01
Definition
Electronics is the branch of engineering concerned with controlling electrical energy and information using circuits and electronic devices. Embedded systems combine computation with dedicated hardware to perform defined functions inside larger products.
A smartphone, robot controller, automobile ECU, drone flight controller, industrial PLC, spacecraft computer, medical instrument, and smart appliance are all examples of systems in which electronics and embedded computation are tightly coupled.
physical world → sensor → electronic signal → computation → actuator → physical world
02
The Embedded-System Stack
- Physics: electrical, mechanical, thermal, optical, and electromagnetic behavior.
- Electronics: transistors, diodes, amplifiers, converters, logic, memory, and power circuits.
- Hardware platform: PCB, MCU/MPU, memory, sensors, interfaces, power, and peripherals.
- Firmware: drivers, interrupts, device control, communication, and application logic.
- Real-time software: scheduling, concurrency, timing, and synchronization.
- Application system: algorithms, user interfaces, networking, AI, control, and product behavior.
03
Signals and Information
Electronic systems represent physical quantities as electrical signals. Signals can be continuous or discrete, analog or digitally encoded, and may carry measurements, commands, timing, or data.
x(t) → sampling → x[n] → quantization → digital representation
The transition from the physical world to digital computation requires sensing, signal conditioning, sampling, and analog-to-digital conversion.
04
Power and Energy
P = VI
Every electronic system consumes, stores, converts, or delivers electrical power. Power architecture therefore affects performance, thermal behavior, reliability, battery life, and physical design.
- Voltage regulation.
- DC-DC conversion.
- Battery management.
- Power sequencing.
- Thermal dissipation.
- Energy harvesting.
- Over-current and over-voltage protection.
05
What Makes Embedded Systems Different?
Embedded systems operate under physical constraints that general-purpose software often does not face. Memory may be limited, deadlines may be strict, power may be constrained, hardware failures may be safety-critical, and software can directly influence physical behavior.
- Deterministic timing may matter more than maximum average throughput.
- Memory and storage constraints influence architecture.
- Hardware and software are developed together.
- Interrupts and peripherals interact directly with firmware.
- Fault behavior must be considered at the system level.
- Deployment may last for years with limited opportunities for maintenance.