Lecture 1: Course Introduction Overview of Computers and their Applications in MAE B Burlingame 3 February, 2016 Heavily based on work by Dr. Buff Furman, SJSU

The Plan for Today Welcome to ME 30 Learning objectives Highlights from the syllabus (aka, ‘greensheet’)   Overview of computers and their applications in MAE   Data Types and Variables Binary representations of phenomena Bit, Bytes, and numbering schemes Base conversion

My Background Industry experience  Microsoft Corporation – Principal Hardware Engineer Consumer Electronics Development UltimateTV Xbox Xbox 360 Kinect Xbox One, Kinect II HoloLens Surface Book California Native  Grew up in Manteca, CA (one of those places where they still grow food) Personal  Hobbies: build things, fix things, literature, cycling, scuba diving Why Engineering?  Engineering is the highest form of creation open to man. We get to harness the possibilities crafted by science to creatively enhance life’s experience Why am I in this class in the middle of a work day?  To help foster as many awesome engineers as possible  The more brains we have to create a more interesting world, the more interesting the world shall become

Syllabus Highlights and Where to Find Things Syllabus available at  ex:  Office Hours TBD Course information  Course goals and learning objectives  Textbook Programming in C (4th Edition) by Stephen G Kochan  Lab Kit Needed this week  Policies and protocol  Grading  Resources  Course schedule Back

Announcements Homework 1 posted tonight, due in two weeks in class  Generally, two weeks per homework covering the lesson of the day and the following week’s lesson All homework and labs should be printed and a hardcopy turned in, a digital copy should be turned in to instructure If you have a laptop, bring it to lab

Focus of ME 30 Solving problems with computers  Learn the process for formulating a computational solution to a problem  Practice the process Gain familiarity with other software used by MEs and AEs for technical computing  Matlab  Excel Learn structured programming using the C language  Get prepared for learning about mechatronics

Where and How are Computers Used in MAE? 1 Technical and Personal Communication   Word processing (reports, procedures, etc.)  Presentations  Conferencing Computation and Analysis  Arithmetic  Equation solving  Data analysis and visualization  Multiphysics and numerical modeling sin(r)/r

Where and How are Computers Used in MAE? 2 Design  Solid modeling (ME 165)  Finite Element Analysis (FEA) (ME 160)  Dynamic modeling and simulation (ME 147, ME 187, ME 190)  Design tradeoffs and analytical modeling of mechanical components and systems (ME 154, ME 157) Gathering Information  Web searches  Patent searches  Databases  Vendor and other websites  Datasheets

Where and How are Computers Used in MAE? 3 Testing and Experimental Work  Data acquisition from sensors (ME 120) Laboratory and Factory Automation and Control  Dynamic systems (ME 187, ME 190) Instrumentation and Product Design  Embedded controllers (ME 106, ME 190) MRP, Inventory, and Document Control  Drawings  Procedures  Bill of Materials (BOM)  Specifications  Engineering change orders (ECOs) er/solutions_by_product/mechatronics_process_management.shtm l /smallImages/janusLabAuto.jpg

The Bottom Line Mechanical and aerospace engineers use computers widely You need to know how to use computers to be successful ME 30 will help you especially in the area of computation and analysis  Exposure to Matlab and Excel  Focus will be on the C language I hope it will also whet your appetite to learn about mechatronics Next -->

Networking Introduce yourself to someone you DO NOT know Find out one thing about them that they like to do in their spare time Two minutes! Back

12 What and Why? Data => pieces of information we deal with in the problem solving process Why is it important to know about data types?  Need to know about data types to effectively use a programming language  It’s all just bits the lowest level! What would you rather work with… int i; float r; i = 3; r = cos(2*i*PI); or… etc.

13 Kinds of Data (simplified view)   The basic kinds of data that we will mostly use:  Numeric Integers: Real (floating point) numbers:  Character (are enclosed by single quotes in C) All letters, numbers, and special symbols  Ex. ‘A’, ‘+’, ‘5’  String (are enclosed by double quotes in C) Are combinations of more than one character  Ex. “programming”, “ME 30”  Logical (also called ‘Boolean’ named after George Boole an English mathematician from the early 1800’s) True or False (1 or 0)

Constants and Variables Constant  A data element that never changes in your program 5, 62.37, 4.219E-6, “record_string”, ‘$’ i = j + 7;/* which one is the constant? */ first_letter = ‘a’;/* which one is the constant? */ Variable  A data element that can take on different values Its name represents a location (address) in memory    i = j + 7; /* which are variables? */  second_letter = ‘b’;/* which is the variable? */ Values are ‘assigned’ using a single equal sign ( = )  Read the statement: i = j + 7;

Binary Representations Computers only contain two values  On/Off (High/Low, 0/1, etc.) Binary number only have two value 0/1  Base 2 numbering system  A bit: A number in base 2 (binary digit) How computers do what they do?  Humans are the translators  The machine just presents information Think, what is a letter?  Just a squiggle, humans give meaning

Binary Representations Everything in a PC is encoded in binary  Computers are finite, so are their representations  RGB for colors 24 bit color (8 bits for red, 8 for green, 8 for blue) TIFF  Music Midi – Instrument + note MP3 – Sound waves compressed  Cruise Control Voltage level going to an actuator

Binary to Decimal Binary number only have two value 0/1  Base 2 numbering system  A bit: A number in base 2 (binary digit) Decimal numbers have ten values 0 – 9  Base ten numbering system Think scientific notation  6.02E23 = 6 * * *  = = 1 * * * * * 2 0 Range?  Largest 8 bit value: =  Largest 16 bit value: =

Negative Values Recall:  The computer only deals in 0/1  Humans provide context Sign bit  The first bit represents sign  = -213, = 213 1’s Complement  Flip the bits (change 1’s into 0’s)  = - 213, = 213

Negative Values (Cont) 2’s Complement  Take 1’s complement, add one  Start (84 10 in this example)  Flip bits  Add one (notice the carries)

Binary to Hexadecimal Hexadecimal (base 16) is a convenient numbering system  0 – 9, A – F (A = 10 10, B = 11 10, etc Observe 2 4 = 16, allows four bits (a nyble) to be grouped = = 0xC 16

Binary to Hexadecimal Convert Binary to Hex b

Binary to Hexadecimal Convert Binary to Hex b (grouping 4 bits) d C 3 9 F h 12 * * * * 16 0 = 50,079

Representations Decimal (default)BinaryHexadecimal 1080’ x6C 108d b6Ch C dec bin6C hex Group by 3s with a comma Group by 4s with a space or an underbar Generally don’t group Spoken short form

Decimal to binary Many ways, this is how I do it 120  120 < 128, 0 in 7 th position  120 > 64, 1 in 6 th position 120 – 64 = 56  56 > 32, 1 in 5 th position 56 – 32 = 24  24 > 16, 1 in 4 th position 24 – 16 = 8  8 = 8, 1 in 3 rd position 8 – 8 = 0  Once we hit zero, all other values are zero  Why do I do it this way? It is quick when I don’t have a calculator. Your mileage may vary BinaryDecimal

References Nicholas, P. (1994). Digital Design. Minneapolis/St. Paul: West Publishing Company Kochran, S. (2014). Programming in C 4 th Edition. Upper Saddle River, NJ: Addison-Wesley