Hi-Watt 9V Battery With 5V Buzzer, Snap Connector, Switch, 1K Ohm Resistor, LDR Photoresistor sensor and 5mm LED

7Semi SGP41 VOC Sensor Breakout Board for Indoor Air Quality Monitoring The 7Semi SGP41 VOC Sensor Breakout Board is a compact and reliable solution for monitoring indoor air quality with high precision. Built around Sensirion’s advanced SGP41 sensing technology, this VOC Sensor accurately detects volatile organic compounds, helping assess air freshness and pollution levels in real time. Operating at an exact 3.3V and communicating via an I2C interface, it integrates smoothly with popular microcontrollers and development boards. The onboard Qwiic connector simplifies wiring, making this air quality VOC sensor ideal for applications such as air purifiers, HVAC systems, smart buildings, and long-term environmental monitoring where accuracy and stability matter. Leverage the power of the SGP41 to create innovative air quality solutions. Whether you're developing air purifiers, ventilation systems, or environmental monitoring devices, this sensor breakout is your essential component. Features: Sensirion SGP40 Sensor: Provides accurate VOC and NOx detection for better air quality assessments. The Digital I2C Interface simplifies communication and integration with your system. Robust Construction: Designed to endure real-world situations while maintaining long-term stability. Compact design is ideal for applications that require limited space. Easy integration: Solderable headers allow for a simple connection.

SmartElex Tracker Sensor The SmartElex Tracker Sensor is a 5-channel analog IR sensor designed for reliable and accurate line detection in robotics applications. Unlike basic digital sensors, this line tracking sensor delivers precise analog values from all five channels, allowing smoother movement and better control in line-following robots. It works by measuring infrared reflectance, where white surfaces reflect more IR light and black lines absorb it, producing clear output differences. With a 1 cm to 5 cm sensing range, 16 mm sensor spacing, and 3.3V–5V operating voltage, this Tracker Sensor integrates seamlessly with Arduino, Raspberry Pi, and other microcontrollers, making it perfect for educational, DIY, and competitive robotics projects. Features: Five analog output channels allow for precise tracking. Infrared reflectance-based sensing. Improved accuracy compared to digital-only sensors. Detects white and black surfaces that change values. Detection range: 1cm-5cm Detector space: 16mm Compatible with 3.3V to 5V systems. Perfect for robotics and automation tasks.

SmartElex 5V 3A 4 Channel Signal Relay Module The SmartElex 5V 3A 4 Channel Signal Relay Module is a compact and reliable 4 Channel Relay Module designed to control four independent medium-power loads with precision. Powered as a 5V relay module, it integrates high-quality JY4100F-S-DC5V-C relays, each capable of switching up to 3A at 120V AC or 24V DC. With dedicated trigger inputs and LED status indicators for every channel, it allows easy monitoring and accurate switching. This module directly interfaces with popular microcontrollers such as Arduino, ESP8266, and Raspberry Pi, making it ideal for IoT, home automation, and embedded control applications where safety, isolation, and consistent performance are essential. Applications: Home automation (controlled lights, fans, and locks) Industrial machine control IoT multi-device projects. Robotics and Motor Control Security systems and alarms. Cautions: Always utilize a properly regulated 5V power supply. Avoid exceeding the rated load capacity. Provide proper isolation for AC loads. Store the module in a dry, clean place. Features: Four-channel relay module allows for independent control of four devices. Operates at 5V DC and has an active LOW/HIGH trigger. Each relay can handle up to 3A at 120V AC or 24V DC. Compatible with Arduino, ESP8266, Raspberry Pi, and more platforms. Each channel has its own set of LED indicators. Fast switching: ≤10 ms operation and ≤5 ms release time. Low contact resistance (≤100 mΩ) ensures effective operation. The total power consumption is around 1.44W over four channels. High insulation resistance and dielectric strength are essential for safety. Wide operational temperature range (-40°C to +85°C).

SmartElex PAM8403 5V Two-Channel Stereo Mini Class-D Audio Amplifier The SmartElex PAM8403 5V Two-Channel Stereo Mini Class-D Audio Amplifier is a compact audio amplification module designed to deliver clear and efficient stereo sound from low-power audio sources. It solves the need for adding audio output to small electronic projects without bulky components or complex circuits. This module is suitable for students, makers, engineers, educators, and startups who want an easy way to integrate stereo audio into DIY electronics, learning kits, and embedded system prototypes. This stereo mini Class-D audio amplifier is commonly used in robotics, IoT devices, automation systems, and portable electronics that require lightweight and power-efficient audio output. It can be easily interfaced with platforms such as Arduino, Raspberry Pi, and ESP32 to drive small speakers in projects like voice alerts, sound feedback systems, and interactive devices. The simple design and stable performance make it easy to integrate into both prototype builds and finished products, enabling reliable audio output with minimal setup effort. Features: Two-channel stereo Class-D audio amplifier for clear sound output Operates on a 5V power supply, ideal for embedded projects High efficiency design with low heat generation Compact size suitable for space-constrained applications Drives small speakers for stereo audio output Compatible with Arduino, Raspberry Pi, ESP32, and other audio-enabled projects

