Discovery Lab School of Computing & Information System Florida International University

» First Day Lecture Review » Introduction to Embedded Systems » Digital I/O » Serial Communication » Lunch » Discovery Lab Tour » Analog I/O » Practice » Q&A

» Raspberry Pi » Python

» 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.

» Consumer electronics » Automobiles, » Transportation systems » Medical equipment » Wireless sensor networking » Home Automation

» Better Performance » More GPIOs » Accelerometer and Capacitive Slider Sensor » One RGB LED » Open SDA (Open-standard Serial and Debug Adapter)

» Login ID : team00 » Password : pw00team » Plugin FRDM Board to USB port on PC Plugin FRDM Board to USB port on PC » » »

» #include "mbed.h" » DigitalOut myled(LED1); » int main() { » while(1) { » myled = 1; » wait(0.2); » myled = 0; » wait(0.2); » } * Try to change wait time

» 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)

Bus (power line) Vertically 5 pin Connected Vertically 5 pin Connected

» Busser ˃Pin (-)  (e, 1) ˃Pin (+)  (f, 6)

» Ground & Power line Connection Dual Motor Driver Voltage Regulator LED

» Power Connection between Bread Board and FRDM Power & Ground

» Power Connection between Bread Board and FRDM Power & Ground

» Connect 4 LEDs » White  PTC5 » Green  PTC6 » Yellow  PTC10 » Red  PTC16

» Make LEDs blink with below patterns » Make a led-control program which can control 4 leds with different blinking time ˃Using if else ˃Using switch case WRYG

» #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

» What is it? ˃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

» Applications ˃Fans ˃Pumps ˃Robotic Servo ˃Stepper Motor ˃Telecommunication

#include "mbed.h" PwmOut led(LED1); int main() { while(1) { for(float p = 0.0f; p < 1.0f; p += 0.1f) { led = p; wait(0.1); }

#include "mbed.h" PwmOut led(LED1); int main() { while(1) { for(float p = 0.0f; p < 1.0f; p += 0.1f) { led = p; wait(0.1); }

#include "mbed.h" PwmOut led(LED1); int main() { 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

#include "mbed.h" AnalogIn ain(p19); DigitalOut led(LED1); int main() { while (1){ if(ain > 0.3) { led = 1; } else { led = 0; } } * Try to connect Buzzer and change delay

#include "mbed.h" AnalogOut signal(p18); int main() { 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

» Dual-H-bridge 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

» Input 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.