Gravity: Offline Voice Recognition Sensor for micro:bit, Arduino, ESP32 - I2C & UART

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

7Semi SHT41 Temperature & Humidity Sensor Tiny Breakout with I2C Qwiic The 7Semi SHT41 Temperature & Humidity Sensor Tiny Breakout is crafted for engineers, IoT developers, and embedded system designers who need precise environmental monitoring in extremely compact spaces. Powered by the fourth-generation SHT41 sensor, it delivers exceptional accuracy with ±1.8% RH and ±0.2°C precision, making it ideal for sensitive applications like HVAC regulation, smart home devices, and industrial IoT nodes. Its stable readings and fast response time ensure reliable environmental sensing even in dynamic conditions. Designed for low-power performance, this breakout operates on a 3.3V supply and consumes less than 0.15 mA in low-power mode, making it a perfect match for wireless systems and battery-powered deployments. With built-in I2C support, multiple address options, and a compact 1.27 mm pitch connector, integration is quick and hassle-free. Whether you're building connected sensors, indoor air-quality systems, or compact IoT hardware, this module provides dependable data for real-time decision-making and energy-efficient operations. Features: Designed with the advanced SHT41 sensor, offering high-precision measurements with ±1.8% RH humidity accuracy and ±0.2°C temperature accuracy. Operates with ultra-low power consumption, drawing less than 0.15mA in low-power mode to extend battery life in portable systems. Supports I2C communication with multiple configurable addresses for flexible integration in multi-sensor setups. Compact and lightweight form factor with a 1.27 mm pitch 4-pin connector, making it suitable for tight-space and embedded applications. Built for industrial-grade reliability, ensuring consistent performance across typical indoor and light industrial environments. Simple plug-and-play workflow enables quick installation for IoT platforms, smart buildings, automation systems, and environmental monitoring.

SmartElex Hall Sensor The SmartElex Hall Sensor is a compact electronic component designed to detect magnetic fields using the Hall effect. It helps sense the presence, strength, or change in magnetic fields without physical contact, making it useful for reliable and wear-free detection. This sensor is suitable for students, makers, engineers, educators, and startups who are working on electronics projects that require accurate magnetic field sensing, position detection, or rotational speed measurement. This hall effect sensor is widely used in robotics, IoT devices, automation systems, and general prototyping applications. It can be easily interfaced with popular development platforms such as Arduino, Raspberry Pi, and ESP32, allowing quick integration into both learning projects and real-world systems. Common use cases include motor speed sensing, position detection, proximity sensing, and safety switches, where consistent performance and simple integration are important. Features: Detects magnetic fields using the Hall effect principle Contactless sensing for reliable and wear-free operation Fast response suitable for speed and position detection Digital/analog output (depending on variant) for easy interfacing Compatible with Arduino, Raspberry Pi, ESP32, and other controllers Ideal for motor control, proximity sensing, and automation projects

7Semi BMA400 3-Axis Digital Accelerometer Breakout Board STEMMA QT / Qwiic The 7Semi BMA400 3-Axis Digital Accelerometer Breakout Board STEMMA QT / Qwiic features the highly precise BMA400 3-axis accelerometer, delivering accurate 3D acceleration measurements with 12-bit digital resolution and 0.001g sensitivity. Supporting selectable measurement ranges of ±2g, ±4g, ±8g, and ±16g, this ultra-low power sensor can detect tilt, orientation, tap/double-tap, and perform step counting with activity recognition—making it perfect for wearable devices and battery-sensitive applications. Its Qwiic/STEMMA QT connector allows effortless plug-and-play integration, while dual power support (3.3V/5V) and flexible I2C/SPI interfaces ensure compatibility with a wide range of microcontrollers. With two configurable interrupt pins and a compact design, this breakout board is ideal for robotics, motion sensing, vibration monitoring, and other STEM projects requiring precise and reliable acceleration data. Features: 3.3 and 5 volt power supply I2C and SPI communication, with 2 interrupt pins. Digital resolution: 12 bits. Measurement range: +- 2g, 4g, 8g, 16g. BMA400 3-Axis Digital Accelerometer Breakout Pinouts:

