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2.3. Circuit Design in Embedded Systems

2.3.1. Introduction to embedded system circuit design

Circuit design is the process of designing an electronic circuit so that all the required components are connected correctly and work together to perform a specific function.

Main stages of circuit design

A professional circuit-design process normally follows several stages.

Step 1: Define the requirements

First determine what the circuit must accomplish.

Example:

Design a temperature-controlled fan that turns ON when the temperature exceeds 30°C.

Requirements might include:</strong

  • Temperature measurement
  • Microcontroller
  • Fan control
  • Display
  • Power supply
  • Protection

Step 2: Select components

Choose appropriate electronic components.

These may include:</strong

  • Microcontroller
  • Sensors
  • Resistors
  • Capacitors
  • Diodes
  • Transistors
  • MOSFETs
  • Regulators
  • Relays
  • Connectors
  • LEDs
  • Displays

Component selection depends on:</strong

  • Voltage
  • Current
  • Power
  • Accuracy
  • Speed
  • Cost
  • Availability
  • Environmental conditions

Step 3: Circuit design software selection

Before implementing an electronic circuit, you must design it by using designing software that can sometimes be tested.

Popular tools include:

  • Proteus
  • LTspice
  • KiCad
  • Multisim
  • EasyEDA

Step 4: Schematic diagram

A schematic diagram is a graphical representation of an electrical circuit.

schematic diagram shows:

  • Components
  • Connections
  • Component values
  • Pin connections
  • Power connections
  • Signal paths

MIGABO Emmanuel is an experienced Technical and Vocational Education and Training (TVET) instructor and engineering trainer with extensive experience in Electronics, Telecommunication, Computer Systems, Embedded Systems, and Information Technology. Since 2017, he has been delivering competency-based technical education and practical skills training in different educational institutions, preparing learners for careers in engineering and modern technology.

Throughout his teaching career, he has worked in various departments, including Computer Systems, Electronics and Telecommunication, Electrical Technology, and related engineering fields. He has taught learners from different academic levels using practical, project-based, and competency-based training approaches that combine theory with hands-on laboratory experience.

His teaching expertise covers a wide range of technical subjects, including:

C Programming
C++ Programming
Python Programming
Arduino IDE Programming
Embedded Systems Development
Microcontroller Programming
Electronics Fundamentals
Digital and Analog Electronics
Electrical Installation and Basic Electricity
Motherboard Design and Production
Electronic Equipment Repair and Maintenance
Enclosure Design and Production
PCB Design and Manufacturing
CCTV Camera System Installation and Configuration
Fire Detection and Alarm System Installation
Computer Hardware and Maintenance
Computer Networking Fundamentals
Sensors and Actuators
Internet of Things (IoT) Fundamentals
Technical Drawing and Engineering Documentation

In addition to classroom instruction, he has supervised numerous practical projects involving embedded systems, electronics prototyping, automation, hardware troubleshooting, and electronic product development. His training philosophy emphasizes innovation, critical thinking, problem-solving, teamwork, and industry-relevant practical skills.

He is proficient in various engineering and programming tools, including Arduino IDE, Proteus, KiCad, EasyEDA, SolidWorks, Fusion 360, and several C/C++ development environments. His interests include embedded system optimization, digital manufacturing, CAD/CAM technologies, Internet of Things (IoT), robotics, and industrial automation.

Committed to lifelong learning and professional excellence, MIGABO Emmanuel continues to develop modern training materials, competency-based curricula, and practical laboratory exercises that equip learners with the knowledge and technical skills required by today's rapidly evolving technology industry.