7Semi DC Buck Converter Breakout 3.8V 2A Out (AP62301) (BO-10132) The 7Semi DC Buck Converter Breakout 3.8V 2A Out (AP62301) (BO-10132) is a compact power module designed to step down higher DC voltages to a stable 3.8V output with up to 2A current. It supports a wide input voltage range, making it suitable for use with batteries, adapters, and other DC power sources in low-voltage electronics. Built on an efficient synchronous buck converter design, this module delivers reliable power with minimal heat and energy loss. Its small size makes it ideal for space-constrained projects such as IoT devices, embedded systems, and portable electronics. Whether you’re prototyping or building a final product, this buck converter offers a simple and dependable power solution. Features: Provides stable 3.8V output at up to 2A continuous current Accepts a wide DC input range for flexible power sources High-efficiency synchronous buck converter design Low heat generation for efficient power use Compact breakout board for easy integration Ideal for IoT, battery-powered, and embedded electronics Suitable for microcontrollers, sensors, and small devices

SmartElex 12V 10A Single Channel Automotive Relay Module The SmartElex 12V Relay Module is a compact and reliable 12V relay module designed to safely control high-power electrical loads using low-voltage signals from microcontrollers. It helps users switch devices like motors, lights, pumps, and automotive accessories without directly handling high current, making projects safer and easier to manage. This Single Channel Relay Module is well suited for students, makers, educators, engineers, and startups working on electronics, robotics, or automation projects where dependable load control is required. Built for real-world applications, this relay module integrates smoothly with popular development platforms such as Arduino, Raspberry Pi, and ESP32, making it ideal for robotics control systems, IoT automation, smart vehicles, and DIY prototyping. Its automotive-grade design ensures stable performance in demanding environments, while the simple input interface allows quick integration into new or existing projects. Whether you are building a prototype, an automation solution, or an educational demo, this module offers dependable switching and easy integration for everyday electronics applications. Note: Refer to datasheet in the ATTACHMENTS section for more info. regd. the product. Features: Supports safe switching of 12V DC loads in high-power applications Uses an automotive-grade relay for reliable and long-lasting operation Compact and durable design suitable for space-constrained setups Easy to interface with Arduino, Raspberry Pi, ESP32, and other controllers Low-power trigger allows efficient control using logic signals or switches Suitable for automotive systems, robotics, DIY electronics, and automation projects

7SEMI PT100 RTD Temperature Sensor Probe 2-wire 1m -70~300C The 7SEMI PT100 RTD Temperature Sensor Probe 2-wire 1 m (-70 ~ 300°C) (ES-13519) is a reliable temperature sensor designed to deliver accurate and stable readings across a wide temperature range. It uses a platinum PT100 RTD element, which is well known for precision and long-term consistency, making it suitable for both learning and professional applications. The sensor comes with a 1-meter cable and a sturdy stainless-steel probe that can handle demanding environments. Its simple 2-wire design makes it easy to connect with temperature controllers, data loggers, and microcontroller-based systems. Whether you’re working on industrial monitoring, laboratory experiments, or electronics projects, this PT100 probe offers a good balance of accuracy, durability, and ease of use. Features: Uses a PT100 platinum RTD element for accurate and stable temperature measurement Wide operating temperature range from -70°C to 300°C 2-wire configuration for simple and reliable connectivity Stainless steel probe for durability and long service life Comes with a 1-meter insulated cable for flexible installation Suitable for industrial, laboratory, and electronics projects Provides consistent readings over time with minimal drift

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.

Dual Micro USB 18650 LiPo DIY Power Bank Module (3.7V to 5V, 2A Output) The Dual Micro USB 18650 LiPo DIY Power Bank Module is designed to convert a 3.7V 18650 lithium battery into a stable 5V output with up to 2A current, making it perfect for charging smartphones, IoT devices, and other USB-powered gadgets. At its core, this module functions as a compact power management and boost conversion board, allowing you to build a fully customized portable power bank. It features dual Micro USB ports for convenient charging and integrated LED indicators to display charging and power status. Ideal for DIY enthusiasts, makers, and electronics hobbyists, this board gives you the flexibility to create your own reliable mobile power solution—provided you have basic electronic assembly knowledge. When installing items, it is important to keep the following in mind: Batteries can be connected in parallel with a voltage ranging from 3.2 to 4.2V, including 18650 flat and polymer batteries. We can connect the battery to the motherboard B + negative-, which is installed against the burning motherboard. Batteries that are new and old, or that have contradictory model brands, cannot be mixed. Features: Four-level LED bulb displays power, not working situation intelligent automated shutdown. The built-in lithium battery protection IC, overcurrent, overpressure, and undervoltage protection Dual USB output ports. Input requirements: 5V constant voltage power supply can charge input power, the most matching charger for 5V 1A or above. Requirements for rechargeable batteries: Compatible batteries include 18650 batteries, cell phone batteries, flat-panel batteries, MP3 batteries, and polymer lithium batteries ranging from 3.7V to 4.2V.