7Semi DC Buck Converter Breakout 3.3V 2A Out (AP62301) (BO-10131) The 7Semi DC Buck Converter Breakout 3.3V 2A Out (AP62301) is a compact power module that converts higher DC voltages into a stable 3.3V output with up to 2A current. It accepts a wide range of input voltages, making it useful for powering low-voltage electronics from batteries, adapters, and other DC sources. This makes it ideal for projects that require a reliable 3.3V supply. Built using an efficient synchronous buck converter design, this board delivers dependable power with minimal energy loss and low heat output. The small form factor allows easy integration into your electronics builds, especially space-constrained and portable systems. Whether you’re working on IoT devices, embedded controllers, or sensor systems, this converter provides a simple and efficient power solution for your 3.3V needs. Features: Provides a stable 3.3V output with up to 2A continuous current Accepts a wide DC input voltage range for flexible power sources High-efficiency synchronous buck converter design Low heat generation for efficient and safe power delivery Compact breakout board for easy integration and prototyping Ideal for IoT devices, embedded systems, and battery-powered projects Suitable for powering microcontrollers, sensors, and communication modules

Cytron Maker Object – Digital IR Proximity Sensor The Cytron Maker Object is a compact digital IR proximity sensor designed for beginners, hobbyists, and robot builders who need reliable object detection or obstacle sensing in their projects. Engineered with a 38kHz modulated IR signal, the Cytron sensor remains immune to ambient light, ensuring stable readings in both indoor and outdoor environments. Its active-low NPN output, internal pull-up resistor, and easy plug-and-play interface make it ideal for robotics, automation, and DIY electronics projects where simplicity and accuracy matter. Despite its tiny form factor, the Cytron Maker Object IR sensor offers impressive sensing capability with an adjustable detection range: 15–60 cm for dark surfaces and 40–140 cm for light surfaces. The 90-degree header design allows effortless mounting on PCBs, breadboards, or compact robots such as mini sumo bots. Whether you’re building an obstacle-avoidance robot, an automatic gate safety sensor, a parking occupancy counter, or an entrance detection system, the Cytron Maker Object delivers dependable performance in a small, beginner-friendly package. Features: Cytron’s compact digital IR proximity sensor designed for easy object and obstacle detection. 38kHz modulated IR signal provides strong immunity to ambient light interference. Active-low NPN output with internal pull-up resistor for direct microcontroller compatibility. Adjustable sensing range optimized for different surface colors: 15–60cm (black), 40–140cm (white). Breadboard-friendly design with a 90-degree pin header for effortless mounting on robots or PCBs. Ideal for mini robots, sumo bots, automation setups, safety systems, and DIY electronics.

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.)

Cytron Maker UNO X – Arduino Compatible Development Board for Classroom The Cytron Maker UNO X is a beginner-friendly, classroom-ready Arduino-compatible development board designed to simplify STEM education. Equipped with built-in LEDs on every digital pin, a programmable push button, a piezo buzzer, and a powerbank-friendly design, it eliminates messy wiring and allows students to start coding instantly. This board is ideal for Arduino beginners, school STEM labs, coding clubs, training centers, and anyone learning microcontroller basics. With plug-and-play functionality and seamless compatibility with Arduino IDE, it delivers a smooth learning experience for educators and students alike. Created with the needs of teachers in mind, the Cytron Maker UNO X features an onboard half-size breadboard and perfboard for quick prototyping, making it easy to build hands-on electronics projects right out of the box. Powered by the ATmega328P, and complete with essential interfaces like UART, SPI, I2C, PWM pins, and analog inputs, this board is perfect for exploring coding, electronics, and robotics in a structured classroom setup. Whether for STEM workshops, school projects, or Arduino training programs, Maker UNO X provides an engaging, frustration-free learning experience. Features: Fully Arduino UNO-compatible board designed specially for classrooms and STEM beginners. Built-in LED indicators on every digital pin, allowing students to visualize code output instantly without wiring. Includes piezo buzzer, programmable push button, and powerbank-friendly operation for portable projects. Comes with an onboard perfboard prototyping area and a half-size breadboard to simplify hands-on experiments. Powered by the reliable ATmega328P microcontroller with 16MHz clock speed and full support in Arduino IDE. Offers 20 digital I/O pins, 6 PWM pins, 6 analog inputs, and communication interfaces (UART, SPI, I2C). Features 32KB Flash, 2KB SRAM, 1KB EEPROM, making it ideal for beginner programming and small-scale electronics projects. Uses a USB Micro-B interface with CH9340 USB-UART chip (note: not supported on Windows 7). Designed by Cytron to support educators - ensures faster learning with fewer wiring issues and more hands-on coding.

