Embedded Systems

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

Introduction to Mechatronics

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 PIC18F4550 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 PIC18F4550 microcontroller –Labeled A through E –The ports are Bi-directional, can accept input signal or send out a output signal –TRISB = 0x00; 0 – Output 1 – Input Note: Don’t use A6 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 & 0x01 Output LATBbits.LATB0 = 1; LATB = 0x00;

Microcontrollers - ADC ADC - Analog to Digital Convertor Class Notes 10-bit ADCs on the PIC18F4550 microcontroller, on 13 channels Code - Right Turn