Notes, summaries, assignments, exams, and problems for Electronics

Introduction to Reliable Embedded Systems

Dr. Michael P. Hayes
ENCE 461: Embedded Systems II
Electrical and Computer Engineering

So you want to build an embedded system? And you want to make the hardware reliable? Oh, and you want to be able to meet EMC (Electromagnetic Compatibility) regulations so you can sell it without affecting someone’s pacemaker? Unfortunately, a consequence of improved integrated circuit technology is that they are much more complicated, switch much faster, and use many different voltage levels. So it is not just a case of choosing your microcontroller and then connecting inputs to outputs. We have to worry about the parasitic components not shown on the schematic.

We also need to understand the advanced peripherals of... Continue reading "Reliable High-Speed Digital Design for Embedded Hardware" »

Transmission Line Fundamentals

Characteristic Impedance: These are important parameters connecting the source with the transmission line ending with the load.

VSWR (Voltage Standing Wave Ratio): The ratio of maximum to minimum voltage on the line. If Z_S = Z₀ = Z_L, this leads to minimum VSWR and maximum power transfer.

Reflection Coefficient (Γ): The ratio of reflected to incident voltage wave. Γ = zero means a perfect match.

Coaxial Cable vs. Waveguide Comparison

Coaxial Cable Usage

• Lower frequencies: Typically used for frequencies < 3 GHz.
• Lower power requirements: Suitable for applications with limited power needs.

Waveguide Usage

• Higher frequencies: Used for frequencies > 3 GHz.
• Lower loss: Required when signal attenuation must be minimized.

CSA Door Supply & Install Package

I. Teckentrup Doors

Door Fabrication

A. Door Requirements

• Fire Doors: T30, T60, and T90 ratings.
• Security: RC3 or RC4 compliance.
• Acoustic Requirements: Specific leaf thickness, bottom seals, and rubber seals.
• Access Control: Electrical locks, strikes, emergency release terminals, contacts, and readers.
• Ironmongery: Door closers must be positioned on the secured side per client requirements.

B. Ironmongery & Door Parts

• Electrical Locks: Must comply with fire regulations (2.5m height). Features include read in/out functionality, escape function, fail-safe/secure modes, and internal cableways.
• Mechanical Locks: Assa Abloy 309NE/319NE mortice locks (manual locking required after opening).
• Magnetic Contacts: Interlogix

Teaching English to Young Learners (TEYL)

TEYL involves managing diverse, mixed-ability classes. Young learners are typically imaginative, curious, playful, tactile, energetic, and motivated. Their learning is often memory-based and rule-based.

Methodology and Characteristics

• Methods: Utilize movement, songs, and stories.
• Characteristics: Students may struggle to understand abstract language, have limited reading and writing skills, and possess limited world knowledge. However, they thrive on fantasy, imagination, and movement.
• Teaching Context: Usually led by a homeroom primary teacher or an L2 specialist.

How Young Learners Acquire Language

Learning should be meaning-focused, cognitively challenging, interactive, and balanced with a focus on form.... Continue reading "Best Practices in TEYL and CLIL Methodology" »

!!!!GENERAL!!!! a mod b = a - b * floor(a/b) x dBm = 10^(x/10) mW 10log(10 (mW) ) = 10 dB
!!PHY 2!! VARIABLES: P_r = Receiving power (W/mW) P_T = Sending power (W/ mW) G_T = Sending antenna gain G_R = Receiving Antenna Gain H_T = Sending antenna height (m) H_R = Receiving Antenna height (m) d = transmission distance (m) λ = c/f = wavelength (m) f = frequency (Hz) c = Speed of light = 3 * 10^8 (m/s) d_break = break point distance (m) N_T = number of transmitting antennas N_R = number of receiving antennas v = velocity (m/s)
Free space Path Loss (Friis Equation): P_R = P_T * G_T * G_R * (λ / (4πd))^2 unit antenna gain is 1. (IF isotropic antenna (theory) P_R = P_T * (c / (4πdf))^2 )
P_r / P_t = Total Path loss (db) TWO RAY: Time between