7Semi ENS160 Air Quality Sensor I2C Probe (ES-12183) The 7Semi ENS160 Air Quality Sensor I2C Probe (ES-12183) is a compact and ready-to-use air quality sensing module built to measure indoor environmental conditions. It uses the advanced ENS160 multi-gas sensor to detect volatile organic compounds (VOCs) and other indoor pollutants, helping you understand the quality of the air around you. The probe provides clean, processed digital outputs that make monitoring easy. This sensor communicates over a standard I2C interface and works at 3.3 V, making it simple to connect to popular controllers like Arduino, ESP32, or Raspberry Pi. With features like long-term stability, low power use, and reliable performance across a range of temperatures and humidity levels, it’s a great choice for smart home systems, air purifiers, HVAC monitoring, and other environmental projects. Features: Advanced ENS160 multi-gas sensor for indoor air quality monitoring Detects VOCs and air quality levels for healthier environments I2C digital interface for simple integration with microcontrollers Factory-calibrated sensor for reliable and consistent readings Low power consumption, suitable for continuous monitoring Compatible with Arduino, ESP32, Raspberry Pi, and IoT systems 7Semi I2C Wire Color Code

SmartElex BX404 Digital PIR Motion Sensor The SmartElex BX404 PIR Motion Sensor is a compact and reliable BX404 PIR Motion Sensor designed to detect human movement using passive infrared technology. It helps users sense motion accurately by detecting changes in body heat, making it useful for security, automation, and energy-saving applications. This passive infrared sensor is ideal for students, makers, educators, engineers, and startups looking to add motion detection to their electronic projects in a simple and effective way. The sensor works smoothly with popular platforms such as Arduino, Raspberry Pi, and ESP32, allowing easy integration into robotics, IoT devices, and automation systems. Its stable digital output makes it suitable for applications like smart lighting, intrusion alarms, occupancy detection, and DIY prototypes. With easy interfacing and dependable performance, this sensor enables quick development of motion-based solutions for real-world electronics projects. Features: Accurate motion detection using passive infrared sensing Designed for reliable human movement detection Digital output for easy interfacing with controllers Compatible with Arduino, Raspberry Pi, and ESP32 Low power operation for continuous monitoring Ideal for security, automation, and smart electronics projects

SmartElex MPL3115A2 Altitude Pressure Sensor Breakout Board The SmartElex MPL3115A2 Altitude Pressure Sensor Breakout Board is a compact and reliable altitude sensor module designed for precise environmental measurements. Based on the MPL3115A2 MEMS sensor, it delivers altitude data with accuracy up to 30 cm and pressure readings in fractions of a Pascal using a high-resolution 24-bit ADC. The sensor communicates via I2C, making it simple to interface with popular microcontrollers and development boards. This Breakout Board includes all required passive components and exposes the pins on a 0.1″ header, allowing quick prototyping without extra circuitry. With added 12-bit temperature sensing, this Altitude Pressure Sensor is well-suited for drones, weather monitoring, navigation systems, and embedded IoT applications. Features: Supply voltage ranges from 1.95V to 3.6V and is internally regulated by the LDO. Digital interface supply voltage ranges from 1.6 to 3.6 V. Internally, fully compensated. Direct reading, compensated. Pressure: 20-bit measurement (in Pascals) Altitude: 20-bit measurement (metres) Temperature: 12-bit measurement (in degrees Celsius) Programmable events. Autonomous Data Acquisition Resolution down to 1 ft. (30 cm) 32 Sample FIFO Ability to log data for up to 12 days using the FIFO method Data acquisition rates range from one second to nine hours. I2C digital output interface operates at up to 400 kHz.

SmartElex STTS22H Temperature Sensor Module The SmartElex STTS22H Temperature Sensor Module is a compact and reliable temperature sensor module designed for accurate digital temperature measurement. It helps users monitor temperature precisely in electronic systems without complex circuit design, making it ideal for students, makers, educators, and engineers working on sensing and monitoring projects. With its breakout board design, this digital temperature sensor is easy to handle and well suited for learning, testing, and early-stage product development. This sensor module is commonly used in IoT devices, robotics systems, automation setups, and data logging applications where consistent temperature monitoring is required. It integrates easily with popular platforms such as Arduino, Raspberry Pi, and ESP32, allowing quick connection and smooth communication for prototyping and experimentation. With dependable performance and simple integration, the SmartElex STTS22H breakout board is a practical choice for educational labs, DIY projects, and embedded development applications. Features: Digital temperature sensor module with stable and accurate readings Breakout board design for easy handling and quick prototyping Simple digital interface for smooth data communication Compatible with Arduino, Raspberry Pi, and ESP32 platforms Ideal for IoT, robotics, and automation projects Suitable for education, DIY electronics, and embedded development

