Official Arduino Uno R3 SMD Microcontroller Board - A000073

Official Arduino UNO Q SBC 4GB ABX00173 The Arduino UNO Q SBC 4GB ABX00173 is a powerful and humanized dual-brain development platform designed to seamlessly bridge high-performance computing with real-time control. Featuring a Linux® Debian-capable Qualcomm® Dragonwing™ QRB2210 microprocessor alongside a real-time STM32U585 microcontroller (MCU), this 4GB variant delivers enhanced memory capacity for demanding AI-driven applications. Whether you're building systems for object recognition, voice commands, motion detection, or other intelligent edge applications, the Arduino UNO Q 4GB provides the perfect balance between a full-fledged single-board computer and precise microcontroller control. It’s not just Arduino—it’s a complete innovation platform ready to power your next advanced project. This edition of Arduino UNO Q has 4 GB of RAM and 32 GB of eMMC, making it the best choice if: You plan to use UNO Q in single-board computer (SBC) mode. Your application requires numerous high-level processes to execute at the same time. You intend to use larger, more complex AI or machine learning models (such as high-resolution computer vision or advanced audio processing). You'll need enough of built-in storage for logs and data, as well as a strong development environment. The Arduino UNO Q is the ideal tool for prototyping your next robotics or IoT project because: All-in-One Toolbox: The Arduino UNO Q is a versatile tool that combines the Dragonwing™ QRB2210 microprocessor (MPU) with a real-time STM32U585 microcontroller (MCU), making it ideal for any project. AI in a blink: Discover AI-powered vision and sound solutions that respond to their surroundings. Millions of Arduino users have created libraries, sketches, and projects for the UNO ecosystem. Compatible with the Arduino UNO ecosystem: UNO Q is compatible with a wide range of Arduino hardware, including old UNO shields and new carriers, as well as Modulino® nodes and third-party modules via the Qwiic connector. Streamlined software experience: In addition to the Arduino IDE and Arduino Cloud, you can get started with a plethora of pre-built examples and AI models available through Arduino App Lab. Seamless, unified development: create classic Arduino Sketches, code in Python® using the pre-installed Linux® Debian OS, or combine the two from a single interface - easy with Arduino App Lab. What is the Arduino App Lab? Unified Developer Experience App Lab is a brand-new comprehensive development environment that unifies the journey from Linux® to real-time OS. Preloaded on the UNO Q, App Lab combines Arduino Sketches, Python® scripts, and containerized AI models to create fully integrated applications that can be administered from a single interface. Ready-to-use Apps and Bricks Get started quickly with Arduino Apps, self-contained examples that include everything you need. Add plug-and-play capabilities to your projects using pre-built Bricks to help you push your ideas even further. Pre-loaded AI models With pre-loaded AI models in Arduino App Lab, you can use real-world data for a variety of tasks, including object/human detection, anomaly detection, image categorization, sound recognition, and keyword spotting. Find out more in the official documentation . Features: Microprocessor: Qualcomm® Dragonwing™ QRB2210 Microcontroller: Real-time, low-power STM32U585 MCU RAM: 4 GB LPDDR4 Storage: 32 GB eMMC built-in (no SD card required) Connectivity: Dual-band Wi-Fi® 5 (2.4/5 GHz), Bluetooth® 5.1 High-speed headers: Power advanced peripherals – vision, audio, display Classic UNO headers: Mount shields to add capabilities LED matrix: 8 x 13 LED matrix for visual creation and feedback USB-C connector: Power delivery, video output, or connect keyboard, mouse, USB microphones or USB cameras via dongle Qwiic connector: Expand easily with Modulino® nodes – no soldering required

7Semi BME688 Environmental Sensor Nano Breakout with 2.54mm Pitch Header The 7Semi BME688 Environmental Sensor Nano Breakout with 2.54mm Pitch Header is a versatile and high-precision environmental sensor designed for modern monitoring applications. Built around Bosch’s advanced BME688, it accurately tracks temperature, humidity, air pressure, and gas levels, helping you gain meaningful insights into environmental conditions. Its compact nano form factor and I2C interface make integration simple with Arduino, Raspberry Pi, and other development boards. Whether you’re building a smart home system, an industrial monitoring setup, or an environmental research project, this environmental monitoring sensor delivers dependable performance in a user-friendly design. Features: AI-Enhanced Gas Sensing: Identifies dangerous gasses with exceptional accuracy. Comprehensive Monitoring: A single sensor measures numerous essential environmental factors. Flexible Interface: I2C connectivity enables seamless interaction with microcontrollers. Compact design: The nano breakout board is ideal for projects with limited space. 3.3V Operating Voltage: Suitable for a wide range of development boards. Gas sensor sensitivity, selectivity, and data rate can all be adjusted to meet your individual application requirements.

