DFRobot Gravity 7/24 Industrial Analog pH Meter Kit for Arduino & Raspberry Pi Project

Official Raspberry Pi 4 Model B 4GB RAM The Raspberry Pi 4 Model B 4GB is a compact and versatile single-board computer that provides desktop-level performance in a credit card-sized device. The RPI 4B is powered by a Broadcom Quad-Core Cortex-A72 (ARM v8) 64-bit SoC that runs at 1.5GHz and has 4GB of LPDDR4-3200 SDRAM for efficient multitasking and basic desktop programs. This device is designed for a wide range of DIY projects, including media centres, file servers, robotics, and smart home systems. The Raspberry Pi 4B 4GB supports dual 4K displays ( 4K@30Hz ) through its micro-HDMI ports, making it perfect for high-definition video and creative endeavours. It has dual-band WiFi 2.4 GHz and 5.0 GHz IEEE 802.11ac , Bluetooth 5.0 , and Gigabit Ethernet for a consistent connection. It also features two USB 3.0 connections and two USB 2.0 ports to connect devices. The Raspberry Pi 4 4GB is popular among programmers and makers. It comes with native Python support , making it a fantastic platform for coding education and automation project development. It is capable of running both 32-bit and 64-bit operating systems , offering versatility for different uses. Whether for teaching, prototyping, or creative projects, it serves as a potent and affordable computing option. Shop Raspberry Pi 4 4GB Full Kit – Plug & Play Setup Affordable power for your projects – Raspberry Pi 4 2GB ! What makes this model Great? The speed and performance of the new Raspberry Pi 4 4GB are a noticeable improvement from earlier models. For the first time, the Raspberry Pi Foundation has created a complete desktop experience. Whether you're editing documents, browsing the web with multiple tabs open, managing spreadsheets, or creating a presentation, you'll find the experience smooth and familiar. It is a more energy-efficient and cost-effective machine. Features Broadcom 2711 Quad-Core Cortex A72 @ 1.5GHz delivers 20% faster performance with improved power and thermal efficiency. Dual micro-HDMI outputs support dual 4K displays with hardware video decode at 4Kp60 (H.265, H.264, MPEG-4). Dual-band WiFi (802.11b/g/n/ac) on 2.4GHz & 5GHz with advanced PCB antenna for robust wireless connectivity. Bluetooth 5.0 offers an extended range of wireless peripherals. Upgraded USB 3.0 Ethernet provides wired speeds up to 10x faster than previous models. 2 USB 3.0 and 2 USB 2.0 ports enable versatile peripheral connections. 40-pin GPIO header is fully backwards-compatible with earlier Pi models. Optional PoE support is available, with PoE header pins designed to work with proper standoffs. Comparison Table Raspberry Pi 4 Model B Raspberry Pi 5 Raspberry Pi 3 Model B+ Price (INR) ?3599 VIEW ?5129 VIEW ?3649 VIEW Processor 1.5GHz Quad-Core ARM Cortex-A72 2.4GHz Quad-Core ARM Cortex-A76 1.4GHz Quad-Core ARM Cortex-A53 RAM 1GB, 2GB, 4GB, 8GB LPDDR4 2GB, 4GB, 8GB, 16GB LPDDR4 1GB LPDDR2 Wi-Fi Dual-band 802.11ac Dual-band 802.11ac Dual-band 802.11ac Bluetooth 5.0 5.0 4.2 USB Ports 2× USB 3.0, 2× USB 2.0 2× USB 3.0, 1× USB 2.0 4× USB 2.0 Ethernet Gigabit Ethernet Gigabit Ethernet Gigabit Ethernet Video Output 2× Micro HDMI (4Kp60) 2× Micro HDMI (4Kp60) 1× HDMI (1080p) GPIO Pins 40 40 40 Storage MicroSD (SDXC up to 2TB) MicroSD (SDXC up to 2TB) MicroSD (SDHC) Power Supply USB-C USB-C Micro USB Click for Complete Raspberry Pi Kits – Learn, Build, and Innovate! Pin Diagram:

7Semi PCA9306 I2C Bidirectional Voltage Level Translator Breakout Board The 7Semi PCA9306 I2C Bidirectional Voltage Level Translator Breakout Board is a compact and efficient PCA9306 voltage level translator designed to safely interface I2C and SMBus devices operating at different logic levels. Supporting voltage translation from 1.2V to 5.0V, this board enables seamless communication between low-voltage sensors and higher-voltage microcontrollers without manual direction control. As a dependable I2C logic level converter, it delivers minimal signal delay and stable bidirectional data flow, making it ideal for robotics, industrial controllers, embedded systems, and DIY electronics projects requiring precise mixed-voltage I2C communication. Allowable Voltage Level Translation The breakout can transfer voltages ranging from 3.3V to 5V. VREF1 (Low Side) VREF2 (High Side) 1.2V 1.8V, 2.5V, 3.3V, 5V 1.8V 2.5V, 3.3V, 5V 2.5V 3.3V, 5V 3.3V 5V Features: Wide Voltage Range Support: Operates between 1.2V and 5.0V, accommodating a wide range of components. Dual Bidirectional Channels: Translates both the SDA and SCL lines for complete I2C compatibility. I2C and SMBus Protocol Support: Fully compatible with regular and fast-mode I2C devices, as well as SMBus peripherals. No Direction Pins Required: Signal direction is automatically detected for easier design. Low propagation delay: A delay of less than 1.5ns maintains data integrity at high speeds. 5V Tolerant I/O Ports: Securely links 5V signals to lower voltage devices. Compact and simple to use: ideal for embedded applications, prototyping, and compact systems.

24v 0.15A Brushless DC Fan The 24v 0.15A Brushless DC Fan is a compact and reliable cooling solution designed for efficient airflow in electronics and industrial applications. This dc brushless fan 24v features a high-performance brushless motor that ensures low noise, reduced power consumption, and extended lifespan compared to traditional fans. Its centrifugal blower-style design directs air precisely where needed, making it perfect for 3D printers, control cabinets, power supplies, and embedded systems. With a 24V DC operating voltage and 0.15A current rating, it delivers consistent cooling performance while maintaining energy efficiency. Built with durable housing and easy mounting points, this fan is ideal for continuous operation environments. Features: Efficient cooling performance Stable 24V DC operation Low power consumption Quiet and smooth airflow Compact and space-saving design Durable brushless motor technology Easy installation and wiring Ideal for electronics and enclosure cooling

SmartElex 12V 7A Single Channel Power Relay Module The SmartElex 12V 7A Single Channel Power Relay Module is a dependable switching solution designed to control higher-power electrical loads using low-voltage control signals. It helps protect microcontrollers and sensitive electronics by providing proper isolation between the control circuit and the load side. This module is suitable for students, makers, engineers, educators, and startups who are working on control systems, automation projects, or embedded applications that require safe and reliable power switching. This single channel power relay module is ideal for robotics, IoT systems, home automation, and industrial control projects where devices such as motors, lights, pumps, or other electrical equipment need to be switched reliably. It can be easily interfaced with popular development platforms like Arduino, Raspberry Pi, and ESP32, making it convenient for both prototyping and final product integration. The simple design and consistent performance allow users to build stable control systems without added complexity. Features: Single channel power relay module for high-load switching Operates on 12V, suitable for automation and control systems Supports up to 7A load current for power applications Electrical isolation between control side and load side for safety Compatible with Arduino, Raspberry Pi, ESP32, and similar boards Compact and durable design for easy integration into projects

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.

7Semi ACS772 50A 200KHz Current Sensor, Automotive Grade The 7Semi ACS772 50A 200 kHz Current Sensor is a high-performance current sensor module designed to accurately measure both AC and DC currents up to 50 A with a wide frequency response. Built with automotive-grade components, it delivers dependable and precise current sensing in demanding environments where stability and safety are critical. This sensor addresses the common challenge of obtaining accurate current measurements in power electronics, motor control, and battery systems, helping you monitor and protect circuits effectively. With its broad bandwidth of up to 200 kHz and robust design, the ACS772 current sensor module offers fast response, excellent linearity, and low noise, making it suitable for a wide range of applications. It’s perfect for students and hobbyists working on robotics or power monitoring, as well as professionals developing automotive systems, industrial equipment, and high-speed power electronics. The module’s ease of integration and reliability make it a practical choice for projects requiring real-time current feedback and protection. Features: High-accuracy current sensing with ±2.1% lifetime accuracy across temperature ranges Supports AC and DC current measurement for demanding power applications Ultra-low 100 µΩ internal conductor resistance for minimal power loss Reinforced galvanic isolation for safe high-side current monitoring Excellent noise immunity with advanced amplifier and filtering design Factory-trimmed gain and offset for consistent, reliable performance Compact, automotive-grade package for easy integration and mounting