7Semi 1.27mm Pitch SHT41 Temperature & Humidity Sensor Breakout The 7Semi 1.27mm Pitch SHT41 Temperature & Humidity Sensor Breakout is a compact and high-performance sensing solution designed for modern embedded and IoT applications. Built around the advanced SHT41 Temperature & Humidity Sensor, it delivers precise environmental measurements with ±1.8% relative humidity accuracy and ±0.2°C temperature accuracy, ensuring reliable real-time data. Operating at 3.3V and consuming less than 0.15mA in low-power mode, this breakout board is optimized for long-term, battery-powered deployments. Its 16-bit digital output and flexible I2C communication with multiple address options allow seamless integration with popular microcontrollers, making it ideal for smart home systems, environmental monitoring, industrial automation, and portable electronics where accuracy, efficiency, and compact size are critical. Features: Sensing accuracy is ±1.8% RH (normal) in the 25%-75% range and ±0.2°C temperature, allowing for precise environmental observations. Ultra-Low Power Consumption: In low power mode, consumes less than 0.15mA, making it excellent for systems powered by batteries or limited electricity. The compact design features a 4-pin, 1.27 mm pitch header that allows for easy integration into dense PCB layouts. I2C Interface with Configurable Addresses: Simple to use using conventional I2C communication and pre-configured address settings. This technology has a wide range of applications, including intelligent buildings, IoT systems, industrial automation, smart homes, and environmental sensing. The temperature and humidity sensor is built using fourth-generation SHT40 digital sensor technology, ensuring long-term dependability and stability. Reliable Operating Range: Performs consistently from 0°C to 75°C under varying humidity levels.

CHAM CMINR14500F2 1000mAh 2C 3.6V AA Rechargeable Li-ion Battery Introducing the CHAM CMINR14500F2 rechargeable Li-ion battery – a compact, single-cell AA-sized power source delivering 3.6 volts at 1000mAh. Designed for projects that require a reliable 3.76V high-capacity supply, this battery is perfect for powering portable devices such as flashlights, hobby transmitters, and receivers. This Li-ion battery also serves as an excellent replacement for standard non-rechargeable AA batteries, making it a cost-effective and efficient option for applications like RC transmitter/receiver remotes. The versatile lithium ion battery terminals are compatible with many adapters or holders, or they can be permanently soldered to your device’s wiring for seamless integration. Important Guidelines: Avoid Deep Discharge: Do not let the Li-ion battery drop below 2.5V under load. Initial Charge: Fully charge to 4.2V before the first use. Metal and Magnets: Keep any metal moving parts or magnets away from both the positive (top) and negative (bottom) contacts. Proper Installation: Never force the battery into its compartment. Battery Pairing: Do not mix old and new battery cells. Charger Quality: Always use a reliable, high-quality battery charger. Heat Exposure: Keep the battery away from high temperatures. Prevent Short-Circuiting: Avoid connecting the positive (top) and negative (bottom) terminals directly. Safe Storage: When not in use, store the battery in its plastic holder or another insulating container. Charging Voltage: Do not exceed 4.22V during charging—this is another reason to choose a quality charger. Supervised Charging: Never leave the battery charging unattended. Long-Term Storage: Do not store the battery fully charged for extended periods. Optimal Storage Conditions: Store in a cool, dry place at about 3.7V (the recommended storage charge). Post-Discharge Care: Recharge the battery as soon as possible after it has been discharged. User Knowledge: Ensure you are well-informed about proper Li-ion battery discharging, charging, assembly, handling, and storage before use. Features Form Factor: Cylindrical Battery Type: Lithium-Ion Performance: High efficiency with substantial capacity Design Feature: Flat top for compatibility with a wide range of devices