7Semi Compact FT232 USB-C UART (TTL) Communication Module The 7Semi Compact FT232 USB-C UART (TTL) Communication Module is a reliable and easy-to-use USB UART Module designed for stable USB-to-TTL serial communication. Powered by the FT232RNL chip, it ensures accurate data transfer between USB ports and microcontrollers, development boards, or embedded systems. With support for both 5V and 3.3V logic levels, this USB UART Module adapts easily to different hardware requirements. Its USB Type-C interface enhances durability and connectivity, while the onboard TX and RX LEDs provide clear visual feedback during data transmission, making it ideal for debugging, programming, and serial communication applications. Features: Time-saving: With quick setup and straightforward use, you can focus on your job rather than connectivity issues. Wide Application: It is compatible with a wide range of TTL devices, making it suitable for a variety of projects. Project tracking allows you to easily monitor data flow and ensure that everything goes properly. Adaptable: The flexible power and logic levels accommodate a wide range of development situations. FT232 devices provide two driver options: VCP (Virtual COM Port): Ideal for simple projects in which you want your device to behave like a conventional serial device. D2XX: Provides greater control and flexibility, but requires programming using API functions. Select this if you require advanced functionality.

7Semi DC Buck Converter Breakout 5V 2A Out (AP62301) (BO-10133) The 7Semi DC Buck Converter Breakout 5V 2A Out (AP62301) is a small power module that converts higher DC input voltages into a steady 5V output with up to 2A current. It allows you to power 5V-based electronics from a wide range of DC power sources such as batteries and adapters. This makes it perfect for projects that need a reliable 5V supply. Built with an efficient synchronous buck converter design, this module delivers stable power while keeping energy loss and heat to a minimum. Its compact size makes it easy to add to space-limited electronics projects like IoT devices, microcontroller boards, and portable systems. Whether you’re building sensors, development boards, or embedded systems, this buck converter gives you a simple and dependable way to get 5V power. Features: Provides a stable 5V output with up to 2A continuous current Accepts a wide range of DC input voltages for flexible power sources Efficient synchronous buck converter design for low power loss Low heat generation for cool and reliable operation Compact breakout board for easy integration and prototyping Ideal for powering 5V microcontrollers, sensors, and IoT devices Perfect for embedded systems, portable electronics, and hobby projects

Cytron 8-Channel RC Servo Controller Shield – 5V 5A Regulated Power for Arduino The Cytron 8-Channel RC Servo Controller Shield is designed for makers, robotics enthusiasts, and educators who need reliable, high-power servo control for Arduino projects. With its built-in 5V 5A switching regulator, this servo shield eliminates the usual power limitations that come with driving multiple RC servos. It seamlessly works with popular Arduino boards like Arduino UNO, Mega, CT-UNO, and more - making it an ideal solution for robotics, animatronics, humanoid robots, and automation systems. Keywords naturally included: Arduino servo shield, RC servo controller, 8-channel servo driver, robotics servo control. This shield allows you to control eight independent RC servos simultaneously, offering precise position and speed control using a simple UART interface. Each channel supports a wide 0.5ms–2.5ms pulse range, enabling full 180° servo rotation control for most RC servos. Whether you're building robotic arms, walking robots, pan-tilt systems, or classroom STEM models, this Cytron servo controller shield ensures smooth servo movements, stable power delivery, and user-friendly integration with Arduino. Features: Supports 8 independent RC servo channels, allowing simultaneous multi-servo control for robotics and automation projects. Built-in 5V/5A peak (4A continuous) switching regulator, enabling safe and stable servo operation without an external power module. Wide input voltage range from 7V to 25V, making it compatible with most robot power systems. Offers UART control (UC00A/UC00C and others supported), enabling activation, speed control, positioning, and optional position reporting. Generates precise servo pulses from 0.5ms to 2.5ms with a resolution of 0.25 µs for smooth and accurate motion. Fully compatible with Arduino logic level (5V) and supports Arduino UNO, Mega, CT-UNO, CT-ARM, etc. Stores UART baud rate in non-volatile memory (default 9600). Includes independent startup position command for each channel.