7Semi High-Precision Temperature & Humidity Sensor Probe The 7Semi High-Precision One-Wire Temperature and Humidity Probe is engineered for applications where accuracy, durability, and reliability truly matter. Built with advanced CMOSens sensing technology, it delivers precise digital measurements even in extreme environmental conditions. Its stainless-steel porous housing provides excellent protection against moisture, dust, and chemical contaminants, making it dependable for long-term use in demanding setups. Designed for industrial automation, scientific research, HVAC systems, and environmental monitoring, this probe offers excellent responsiveness and stability across wide temperature and humidity ranges. The one-wire interface reduces wiring complexity, while the compact form factor and 1-meter cable make installation effortless. With its industrial-grade sensing, high-accuracy performance, and rugged enclosure, this probe is ideal for both stationary and mobile applications. Features: Designed with advanced CMOSens technology to deliver highly accurate humidity and temperature readings in challenging environments. Operates efficiently at 3.3V, making it suitable for battery-powered and portable devices. Works across extreme environmental conditions, including temperatures from -40°C to +125°C and pressures up to 150 bar. Encased in a stainless-steel breathable shell that resists corrosion, dust, chemical exposure, and moisture. One-wire digital interface ensures simple integration and minimal wiring requirements. Proven reliability in high-pressure, high-temperature, vacuum, and explosive environments. Built for long service life with strong resistance to oxidation and particulate blockage. Includes a 1-meter cable with a mini round shell connector for flexible installation in tight or specialized spaces. 7Semi High-Precision Temperature & Humidity Sensor Probe Pinout Diagram:

SmartElex Micro ISM330DHCX 6DoF IMU Sensor The SmartElex Micro ISM330DHCX 6DoF IMU Sensor is a compact motion-sensing module that combines an accelerometer and gyroscope to measure movement, orientation, and rotation. It helps users track motion data accurately in three-dimensional space, making it useful for students, hobbyists, engineers, and educators working on robotics, automation, and motion-based electronics. This IMU breakout board simplifies motion tracking in projects where stability, responsiveness, and precision are important, without requiring complex circuit design or calibration setups. This 6DoF IMU sensor is commonly used in self-balancing robots, gesture-controlled systems, IoT wearables, drones, and embedded automation projects that rely on movement or orientation feedback. It integrates smoothly with popular development platforms like Arduino, Raspberry Pi, and ESP32, making setup and data processing beginner-friendly and efficient. With dependable performance and straightforward compatibility, the SmartElex Micro ISM330DHCX is a practical choice for prototyping, academic learning, and product development where reliable motion tracking and sensor fusion are essential. Features: 6DoF IMU with built-in accelerometer and gyroscope for motion tracking Measures linear acceleration and rotational movement in real time Compact breakout board designed for easy integration in projects Compatible with Arduino, Raspberry Pi, ESP32, and similar platforms Ideal for robotics, drones, wearables, and gesture-based control systems Reliable module for prototyping, STEM learning, and embedded development

7Semi INA219 Triple-Channel DC Current Monitoring Sensor Breakout The 7Semi INA219 3-Channel DC Current Sensor Breakout is designed for makers, engineers, and system developers who need high-accuracy, real-time monitoring of voltage, current, and power across multiple DC loads. With three independent measurement channels, this board lets you track power usage holistically, ideal for multi-device systems, battery-powered projects, or performance-critical circuits. Its precise readings up to 26V and 3.2A make it a dependable choice for applications where stable power management matters. Equipped with an I2C interface, programmable addressing, and dual Qwiic I2C ports, this breakout simplifies integration into embedded systems, IoT setups, and advanced monitoring projects. Whether you’re optimizing battery health, managing motor loads, or evaluating system efficiency, this sensor board ensures reliable performance and accurate insights with embedded power-monitoring intelligence and flexible configuration options. Features: Provides three independent DC current-measurement channels, allowing simultaneous monitoring of multiple loads for comprehensive system analysis. Measures up to 3.2A current and 0–26V DC voltage with high accuracy, enabling precise power diagnostics in embedded systems. Uses a reliable I2C communication interface with 16 programmable addresses, supporting multi-sensor setups without conflicts. Offers dual Qwiic I2C ports for quick, solder-free connections and easy integration into existing development environments. Supports detailed monitoring of voltage, current, and calculated power, giving users full visibility into energy usage. Designed for battery management, motor control, IoT devices, and power-supply diagnostics requiring accurate real-time data.