7Semi MCP23017 I2C to 16 IO Expander Breakout Board The 7Semi MCP23017 I2C to 16 IO Expander Breakout Board is designed to expand the digital I/O capability of microcontrollers using the trusted MCP23017 I2C IO Expander IC. It provides exactly 16 configurable GPIO pins over a single I2C bus, reducing wiring complexity while maintaining stable performance. Each pin can be independently set as input or output, and the onboard interrupt feature allows the controller to respond instantly to pin state changes. This MCP23017 Breakout Board is compact, easy to integrate, and ideal for applications such as home automation, robotics, industrial control panels, and any project that requires multiple digital inputs and outputs without consuming extra microcontroller pins. Features: 16 I/O Pins: Converts two signal pins into sixteen completely customizable I/O pins. Multi-board Expansion: For larger applications, stack up to 8 boards to provide up to 128 I/O pins. Configure I2C addresses by setting the A0, A1, and A2 jumpers. Dual Connectivity: Includes PH2.0 terminal and solder pad choices for simple connection. Wide Compatibility: Compatible with both 3.3V and 5V systems, ensuring platform versatility. Interrupt Support: The INTA and INTB interrupt pins are used for real-time signal handling. Development Resources: Includes detailed instructions and sample projects for Raspberry Pi, Arduino, STM32, and micro. Easy Integration: The I2C interface, combined with a 4Pin 2.0 mm JST connector, provides for an easy and flexible connection to any MCU.

SmartElex TMP102 Digital Temperature Sensor The SmartElex TMP102 Digital Temperature Sensor is a compact and easy-to-use Temperature Sensor Module designed for accurate digital temperature measurement in Arduino, IoT, and embedded projects. Unlike analog sensors, this Digital Temperature Sensor communicates directly over the I2C bus, delivering stable and noise-free readings with a fine resolution of 0.0625°C and accuracy of ±0.5°C. It operates efficiently within a 1.4V to 3.6V range and includes onboard 4.7kΩ pull-up resistors for hassle-free I2C communication without level shifting. With added Molex PicoBlade connectors, an address jumper for flexible I2C addressing, and standard 0.1″ pin spacing for breadboard compatibility, this module is ideal for temperature monitoring, automation systems, and low-power electronics projects. Features: uses the I2C interface. I2C Address: 0x48 by default (three more addresses are also selectable). Resolution: 12-bit, 0.0625ºC. Typical temperature accuracy is 0.5ºC. 3.3 V sensor Supports up to four TMP102 sensors on the I2C bus at one time. 2 Molex PicoBlade Connectors

SmartElex BS612 PIR Motion Sensor Module The SmartElex BS612 PIR Motion Sensor Module is a passive infrared motion detection solution designed to sense human movement by detecting changes in infrared radiation. It helps automate electronic systems by enabling actions only when motion is detected, improving efficiency and reducing unnecessary power usage. This module is suitable for students, makers, engineers, educators, and startups who need a reliable motion sensing component for learning projects, prototypes, and embedded system designs. This PIR motion sensor module is commonly used in robotics, IoT devices, security systems, and home or industrial automation projects where accurate motion detection is required. It can be easily interfaced with popular platforms such as Arduino, Raspberry Pi, and ESP32, allowing quick integration into working systems. The wide detection coverage and stable performance make it ideal for applications like motion-activated lighting, alarm systems, smart monitoring solutions, and interactive electronics projects. Features: Passive infrared (PIR) sensor for accurate human motion detection Detects movement by sensing changes in infrared radiation Wide 120° detection angle for broader area coverage Long sensing range suitable for security and automation use Low power consumption for battery-operated projects Compatible with Arduino, Raspberry Pi, ESP32, and similar microcontrollers

ACEBOTT QE201 Wooden Board for ESP32 Basic Starter Kit (Expansion Pack) The ACEBOTT QE201 Wooden Board for ESP32 Basic Starter Kit (Expansion Pack) is a practical learning expansion designed to enhance the core ESP32 starter kit with real-world, hands-on projects. Built with wooden structural assembly support, this expansion enables users to create 37+ interactive projects such as a Smart Butterfly, Electronic Piano, Smart Watermelon Fan, Smart Barrier, and Smart Trash Can. It is fully compatible with Arduino and Blockly programming, making it ideal for beginners who want to learn electronics, coding, and automation in a simple and humanized way. The main core function of this expansion pack is to transform basic electronic concepts into physical smart models, helping users understand how embedded systems work through engaging and easy-to-build projects. Features: Supports 37+ practical expansion projects for ESP32 learning Designed for wooden structural assembly to build physical smart models Compatible with ACEBOTT QE201 ESP32 Basic Starter Kit Works with both Arduino and Blockly programming platforms Includes smart applications like Smart Butterfly, Electronic Piano, Smart Fan, Smart Barrier, Smart Trash Can Beginner-friendly design for easy assembly and understanding Humanized learning approach for interactive STEM education Suitable for students, hobbyists, and training institutes