Advanced Electricity: Embedded Systems in Wireless Communications

https://skillet.academy/courses/hands-on-electronics/lectures/56567662

Microcontrollers (MCUs)

Microcontrollers are compact integrated circuits designed to perform specific control functions in embedded systems

• CPU: central processing unit for executing instructions
• Memory: includes both RAM and ROM/Flash (permenant storage)
• I/O Ports: input/output interfaces for connecting sensors, actuators, and other peripherals
• Timers and counters: for precise control of operations.
• Applications
  • Consumer electronics: remote controls, microwave ovens, washing machines
  • automotive: engine control units, airbag systems, and infotainment
  • industrial applications, PLCs, robotic controls and sensors

Microprocessors

Microprocessors are central processing units (CPUs) used in general purpose computing systesm, capable of executing a wide range of tasks.

• CPU: powerful processing unit with multiple cores
• Cache memory: high-speed memory for rapid data access
• Control unit: manages data flow and instructions
• arithmetic logic unit (ALU): performs arithmetic and logical operations

	Microcontrollers	Microprocessors
Integration	Integrate CPU, memory and I/O ports on a single chip, disigned for specific control applications	Primarily consist of a CPU, requiring external components (memory, I/O) for full functionality, designed for general purpose computing
Applications	Used in embeedded systems for dedicated tasks (e.g. applicances, automotive systems)	Used in complex computing systems for a wide range of tasks (e.g. PCs, sensors)
Complexity and Power Consumption	Simpler, lower power consumption, and optimized for control tasks	More complex, higher consumption, and designed for computing tasks

Programming Microcontrollers and Microprocessors

Microcontrollers

• Dev environments: often programmed using integrated development environments (IDEs) like Arduino IDE, MPLAB (for PC), or Atmel Studio (for AVR)
• Languages: commonly used languages like C, C++, and assembly language
• Tools: require specific tools such as compilers, debuggers, and programmers (e.g. USB to serial converters) to upload code
• Application Focus: programs are typically optimized for specific task and real-time operations, such as sensor data processing, motor control, and user interface handling.

Microprocessors

• Dev environment: programmmed using advanced IDEs like Visual Studio, Eclipse, or command-line tools for compiling and debugging
• Languages: use higher-level languages like Python, Java, C++, and assembly for system-level programming
• Tools: require extensive toolchains including compilers, linkers, debuggers, and often rely on operating systems (e.g. linux, windows) for development
• Application focus: programs are designed for a wide range of applications from operating systems and application software to complex algorithms and user application

Embedded Systems

Embedded systems are specialized computing systems that perform dedicated functions or tasks within a larger system. They are designed to be highly efficient and reliable.

• Microcontroller/microprocessor: acts as the brain of the system, executingt the programmed tasks
• Memory: includes RAM (temporary storage) and ROM/Flash (for permenant storage of the firmware)
• Input/Output interfaces: connect to sensors, actuators, and other peripherals to interact with the external environment
• Power supply: provides the necessary power for the system's operation
• Applications
  • Automotive: engine control units, airbag systems, and infotainment systems
  • Consumer electronics: smart home devices, wearable technology, and household appliances
  • Industrial automation: robotics, programmable logic controllers (PLCs), and monitoring systems
  • Healthcare: medical devices such as heart rate monitors, MRI machines, and infusion pumps
• Characteristics
  • Real-time operation: capable of performing tasks within strict timing constraints
  • Reliability: designed for high reliability and stability, often operating continous for extended periods
  • Resource-constrained: optimized for limited resources (memory, processing power, and power consumption)

Wireless Communication

Wireless communication involves transmitting data or information without the need for physical connections, using electromagntic waves

• Transmitter: converts and sends data as electromagnetic signals
• Reciever: captures and converts signals back into data
• Medium: the space or spectrum through which signals travel, such as air or vacuum
• types
  • radio frequency (RF): use radio waves for communication
  • infrared (IR): uses infrared light for short-range communication
  • microwave: uses high-frequency waves for long-distance and high-capacity communication
• Applications
  • mobile phones, wireless internet (Wi-Fi), bluetooth devices, and sc communication

WiFi

Wi-Fi (Wireless Fidelity) is a wireless networking technology that allows devices to connect to the internet and communicate over a wireless signal

• Fequency bands: operates mainly in the 2.4 GHz and 5 GHz bands
  • 2.4 can go through walls, etc, has interference issues
  • 5 is short range and less susceptible to interference
• Standards: Governed by iEEE 802.11 standards (e.g. 802.11a/b/g/n/ax)
• Range: typical indoor range is up to 150 ft (45 meters), outdoor range up to 300 feet (90 meters)
• Benefits
  • Convenience: enables mobility and eliminates the need for cables
  • Speed: high-speed data transfer suitable for internet browsing, streaming, and gaming
  • Compatibility: widely supported by various devices like smartphones, laptops, and smart home devices

Bluetooth

Bluetooth is a wireless technology standard for exchanging data over short distances using UHF radio waves in the ISM bands, from 2.4 to 2.485 GHz

• Short range: typically up to 30 feet (10 meters), ideal for personal area networks (PANs)
• Low power consumption: designed to conserve battery life, making it suitable for portable devices
• Profiles: supports various profiles for different types of communicastion, such as audio (A2DP), file transfer (FTP), and human interface devices (HID)
• Applications
  • audio devices: wireless headphones, speakers, and hands-free headsets
  • peripheral devices: keyboards, mice, and game controllers
  • data transfer: between mobile devices, like smartphones and tablets

Radio Waves

RF refers to the use of electromagnetic waves in the frequency range of 3 KHz to 300 GHz to transmit data wirelessly

• Wide range: capable of long-distance communication, from a few meters to thousands of kilometers
• Versatility: used in various applications including broadcasting, communication, and radar systems
• Fequency bands: different applications use different frequency bands (, AM/FM radio, TV broadcasting, cellular networks)
• Examples:
  • Broadcasting: AM/FM radio, television signals
  • Communication: mobile phone networks, walkie-talkies, Wi-Fi
  • Control systems: remote controls, garage door openers, and wireless sensor networks

Internet of Things

The Internet of Things (IoT) is a network of interconnected physical devices that can collect, exchange, and act on data via the internet

• key components: include sensors/actuators, connectivity (Wi-Fi, Bluetooth, celluar), data processing, and user interfaces
• applications: found in smart homes, healthcare, industrial automation, and smart cities, enhancing automation, efficeincy, and decision making
• smart thermostats: automatically adjust heating and cooling based on user preferences and occupancy
• connected lighting: lights that can be controlled remotely or automated based on presence and schedules
• home security systems: cameras, sensors, and alarms that can be monitored and controlled via smartphone apps
• wearable health monitors: devices that track vital signs like heart rate, blood pressure, and sleep patterns, transmitting data to healthcare providers
• remote patient monitoring: sensors and devices that allow doctors to monitor patients health conditions from a distance
• smart medication dispensers: automated devices that dispense medication and remind patients to take their doses

Robotics

Robotics involves the creation and use of robots-automated machines capable of performing tasks traditionally done by humans.

• Sensors and actuators: gather information and enable movement
• control systems: process data and control robot actions
• Applications
  • Manufacturing, Healthcare, Service Industry: from industrial assembly lines to surgical robotsw and robotic vacuum cleaners
• Sense, compute, do
• Domestic robots: devices like vacuum cleaners (e.g. Roomba) that automate household chores
• Robotic waiters: used in restaurants to serve food and drinks, enhancing customer service
• Customer service robots: deployed in retail environments to assist customers with information and product selection