analog input with LCD display
Pseudo-code
Universal asynchronous receiver transmitter (UART)
Sending character “A” in serial communication
In ASCII, A = 01000001
9-way and 25-way RS232 connectors
Universal asynchronous receiver transmitter (UART)
Connecting Microcontroller to PC
Universal synchronous asynchronous receiver transmitter (USART)
Pseudo-code
HyperTerminal
Instrumentation Amplifier Interface
Power Outputs Interface
Motor Interface
Speed & position control
Electronic Control of DC motor
Pulse width modulation (PWM) of a DC motor
PWM velocity feedback control
PWM voltage and motor current
H-bridge drive for DC motor
DC motor position and speed control
Servomotor
Digital Position Control System
Motivation
The current health care system is faced with several challenges:
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Lack of professional health care personnel
Insufficient training of medical professionals
Early retirement of senior doctors (and subsequent loss of expertise)
Aging population
Pulse Oximeter using microcontroller
*PPG = Photoplethysmogram
Electronic Tongue for monitoring drinking waters
Multi-electrode
PIC16F877A C based multiple DC motors controller
SLAVE
MASTER
INTERRUPT
IN SLAVE
PWM method
H-Bridge
Two motors run simultaneously at 700
RPM for 30 sec without load.
Two motors run simultaneously without
any sudden load for 25 sec but at
different speeds, motor 1 runs at 650
RPM and motor 2 runs at 1050 RPM.
Two motors run simultaneously without any
sudden load for 123 sec at different speeds and
sudden loads.
Motor 1 runs with speed 850 RPM with sudden
load at 76 sec and load removal at 110 sec.
Motor2 runs with speed 900 RPM with sudden
load at 40 sec and load removal at 100 sec.
Body Sensor Network
Wireless ECG sensor
ECG strap
SpO2 (oxygen Processing
saturation)
unit
sensor