The Role of Speaking in Primary Education

• Vocabulary for basic concepts: Ensure students leave their first lesson with some English to "take away."
• Greetings and introductions.
• English names: People and countries.
• Chants, rhymes, and songs: Impression learning quickly to show off.
• Drills.
• Aim: To heighten children's awareness of language and to build up their confidence.
• Formulaic language: Language that is produced as whole chunks; routines or patterns that children memorize and which enable them to communicate with a minimum of linguistic competence. This includes:
  • Simple greetings
  • Social English
  • Routines
  • Classroom language
  • Asking for permission
  • Communication strategies

The Role of L1 in the Primary Classroom

• As a last resort: Try to make children understand

Safety Rules When Working With Electricity

Works in electrical facilities must be carried out by suitably qualified individuals and, as a rule, without electrical power. Works in locations where voltage is present can only be carried out by workers suitably qualified for such situations, who have received specific training and who use tools properly approved for working with electrical power.

Security during the carrying out of work is ensured by switching the electrical power off and by electrical lockout of the parts of the plant where the works are being carried out, and maintaining this lockout while the work is underway.

Week 1 Programs

8-Bit Addition Assembly Program

ASSUME CS:CODE, DS:DATA
DATA SEGMENT
A DB 65H
B DB 49H
C DB ?
DATA ENDS
CODE SEGMENT
START:
MOV AX,DATA
MOV DS,AX
XOR AX,AX
MOV AL,A
MOV BL,B
ADD AL,BL
MOV C,AL
INT 3H
CODE ENDS
END START

8-Bit Subtraction Assembly Program

ASSUME CS:CODE, DS:DATA
DATA SEGMENT
A DB 4AH
B DB 36H
C DB ?
DATA ENDS
CODE SEGMENT
START:
MOV AX,DATA
MOV DS,AX
XOR AX,AX
MOV AL,A
MOV BL,B
SUB AL,BL
MOV C,AL
INT 3H
CODE ENDS
END START

8-Bit Multiplication Assembly Program

ASSUME CS:CODE, DS:DATA
DATA SEGMENT
A DB 12H
B DB 14H
C DW ?
DATA ENDS
CODE SEGMENT
START:
MOV AX,DATA
MOV DS,AX
XOR AX,AX
MOV AL,A
MOV BL,B
MUL BL
MOV C,AX
INT 3H
CODE ENDS
END START

8-Bit Division Assembly Program

ASSUME CS:CODE, DS:DATA
DATA SEGMENT
A DB 25H

Sure! Here are the conversions you requested:

1. (10000101)₂ to hexadecimal (base 16):
   • Group the binary digits in sets of four from the right: 1000 0101
   • (1000)₂ = 8, (0101)₂ = 5
   • Therefore, (10000101)₂ = (85)₁₆.
2. (AA)₁₆ to decimal (base 10):
   • A = 10 in decimal, so (AA)₁₆ = 10 × 16¹ + 10 × 16⁰ = 160 + 10 = 170.
   • Therefore, (AA)₁₆ = (170)₁₀.
3. (5.5)₁₀ to binary (base 2):
   • The integer part: 5 = (101)₂.
   • The fractional part: 0.5 = (0.1)₂.
   • Combine them: (5.5)₁₀ = (101.1)₂.
4. 2's complement of (01001)₂:
   • Invert the digits: (01001)₂ → (10110)₂.
   • Add 1: (10110)₂ + (00001)₂ = (10111)₂.
   • Therefore, the 2's complement of (01001)₂ is (10111)₂.

Simplify F(A, B, C, D) with a K-Map

To simplify the Boolean expression F(A, B, C, D) = Σ m(0, 2, 3, 8, 10, 11, 12, 14) using a Karnaugh... Continue reading "Binary Conversions and K-Map Boolean Simplification" »

Classroom Management and Language Basics

Write a classroom management language sequencing sentence:

"You have ten minutes to do this."

Defining Classroom Language According to Bilash

It is the routine language that is used on a regular basis in the classroom, such as giving instructions or offering praise.

The Reading Hypothesis

This is the hypothesis that states that the more we read in a second language (L2), the greater our vocabulary will be.

Understanding the CEFR

The CEFR is a framework that describes your language proficiency.

Module 2: Teaching Methods and Evaluation

Main Characteristics of the Direct Method

Exposing students to authentic and unscripted language.

Components of Communicative Competence

Offering opportunities to integrate all language... Continue reading "Effective Language Teaching Methods and Classroom Strategies" »