SmartElex MicroB USB Breakout Board The SmartElex MicroB USB Breakout Board is a compact adapter board designed to make it easy to access the pins of a Micro-B USB connector for prototyping, development, and testing. It breaks out the USB port into simple pin headers, allowing users to interface USB power and data lines with custom circuits, breadboards, and microcontroller boards. This USB breakout board is ideal for students, makers, educators, and engineers who need a quick and reliable way to add USB connectivity to their electronics projects without designing a custom PCB. This board is commonly used in robotics, IoT applications, embedded system development, device repair, and hardware prototyping where USB access is required for powering circuits or transferring data. It works smoothly with platforms like Arduino, Raspberry Pi, and ESP32, enabling fast integration with both beginner and advanced projects. With its straightforward layout and sturdy connector design, the SmartElex MicroB USB Breakout Board is a practical and efficient choice for workshops, prototyping labs, and DIY electronic builds that require stable Micro-B USB interfacing Features: Micro-B USB connector broken out to easy-to-use header pins Simplifies USB power and data access for prototyping and testing Supports quick integration with breadboards and custom circuits Compatible with Arduino, Raspberry Pi, ESP32, and microcontrollers Ideal for DIY repairs, IoT projects, and embedded hardware development Compact and beginner-friendly design for rapid project setup

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

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 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

7Semi EC200U 4G LTE Cat 1 Dongle with GNSS Positioning The 7Semi EC200U 4G LTE Cat 1 Dongle is designed to deliver stable, high-speed connectivity for industrial systems, IoT deployments, and edge computing devices. Powered by the reliable Quectel EC200U-CN module, it supports LTE Cat 1, GSM, and GPRS networks, making it a dependable choice for projects that require continuous wireless communication. Its plug-and-play USB design ensures quick setup on Windows, Linux, and embedded platforms like Raspberry Pi or industrial PCs. Along with strong cellular performance, the dongle features integrated GNSS positioning, supporting GPS, GLONASS, BeiDou, Galileo, and QZSS for accurate tracking. Whether used for remote monitoring, automation, telemetry, or cloud-connected devices, this LTE Cat 1 dongle offers seamless integration, reliable communication protocols, and long-term durability making it ideal for modern IoT and industrial connectivity needs. Features: Supports LTE Cat 1, GSM, and GPRS networks for dependable wireless connectivity. Delivers stable data speeds up to 10Mbps downlink and 5Mbps uplink for real-time communication. Integrated GNSS engine supports GPS, GLONASS, BeiDou, Galileo, and QZSS for accurate positioning. Plug-and-play USB interface with wide compatibility for Windows, Linux, Raspberry Pi, and industrial hosts. Supports multiple communication protocols including TCP, UDP, HTTP, MQTT, HTTPS, NTP, FTP, SSL, and more. Features a nano SIM card slot (1.8V/3V) for flexible network access. Reliable build quality designed for continuous industrial operation. Flexible antenna design for enhanced signal performance in challenging environments.