Cytron SHIELD-MD10 – 10A 7V–30V DC Motor Driver Shield for Arduino The Cytron SHIELD-MD10 is a high-performance 10A DC motor driver shield designed for Arduino and compatible development boards. Built specifically for brushed DC motors, it supports 7V–30V motor voltage and delivers up to 10A continuous current, making it ideal for robotics, automation, RC systems, DIY machines, and educational electronics. With solid-state MOSFETs and a fully NMOS H-Bridge design, the Cytron SHIELD-MD10 ensures efficient, fast, and reliable motor control without the need for a heatsink, helping creators achieve accurate speed and direction control with minimal wiring. Optimized for maximum compatibility, the shield stacks directly onto popular boards like Arduino UNO R3, Arduino Mega 2560, Maker UNO, Maker UNO Plus, Arduino Leonardo, CT-UNO, and CT-ARM. Featuring selectable digital pins for PWM and DIR, stackable headers, and regenerative braking, the Cytron SHIELD-MD10 offers unmatched flexibility for robotics and mechatronics projects. Whether you're building a DIY robot, conveyor system, or motorized prototype, this durable and high-current driver shield delivers smooth performance and long-lasting reliability. Features: Bi-directional control for one brushed DC motor with smooth speed and direction adjustment. Supports motor voltage from 7V–25V (Rev 1.0) and 7V–30V (Rev 2.0). Delivers 10A continuous and 15A peak current for high-torque applications. Uses fully solid-state components with NMOS H-Bridge for high efficiency. No heatsink required thanks to low-loss MOSFET design. Supports both 3.3V and 5V logic inputs, making it compatible with multiple controllers. Regenerative braking for safe and controlled stopping. Stackable pin headers allow adding more Arduino shields. Selectable digital pins for PWM and direction via jumpers. PWM frequency supported up to 10 kHz for fine speed control.

7Semi BMP581 High-Precision Barometric Pressure & Altitude Sensor Breakout The 7Semi BMP581 Barometric Pressure & Altitude Sensor Breakout is engineered for projects that demand highly accurate atmospheric pressure and altitude data. Built on Bosch’s advanced sensing technology, this compact module delivers exceptional precision with ±30 Pa absolute accuracy and ±6 Pa relative accuracy, translating to altitude precision as fine as ±0.5 meters. Its ability to operate across a wide 300–1250 hPa pressure range makes it ideal for applications like weather stations, environmental monitoring, and UAV altitude tracking. Designed for effortless integration, the BMP581 supports I2C, I3C, and SPI interfaces, making it compatible with a wide range of development boards and embedded systems. The Qwiic connector ensures solder-free wiring, while the low-power operation makes it suitable for portable and battery-powered devices. Whether you're building an IoT sensor node, a smart altimeter, or barometric logging system, this breakout brings reliable performance, high sensitivity, and fast data rates, perfect for altitude measurement and barometric pressure sensing projects. Features: Provides high-precision barometric readings with ±30 Pa absolute accuracy and ±6 Pa relative accuracy for reliable altitude measurement. Offers extremely fine resolution down to 1/64 Pa, ensuring smooth and accurate environmental data output. Includes Qwiic Connect support for solder-free I2C connectivity along with 0.1" header pins for SPI or wired I2C connections. Operates with ultra-low power consumption, only 1.5 µA in deep standby and 260 µA during active measurements. Covers a wide pressure sensing range from 30 to 125 kPa with high output data rates up to 622 Hz for real-time applications. Provides flexible configuration options, including adjustable oversampling, FIFO buffer, and low-pass filtering for optimized performance. Features 6 bytes of onboard non-volatile memory for storing user-specific calibration or configuration data.

