Embedded system
Embedded system
An embedded system is a computer system with a dedicated function within a larger mechanical or electrical system, often with real-time computing constraints. It is embedded as part of a complete device, often including hardware and mechanical parts. Unlike general-purpose computers, embedded systems are designed to perform specific tasks with limited resources, such as memory and processing power.
Characteristics
Embedded systems are typically characterized by:
- Reliability and real-time performance requirements.
- Low power consumption, especially in battery-operated devices.
- Small form factor, integrating processor, memory, and I/O on a single chip (microcontroller).
- Use of real-time operating systems (RTOS) or bare-metal firmware.
- Often no user interface or a minimal one (e.g., buttons, LEDs).
Applications
Embedded systems are found in nearly every electronic device today, including:
- Consumer electronics: smartphones, digital cameras, microwave ovens.
- Automotive: engine control units, antilock braking systems, infotainment systems.
- Industrial control: programmable logic controllers (PLCs), robotic controllers.
- Medical devices: pacemakers, infusion pumps, MRI scanners.
- Internet of things (IoT) devices: smart thermostats, wearable fitness trackers.
History
The first recognized embedded system was the Apollo Guidance Computer developed by the MIT Instrumentation Laboratory in the 1960s. It used a custom processor and integrated circuits to navigate the Apollo spacecraft. In the 1970s, the introduction of the Intel 4004 microprocessor enabled mass production of embedded controllers. The 1980s saw the rise of single-board computers and microcontrollers such as the Intel 8051. Today, embedded systems are ubiquitous, with billions produced annually in devices ranging from automobiles to smart home appliances.