Electronics Merit Badge Class 3. 1/30/2014 Electronics Merit Badge Class 3 1

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1 Electronics Merit Badge Class 3 1/30/2014 Electronics Merit Badge Class 3 1

2 Decimal Base 10 In base 10, there are 10 unique digits (0-9). When writing large numbers (more that 1 digit), each column represents a value 10 times larger than the previous column. We say, how many 1 s, how many 10 s and how many 100 s are there? 123 1s column 10s column 100s column There is and 2 10 s and 3 1 s, Making this number equal to one hundred and twenty three. 1/30/2014 Electronics Merit Badge Class 3 2

3 Binary Base 2 In base 2 (binary) there are two numbers, 0 and 1. When writing large numbers (more that 1 digit), each column represents a value 2 times larger than the previous column. We say, how many 128s, how many 64s how many 32s, how many 16s, how many 8s, how many 4s, how many 2s and how many 1s are there? s column 2s column 4s column 8s column There is 1 8 and 1 2 and 2 1, making this number equal to eleven. 1/30/2014 Electronics Merit Badge Class 3 3

4 Counting to 16 in Binary number Binary /30/2014 Electronics Merit Badge Class 3 4

5 Hexadecimal Hexadecimal represents numbers as base 16. It is easier to write and read a large number by describing it in hex rather than in binary. Each number column is a power of 16 higher. The digits for hexadecimal are 0-9, A,B,C,D,E,F s column 16s column 256s column There are and 2 16 s and 3 1 s, making this number equal to /30/2014 Electronics Merit Badge Class 3 5

6 Counting to 16 in Binary AND Hex Decimal Binary Hex A B C D E F /30/2014 Electronics Merit Badge Class 3 6

7 The MAC address; An example of Hexadecimal Because base 16 is an even multiple of base 2, an 8 digit base 2 number can be represented in 2 characters. An ethernet adaptor s physical address is a value represented by 6 Hex numbers. 1/30/2014 Electronics Merit Badge Class 3 7

8 Binary, Decimal and Hexadecimal compared Binary Decimal Hexadecimal F E FF F Compute the missing value: 1/30/2014 Electronics Merit Badge Class 3 8

9 Binary, Decimal and Hexadecimal compared Binary Decimal Hexadecimal F E FF F Compute the missing value: 1/30/2014 Electronics Merit Badge Class 3 9

10 Binary, Decimal and Hexadecimal compared Binary Decimal Hexadecimal F E FF F Compute the missing value: 1/30/2014 Electronics Merit Badge Class 3 10

11 Binary, Decimal and Hexadecimal compared Binary Decimal Hexadecimal F E FF F /30/2014 Electronics Merit Badge Class 3 11

12 FLIP-FLOP A FLIP-FLOP is a device that changes state each time it is switched in the same direction. Press the switch, the clock goes to 0 volts (logical 0). Release the switch, the clock goes to 5 volts (logical 1). The output (Q) changes state on each 1 to 0 transition of the clock. A flip-flop basically divides the clock by 2. It takes 2 clock transitions to make the output change once. Flip-Flop Q Clock + 5V 1 0 Press 0 Press Press Press Clock Q Output 1/30/2014 Electronics Merit Badge Class 3 12

13 Binary Counter using Flip-Flops 4 Bit Binary Counter Flip Flop Flip Flop Flip Flop Flip Flop 5V Q Clk Q Clk Q Clk Q Clk press press press press press press press 6 1/30/2014 Electronics Merit Badge Class 3 13

14 Integrated Circuits An integrated circuit (IC) consists of multiple transistors. The number of transistors can vary from just a few (circuits shown below), to several hundred million that are in a Pentium microprocessor. 6 Transistors in one IC This IC has 6 inverters An inverter contains 6 Transistors = 36 total Functions Inverters Gates Flip flops Counters Memory MPU Watch ICs Calculators ICs Microwave Timer ICs Radio ICs Dialer ICs Car Controller ICs 14

15 Microprocessor Integrated Circuit: 60,000 Transistors 15

16 Basic Logic Gates X NOT Y Y = ~X X 0 1 Y 1 0 X Y AND Z = X & Y Z X Y Z

17 OR X Z Y Z = X Y X Y Basic Logic Gates NAND X Y Z Z X Y Z Z = ~(X & Y) 17

18 NOR X Y Z = ~(X Y) Z Basic Logic Gates X Y Z Z 1 Z 2 Multiple input gates Z 3 4 Z 18

19 Microprocessor Controlled Counter The kit contains a microprocessor that will drive 12 LEDs in a diminishing pattern. The LEDs can be displayed in many different modes, though each mode starts as a fast pattern, and eventually slows to a stop. 1/30/2014 Electronics Merit Badge Class 3 19

20 Microprocessor Controlled Counter 1/30/2014 Electronics Merit Badge Class 3 20

21 Microprocessor Controlled Counter Circuit Draw the Schematic / Connect the lines 1/30/2014 Electronics Merit Badge Class 3 21

22 Electronics Jobs and Education & Certification Required Electronics Technician (Computers, Cable TV, Repair, etc.) 6 months to 2 years of Electronics School during or after High School Microsoft, other Certifications Available Entry-Level Design Engineer 4-year Bachelor of Science in Electrical Engineering Degree Senior-Level Design Engineer, Engineering Manager 4-year BSEE Degree, 2-year MSEE Degree Some Engineering Positions Require State Registration (P.E.) University, R&D Laboratory Researcher Ph. D. or Sc. D. Degree in Physics or EE Joseph K. Mulcahey, P.E. Engineering Fellow office, fax cell Joseph_K_Mulcahey@raytheon.com 22

23 Graduating Engineers by Type From the American Society for Engineering Education ( 23

24 US News & World Report 2007 US Undergraduate Engineering School Rankings Rank School 1 Massachusetts Institute of Technology (MA) 2 University of California, Berkeley (CA) 2 Stanford University (CA) 4 California Institute of Technology (CA) 4 University Of Illinois, Urbana-Champaign (IL) 6 Georgia Institute of Technology (GA) 6 University of Michigan, Ann Arbor (MI) 8 Carnegie Mellon University (PA) 8 Purdue University (IN) 10 Cornell University (NY) 24

25 Annual Salary, $ Starting Salaries Jobweb.com Broad Category Offers to Graduates 50,000 45,000 40,000 35,000 30,000 25,000 20,000 15,000 10,000 5,000 0 Engineering Computer Science Business Helath Sciences Sciences Home Economics Agriculture Communications Humanities Education (2007 Min. Wage) 25

26 Annual Salary, $ Starting Salaries Jobweb.com Highest Offers by Major to Graduates 57,000 56,000 55,000 54,000 53,000 52,000 51,000 50,000 Chemical Eng. Materials Eng. EE, Comm. Eng. Computer Eng. Metallurgical Eng. Mechanical Eng. Systems Eng. Industrial Eng. Aero/Astro Eng. Mining Eng. 26