7Semi DC-DC Buck Converter 5V 3A Out - MP2338 (BO-10182) The 7Semi DC-DC Buck Converter 5V 3A Out – MP2338 (BO-10182) is a compact power module designed to step down higher DC voltages to a stable 5V output with up to 3A current. It provides reliable and efficient power for electronics that require a steady 5V supply, such as microcontrollers, sensors, and development boards. Built around the MP2338 step-down converter, this module offers high efficiency and stable performance while minimizing heat and power loss. It supports a wide input voltage range and includes built-in protection features for safe operation. Whether you’re working on embedded systems, IoT devices, or custom electronics projects, this buck converter makes power management simple and dependable. Features: Boosts power efficiency with a high-performance MP2338 buck converter Provides a stable 5V output at up to 3A for reliable powering Wide input voltage range, compatible with various DC sources Compact breakout module for easy PCB or project integration Built-in protection features for safe and stable operation Ideal for microcontrollers, sensors, IoT boards, and embedded systems

Cytron SHIELD-3AMOTOR 1.2A Dual Channel 7V–30V DC Motor Driver Shield for Arduino The Cytron SHIELD-3AMOTOR is a high-performance, dual-channel DC motor driver shield designed for Arduino users who need reliable and efficient motor control. Supporting motor voltages from 7V to 30V and delivering up to 3A peak and 1.2A continuous current per channel, this shield is ideal for robotics, automation, DIY RC vehicles, and mechatronics projects. Its compatibility with Arduino UNO, Mega, Leonardo, Zero, 101, and other popular boards makes it a plug-and-play solution for both beginners and advanced makers searching for powerful motor-driving capabilities. Built using the DRV8871 motor driver IC, the Cytron SHIELD-3AMOTOR supports both Signed Magnitude and Locked Anti-Phase control modes via an easy DIP switch selector. Additional features such as current limit protection, stackable headers, quick-test pushbuttons, and direct connectors for the LSS05 auto-calibrating line sensor make this shield perfect for building reliable robot platforms, line-followers, and dual-motor systems. With strong motor handling and seamless Arduino integration, this Cytron shield makes high-current motor control simple, safe, and efficient. Features: Dual-channel brushed DC motor driver shield designed for full Arduino compatibility. Supports 7V–30V motor voltage, suitable for a wide range of DC motors. Handles 3A peak and 1.2A continuous current per channel, ideal for medium-power robotic applications. Built-in current limit protection for safer motor operation. Compatible with 3.3V and 5V logic input, supporting various Arduino boards. DRV8871 IC ensures smooth, efficient, and reliable motor control. Selectable control modes: Signed Magnitude and Locked Anti-Phase via DIP switches. Stackable header pins for easy integration with additional shields. Quick-test switches provided for rapid motor testing on both channels. Includes dedicated connector for Cytron LSS05 Line Sensor, ideal for line-following robots. (Note: No polarity protection for motor supply input - connect with care.)

7Semi 5A Analog INA169 DC Current Sensor Breakout The 7Semi 5A Analog INA169 DC Current Sensor Breakout is a precision Analog DC current sensor designed for accurate current monitoring in electronic circuits. Powered by the trusted INA169 chip, it delivers consistent current readings up to 5A across a wide input range of 2.7V to 60V. Its low offset voltage and minimal quiescent current ensure reliable measurements, while adjustable gain and overcurrent protection add versatility for various applications. Compact and easy to integrate with microcontroller-based systems, this INA169 current sensor is perfect for IoT projects, battery management, power monitoring, and smart energy solutions, providing dependable performance for both hobbyists and professional engineers. Features: Wide Voltage Range Compatibility: Operates efficiently between 2.7V and 60V, making it suitable for both low and high-voltage applications. High-Side Current measuring: Enables unipolar high-side current measuring for safer and more accurate readings. Customizable Gain Control: Easily alter output sensitivity with a single resistor to meet your individual application requirements. Built-in Signal Amplifier: Provides clean and amplified output signals for accurate ADC conversion. Overcurrent detection protects connected components by detecting and responding to excessive current. Low Quiescent Current: Consumes only 60 µA, making it ideal for energy-sensitive projects. Microcontroller-Friendly: Fully compatible with Arduino, ESP32, STM32, Raspberry Pi, and other development boards. Compact Design: Small form factor excellent for embedded system integration and space constraints. Connection Diagram with Arduino:

