Embedded Systems Today Introduction to Mechatronics Microcontroller Input

Embedded Systems

Today • Introduction to Mechatronics • Microcontroller – Input / Output Ports (I/O) – Memory – ADC – PWM

Introduction to Mechatronics http: //en. wikipedia. org/wiki/Mechatronics_engineering

Embedded Systems • Special-purpose computer system designed to perform one or a few dedicated functions, often with real-time computing constraints. • Usually controls a device • Often meant for harsh environments • Designed to be optimized, reducing the size and cost of the product, or increasing the reliability and performance. • The Mun’der board is a embedded system

Microcontroller • A microcontroller or embedded microprocessor is essentially a computer-on-a-chip. • They are used in everyday electronic devices, such as cellular telephones, household appliances, automobiles, etc. • In contrast to general-purpose microprocessors (the kind used in a PC) they are self-sufficient and cost-effective. • Anywhere you want to give a design a small amount of ‘intelligence’, or the ability to generate different outputs based on the given inputs. • Allows the system to be highly flexible

Microcontrollers PIC 18 F 4550 Microcontroller

Microcontroller

Microprocessor • The ‘brains’ of the microcontroller • Carries out programs instructions • Performs arithmetic and logic operations

Memory • ROM - Read only Memory – Non-Volatile - Data retains in memory even when its power supply is removed. • RAM - Random Access Memory – Volatile - Data is lost when the power supply is removed. • Flash RAM – Random Access Memory • EEPROM - Electrically Erasable Programmable ROM • Used for instruction set, programs, variables.

Microcontrollers - I/O • There are 5 input/output (I/O) ports on the PIC 18 F 4550 microcontroller – Labeled A through E – The ports are Bi-directional, can accept input signal or send out a output signal – TRISB = 0 x 00; • 0 – Output • 1 – Input • Note: Don’t use A 6 as I/O

And Operation (Side Note) • Denoted by a ‘&’ • Used to single out bits of a port

Microcontrollers - I/O • Input char var = PORTB & 0 x 01 • Output LATBbits. LATB 0 = 1; LATB = 0 x 00;

Microcontrollers - ADC • ADC - Analog to Digital Convertor • Class Notes • 10 -bit ADCs on the PIC 18 F 4550 microcontroller, on 13 channels • Code - Right Turn