SmartElex 8 Channel Multiplexer Breakout Module – (74HC4051) The SmartElex 8 Channel Multiplexer Breakout Module (74HC4051) is a compact and efficient solution for expanding input and output options in electronic projects. This 74HC4051 multiplexer breakout allows users to route multiple signals through a single microcontroller pin, solving the problem of limited I/O availability when working with sensors, switches, or analog inputs. It is designed for students, makers, engineers, educators, and startups who need a practical way to manage multiple device connections without increasing hardware complexity. This module acts as both an 8 channel multiplexer and demultiplexer, making it suitable for robotics, IoT systems, automation tasks, and rapid prototyping. It integrates smoothly with Arduino, Raspberry Pi, ESP32, and similar platforms, enabling users to scale projects without sacrificing performance or stability. Whether you are building sensor hubs, data acquisition systems, or experimenting with signal routing, this multiplexer demultiplexer module offers a reliable and easy-to-use interface that enhances flexibility in circuit design. Features: Based on the 74HC4051 8-channel analog/digital multiplexer IC Expands I/O by routing up to 8 signals through a single control interface Works as both a multiplexer and demultiplexer for flexible signal routing Helps manage limited microcontroller pins in multi-sensor projects Compatible with Arduino, Raspberry Pi, ESP32, and similar platforms Ideal for robotics, IoT systems, data acquisition, and prototyping

SmartElex LIS3DH Triple Axis Accelerometer Breakout The SmartElex LIS3DH Triple Axis Accelerometer Breakout is a compact motion sensor module designed to measure acceleration along the X, Y, and Z axes. It helps users detect tilt, vibration, movement, and orientation, making it ideal for students, makers, educators, and engineers working on motion-responsive electronics. This lis3dh accelerometer offers a beginner-friendly way to collect movement data without complex circuitry, allowing users to focus on learning, building prototypes, or integrating sensors into real-world applications. This 3-axis accelerometer sensor is commonly used in robotics, handheld electronics, IoT devices, gesture recognition systems, and automation projects that require accurate motion sensing. It integrates smoothly with Arduino, Raspberry Pi, ESP32, and other microcontroller platforms, making programming and hardware connections straightforward. With reliable output and easy compatibility, the SmartElex LIS3DH sensor is a practical choice for prototyping, academic learning, DIY electronic builds, and product development where consistent acceleration measurement is required. Features: Triple-axis accelerometer for detecting movement and orientation Measures acceleration along X, Y, and Z axes with reliable output Compact breakout board for easy integration in embedded projects Compatible with Arduino, Raspberry Pi, ESP32, and similar platforms Ideal for robotics, IoT devices, gesture control, and automation projects Great for prototyping, STEM education, and motion-based product development

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 Vikram-3025 High-Power 25A DC Motor Driver for 6–30V Motors The 7Semi Vikram-3025 is a heavy-duty single-channel DC motor driver built for demanding robotics, automation, and mechatronics projects. Designed to handle 25A continuous load with a 6V–30V operating range, it uses a high-efficiency discrete NMOS H-Bridge that eliminates the need for bulky heat sinks. Whether you're powering high-torque DC motors or creating reliable industrial controls, this driver ensures stable, smooth, and responsive performance. With built-in safety features like overcurrent protection, temperature protection, and undervoltage shutdown, your system stays secure even under heavy loads. This motor driver goes beyond basic control, it includes onboard test buttons, motor output LEDs, and a regulated 5V output for powering microcontrollers, making prototyping extremely convenient. It supports PWM/DIR control signals from a wide range of logic voltages (1.8V to 30V), ensuring compatibility with Arduino, Raspberry Pi, PLCs, and other controllers. It also offers manual control options using a potentiometer and switch, giving both beginners and advanced users flexible control in real-world applications. This makes it a dependable choice for custom robotics, high-power motor control, and automation systems. Features: Provides smooth and reliable bidirectional control for single brushed DC motors. Supports a wide operating voltage range from 6V to 30V for flexible motor compatibility. Handles a continuous motor current of 25A, ideal for high-load or high-torque applications. Includes an onboard 5V regulated output (250mA) to power a microcontroller without an external supply. Onboard test buttons and motor state LEDs allow quick, controller-free testing during prototyping. Offers dual input modes: PWM/DIR for digital control or potentiometer/switch for manual operation. Compatible with 1.8V, 3.3V, 5V, 12V, and 24V logic, making it suitable for Arduino, Raspberry Pi, PLCs, and more. Supports PWM input frequency up to 40kHz with a fixed 16kHz output for quiet motor operation. Built-in protections include active current limiting, overcurrent protection, temperature protection, and undervoltage shutdown.