Cytron ESP8266 WiFi Shield for Arduino with WROOM-02 Module The Cytron ESP8266 WiFi Shield is a beginner-friendly, plug-and-play solution that makes adding WiFi connectivity to Arduino projects incredibly easy. Powered by the reliable ESP8266 WROOM-02 module, this shield eliminates the wiring complications and level-shifting issues commonly faced when using standalone ESP modules. With preloaded Cytron_ESP_AT Firmware V2.2.0, onboard 3.3V regulation, selectable UART pins, and support for AT-command control, it is the perfect choice for IoT applications, wireless sensor systems, home automation, and connected electronics. Designed with the Arduino R3 layout, this WiFi shield works seamlessly with Arduino UNO, Maker UNO, CT-UNO, CT-ARM, and various compatible boards. It also offers direct programming access to the ESP8266, breakout I/O pins, and optional microSD card support for data logging. Whether you're uploading custom firmware or using AT commands for WiFi communication, the Cytron ESP8266 WiFi Shield delivers stable wireless performance, strong signal output, and unmatched ease of integration, making it ideal for both beginners and advanced IoT developers. Features: Compatible with Arduino R3 layout boards including Maker UNO, CT-UNO, CT-ARM, Arduino UNO R3, and Arduino Leonardo. Preassembled with ESP8266 WROOM-02 module and flashed with Cytron_ESP_AT V2.2.0 firmware. Onboard 3.3V regulator capable of supplying up to 500mA for stable WiFi operation. Selectable UART/Serial communication via mini jumpers (USB, hardware serial, software serial options). Supports 802.11 b/g/n, Wi-Fi Direct (P2P), Soft-AP mode, and full TCP/IP protocol stack. Integrated TR switch, balun, power amplifier, LNA, PLLs, regulators, and 32-bit CPU. +19.5 dBm output power for strong wireless range. Breakout pins available for programming or full I/O access of WROOM-02. Includes optional microSD slot for data logging and local storage. Each shield is fully assembled and tested before shipping.

Cytron UNO Special Edition – Arduino-Compatible Board with Side Connectors The Cytron UNO Special Edition (CT-UNO-SE) is a fully Arduino-compatible development board designed for makers, students, and hobbyists who need reliable performance for DIY electronics and robotics projects. Built around the ATmega328P microcontroller, this board offers the familiar Arduino UNO experience while adding enhanced stability with the FTDI FT231X USB-to-Serial chip, ensuring smoother programming and communication. Whether you're prototyping sensors, robotics circuits, or automation systems, this board delivers a dependable and beginner-friendly platform for all your microcontroller learning needs. What makes the CT-UNO-SE stand out is its unique side connectors, allowing it to be stacked on top of or beneath Arduino shields, giving you maximum flexibility while building layered circuits or compact embedded systems. With full Arduino UNO R3 shield compatibility, 14 digital I/O pins, 6 analog inputs, and both 5V and 3.3V regulated outputs, this special edition board combines convenience, versatility, and long-term durability - all wrapped into a sleek white PCB that makes your projects look clean and professional. Features Built with the ATmega328P microcontroller paired with the Optiboot bootloader for faster program uploads. Equipped with the FTDI FT231X USB interface, offering stable and reliable serial communication. Supports a wide DC input range of 7–15V, suitable for most maker power setups. Includes a 1A 5V regulator and 500mA 3.3V regulator for powering sensors and modules. Offers 14 digital I/O pins (6 PWM) and 6 analog inputs for versatile interfacing. Fully R3 shield compatible with special side connectors for flexible stacking. Features 32KB Flash memory, 2KB SRAM, and 1KB EEPROM for program storage. Comes with easily visible TX, RX, power, and pin-13 LEDs placed on the board edge. Utilizes a durable USB Micro-B connector on a clean white PCB. Dimensions

