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Discovery Lab School of Computing & Information System Florida International University . Computer Science for High School . Second Day Schedule. First Day Lecture Review Introduction to E mbedded Systems Digital I/O Serial Communication Lunch Discovery Lab Tour Analog I/O

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Discovery lab school of computing information system florida international university

Discovery Lab

School of Computing & Information System

Florida International University

Computer Science for High School


Second day schedule
SecondDay Schedule

First Day Lecture Review

Introduction to Embedded Systems

Digital I/O

Serial Communication

Lunch

Discovery Lab Tour

Analog I/O

Practice

Q&A


First day lecture review
First Day Lecture Review

Raspberry Pi

Python


Introduction to embedded systems
Introduction to Embedded Systems

  • An embedded system is a computer system with a dedicated function

  • Embedded systems control many devices in common use today

  • Processing Cores

    • microcontrollers or digital signal processors (DSP)

    • ATMega, PIC, ARM, etc.


Variety of embedded systems
Variety of embedded systems

Consumer electronics

Automobiles,

Transportation systems

Medical equipment

Wireless sensor networking

Home Automation


Arduino mbed frdm
Arduino & mBed FRDM

Better Performance

More GPIOs

Accelerometer and Capacitive Slider Sensor

One RGB LED

Open SDA (Open-standard Serial and Debug Adapter)




Mbed frdm board development set up
mBed FRDM board Development Set up

Login ID : team00

Password : pw00team

PluginFRDM Board to USB port on PC

https://mbed.org/handbook/Windows-serial-configuration

http://mbed.org/handbook/mbed-FRDM-KL25Z-Getting-Started

http://mbed.org/handbook/mbed-FRDM-KL25Z-Examples


Digital out

  • #include "mbed.h"

  • DigitalOutmyled(LED1);

  • int main() {

  • while(1) {

  • myled = 1;

  • wait(0.2);

  • myled = 0;

  • wait(0.2);

  • }

  • }

Digital Out

* Try to change wait time


Diode

  • The most common function of a diode is to allow an electric current to pass in one direction, while blocking current in the opposite direction

    • Protect circuits from high voltage surges

      - Avalanche diodes

    • Regulate voltage - Zener diodes

    • Electronically tune radio and TV receivers

      - Varicap diodes

    • Generate radio frequency oscillations

      - Tunnel diodes, Gunn diodes, IMPATT diodes

    • Convert light into either current or voltage

      - Photodiode

    • Produce light - Light Emitting Diodes (LED)

Diode


Led light emitting diode
LED (Light Emitting Diode) current to pass in one direction, while blocking current in the opposite


Bread board set up

Vertically current to pass in one direction, while blocking current in the opposite

5 pin Connected

Vertically

5 pin Connected

Bus

(power line)

Bread Board Set up


Bread board set up1

  • Busser current to pass in one direction, while blocking current in the opposite

    • Pin (-)  (e , 1)

    • Pin (+)  (f , 6)

Bread Board Set up


Bread board set up2

Dual Motor Driver

LED

Voltage Regulator

Bread Board Set up


Bread board set up3

Power & Ground

Bread Board Set up


Bread board set up4

Power & Ground

Bread Board Set up


Bread board set up5

  • Connect 4 LEDs current to pass in one direction, while blocking current in the opposite

  • White  PTC5

  • Green  PTC6

  • Yellow  PTC10

  • Red  PTC16

Bread Board Set up


Try to make patterns

  • Make LEDs blink with below patterns current to pass in one direction, while blocking current in the opposite

  • Make a led-control program which can control 4 leds with different blinking time

    • Using if else

    • Using switch case

W

G

R

Y

Try to make patterns


Computer science for high school

Serial current to pass in one direction, while blocking current in the opposite Communcation

  • #include "mbed.h"

  • Serial pc(USBTX, USBRX); // tx, rx

  • PwmOut led(LED1);

  • float brightness = 0.0;

  • int main() {

  • pc.printf("Press 'u' to turn LED1 brightness up, 'd' to turn it down\n");

  • while(1) {

  • char c = pc.getc();

  • if((c == 'u') && (brightness < 0.5)) {

  • brightness += 0.01;

  • led = brightness;

  • }

  • if((c == 'd') && (brightness > 0.0)) {

  • brightness -= 0.01;

  • led = brightness;

  • }

  • }

  • }

Connect to your mbed Microcontroller with a Terminal program

and uses the 'u' and 'd' keys to make LED1 brighter or dimmer


Pulse width modulation

  • What is it? current to pass in one direction, while blocking current in the opposite

    • Controlling power to inertial electrical devices

    • Average voltage and current controlled by turning switch

  • What for?

    • Modern electronic power switches

    • The main advantage of PWM is that power loss in the switching devices is very low

    • Relatively low cost

Pulse-width Modulation


Pulse width modulation1

  • Applications current to pass in one direction, while blocking current in the opposite

    • Fans

    • Pumps

    • Robotic Servo

    • Stepper Motor

    • Telecommunication

Pulse-width Modulation


Computer science for high school

Pulse Width Modulation current to pass in one direction, while blocking current in the opposite

#include "mbed.h"

PwmOutled(LED1);

intmain() {

while(1) {

for(float p = 0.0f; p < 1.0f; p += 0.1f)

{

led = p; wait(0.1);

}

}

}


Computer science for high school

Let’s Make current to pass in one direction, while blocking current in the opposite a Ticker

#include "mbed.h"

PwmOutled(LED1);

intmain() {

while(1) {

for(float p = 0.0f; p < 1.0f; p += 0.1f)

{

led = p; wait(0.1);

}

}

}


Computer science for high school

Let’s Make current to pass in one direction, while blocking current in the opposite a Ticker

#include "mbed.h"

PwmOutled(LED1);

intmain() {

while(1) {

for(float p = 0.0f; p < 1.0f; p += 0.1f)

{

led = p; wait(0.1);

}

}

}

* Try to connect Buzzer and change delay


Computer science for high school

Analog current to pass in one direction, while blocking current in the opposite In

#include "mbed.h"

AnalogInain(p19);

DigitalOutled(LED1);

intmain() {

while (1){

if(ain> 0.3) {

led = 1; } else { led = 0; }

}

}

* Try to connect Buzzer and change delay


Computer science for high school

Analog current to pass in one direction, while blocking current in the opposite Out

#include "mbed.h"

AnalogOutsignal(p18);

intmain() {

while(1) {

for(float i=0.0; i<1.0; i+=0.1)

{ signal = i; wait(0.0001);

}

}

}

* Try to connect Buzzer and change delay


Computer science for high school

Import Open current to pass in one direction, while blocking current in the opposite Library


Motor driver

  • Dual-H-bridge current to pass in one direction, while blocking current in the opposite motor driver: can drive two DC motors

  • Motor supply voltage: 2–11 V

  • Logic supply voltage: 2–7 V

  • Output current: 1.2 A continuous (1.5 A peak) per motor

  • One PWM and One DigitalOut per DC motor

  • Logic High for Enabling This Driver

Motor Driver


Motor driver1
Motor Driver current to pass in one direction, while blocking current in the opposite


Step up down voltage regulator

  • I current to pass in one direction, while blocking current in the opposite nput voltage: 2.7 V to 11.8 V

  • Fixed 5 V output with +5/-3% accuracy

  • Typical continuous output current: 500 mA to 1 A

  • The SHDN pin can be driven low (under 0.4 V) to power down the regulator .

Step-Up/Down Voltage Regulator


Computer science for high school
Q & A current to pass in one direction, while blocking current in the opposite