Cytron UNO – Arduino UNO Compatible Board with USB Micro-B The Cytron UNO is a fully Arduino UNO compatible development board built with the reliable ATmega328P microcontroller, making it ideal for beginners, students, hobbyists, and electronics enthusiasts. Designed to offer the same functionality as the Arduino UNO R3, the Cytron UNO includes 14 digital I/O pins, 6 PWM outputs, 6 analog inputs, UART, SPI, I2C, and full R3 shield compatibility. With USB Micro-B connectivity, you can easily program the board using the same cable used for Android phones and power banks - making it more convenient and cost-friendly for modern makers. Cytron further enhances the board with a stronger onboard voltage regulator, improved power handling, and repositioned LEDs on the edge for better visibility, even when a shield is attached. The CT-UNO also includes extra standard pads for custom shields, an FTDI-based USB interface for stable programming, and robust DC input support from 7V to 15V. Whether you’re building IoT prototypes, robotics, embedded systems, or learning coding fundamentals, the Cytron UNO delivers reliability, ease of use, and full compatibility with the entire Arduino ecosystem. Features Powered by SMD ATmega328P with Optiboot (UNO R3) bootloader for fast programming. USB programming enabled by stable FTDI FT231X chip for improved reliability. Supports DC 7–15V input with upgraded onboard voltage regulator for higher output current. Offers 14 digital I/O pins, including 6 PWM outputs, and 6 analog inputs for versatile projects. Fully Arduino UNO R3 shield compatible with ISP header and broken-out SDA, SCL, IOREF pins. Uses USB Micro-B socket, compatible with standard Android phone cables. LEDs relocated to board edge for clear visibility during development. Includes additional 2.54mm pads for creating custom shields. White PCB design with clean layout and Cytron build quality. Dimensions

7Semi BME680 Temperature, Humidity, Pressure & Air Quality Sensor Breakout with Qwiic Interface The 7Semi BME680 Environmental Sensor Breakout is a compact yet powerful module designed for applications that require accurate measurement of temperature, humidity, pressure, and indoor air quality. Built around the trusted Bosch BME680 sensor, it provides dependable multi-parameter environmental data in real time, making it ideal for IoT projects, smart home automation systems, and portable environmental monitoring devices. Its efficient gas sensor intelligently detects VOC levels, helping you assess indoor air quality with ease. Engineered for universal compatibility, this breakout includes both a voltage regulator and level shifter, enabling seamless integration with 3.3V and 5V microcontroller platforms such as Arduino and Raspberry Pi. The Qwiic connector and I2C/SPI support ensure quick setup without messy wiring, while its compact size makes it perfect for wearables and space-constrained builds. With low-power operation, stable readings, and selectable I2C addresses, this module provides developers with a simple and reliable way to enhance environmental sensing in modern embedded projects. Features: Provides accurate measurement of temperature, humidity, pressure, and VOC-based air quality, making it an all-in-one environmental sensor solution. Supports I2C and SPI communication, ensuring smooth integration with Raspberry Pi, Arduino, ESP32, and other development boards. Includes selectable I2C addresses (0x76/0x77) to allow multiple sensors on a single bus without conflicts. Features a built-in voltage regulator and level shifting circuitry, allowing safe use with both 3.3V and 5V systems. Designed with low power consumption, suitable for long-term, battery-powered, or portable applications. Comes in a compact 19×19 mm breakout form factor, perfect for handheld devices, IoT wearables, and mini weather stations. Provides stable VOC readings after a short burn-in time, ensuring reliable indoor air quality measurements.

SmartElex CP2102 Type C, USB To UART (TTL) Communication Module The SmartElex CP2102 module is a compact and reliable communication module designed to convert USB-C signals into UART (TTL) serial communication. It helps users easily connect microcontrollers and development boards to a computer for programming, debugging, and serial monitoring, removing the need for complex interfaces. This module is well suited for students, makers, educators, engineers, and startups who need a dependable USB to serial solution for everyday electronics work. This USB to UART TTL converter module works smoothly with popular platforms such as Arduino, Raspberry Pi, and ESP32, making it useful for robotics, IoT development, automation systems, and rapid prototyping. Its plug-and-play USB-C design allows quick setup and stable data communication, saving time during development and testing. Whether used for firmware upload, device configuration, or serial communication, this module offers reliable performance and easy integration for practical embedded projects. Applications: Programming and debugging microcontrollers Serial communication with embedded systems USB to TTL conversion for compatible devices Data logging, testing, and monitoring tasks Cautions: Ensure the correct voltage is selected using the onboard jumper to avoid damage Designed only for TTL-level signals; do not connect directly to RS232 interfaces Avoid exposure to moisture and protect the module from static discharge Features: USB-C to UART (TTL) communication module for serial interfacing Based on CP2102 chipset for stable and reliable data transfer Plug-and-play design for quick setup with a computer Compatible with Arduino, Raspberry Pi, ESP32, and similar boards Ideal for programming, debugging, and serial monitoring tasks Suitable for robotics, IoT, automation, and DIY electronics projects