CJMCU-6701 GSR Skin Sensor Module Analog SPI 3.3V/5V The CJMCU-6701 GSR Skin Sensor Module is a biosensor module that measures the electrical conductance of the skin, also known as the Galvanic Skin Response (GSR). The module can be used to monitor changes in skin electrical conductance as a result of stress, emotions, or other physiological circumstances. This has a wide range of applications, including deception detection, human-computer interaction, and stress monitoring. The module is available in Analog, SPI, and 3.3V/5V versions, allowing it to be integrated into systems using 3.3V or 5V voltage and communicating with the microcontroller via the SPI protocol. The module is small in size and can be used in various other of applications. The working principle of the GSR sensor is based on the fact that the electrical conductance of the skin changes based on the level of sweat production. Sweat production is influenced by the level of emotional or physical arousal, thus changes in conductance can be used to infer changes in emotional or physiological states. GSR sensor clicks are ideally suited as an experimental tool for research, as well as for establishing effective test applications based on EDA reactions - such as polygraphs.

Coin type battery holder 24mm This is a coin cell battery holder. It's fast, cheap, reliable, and works on all sizes and shapes of coin cells. The holder can be easily taped, glued, soldered, or bolted to a project. It even has built-in holes for sewing into wearable electronic fashions. And best of all it can be made with stuff you probably have on hand. A button battery holder adapted to be inserted into electronic equipment is disclosed. As the battery holder is mounted into the electronic equipment in the direction parallel to the electrode surfaces of the button battery, a battery holder insert hole and a battery holder mounting portion to be formed in the electronic equipment can be made small, thereby contributing to a reduction in the size of the electronic equipment. Applications: Portable Devices Computers & Computer Peripherals Consumer Electronics Power Management Commercial Security

Cytron Maker UNO Microcontroller Board for Arduino Education The Cytron Maker UNO is an Arduino-compatible board crafted specifically for Arduino education and ideal for students, educators, and makers. Designed to simplify the learning process, this microcontroller development board comes packed with built-in components like 12 LEDs, a piezo buzzer, and a push button—making it easy to dive into coding and electronics right out of the box. Unlike conventional Arduino boards, the Maker UNO board eliminates the need for an external circuit setup, helping beginners focus on learning and creating without getting overwhelmed. It supports the Arduino UNO R3 framework and is fully programmable via the Arduino IDE, ensuring compatibility with existing example codes and libraries. With onboard LED indicators for each pin, troubleshooting becomes intuitive and efficient. The Cytron Maker UNO is more than just a board—it's the perfect tool to ignite the maker spirit and start building with confidence. Features: SMD ATmega328P microcontroller (the same microcontroller used in Arduino UNO) with the Optiboot (UNO) bootloader The CH340 facilitates USB programming. Input voltage: USB 5V via computer, power bank, or regular USB adapter. Piezo buzzer will function as a simple audio output ISP 6-Pin Header R3 Shield Compatible LED array with 5V, 3.3V, TX, RX, and all digital pins. Utilize the USB Micro-B socket. Purple PCBs! Additional Features: One of the most impressive aspects of the official Arduino Uno is the label printed on the pin headers. It saves us a significant amount of time when connecting the I/O pins to an external circuit. So, we provide a set of these label stickers for pin headers with each Maker UNO! (Please keep in mind that you must peel off the stickers and put them to your Maker UNO on your own.) Students consistently get their boards messed up. Maker UNO allows you to write your name on the board. Problem is solved! Do not throw away your box! There is a small aperture on the box where you may plug the USB cable, allowing you to retain your Maker UNO safely in its original box with no additional casing necessary.

Cytron MOTION:BIT Robotics Expansion Board for micro:bit The Cytron MOTION:BIT is a powerful and compact robotics expansion board for micro:bit, engineered to accelerate development in educational and hobbyist robotics projects. Featuring an integrated 4-channel DC motor driver, the board simplifies the control of multiple motors, making it perfect for advanced robotics applications. It comes equipped with a built-in 18650 Li-Ion battery, rechargeable via USB, ensuring reliable and portable operation. Additional support for external AA battery power enhances flexibility for field projects. With 11 status LEDs and Neopixel RGB LEDs onboard, users gain instant visual feedback and the ability to implement colorful lighting effects. The included GPIO ports make it easy to interface with a variety of sensors and devices. Whether you're building a STEM project or a prototype, the Cytron MOTION:BIT expansion board is the go-to choice for enhancing your micro:bit robotics experience. Features: Multiple Power Options: Rechargeable 18650 lithium-ion battery or external power (e.g., AA batteries) GPIO Ports: Breakout to GVS format with additional VCC and GND pins. Motor Control: 4-channel DC motor driver; supports up to eight servo motors. LED indicators: 11 status LEDs and two inbuilt Neopixel RGB LEDs. Color-coded ports: prevents incorrect polarity connections. External Switch: A shock-resistant ON/OFF switch for dependability and lifespan.

Cytron REKA:BIT Expansion Board for Robotics (without micro:bit) The Cytron REKA:BIT Expansion Board for Robotics (without micro:bit) is a compact yet feature-rich platform designed to empower learning and innovation in STEM education. As the smaller sibling of the EDU:BIT, this REKA:BIT for micro:bit board enables students and makers to build interactive projects with ease. It supports programming in Microsoft MakeCode using blocks, JavaScript, and Python, making it accessible for learners at various skill levels. This versatile micro:bit expansion board can control DC motors, servos, and RGB LEDs, and comes equipped with Grove ports for quick sensor integration. With onboard indicator LEDs and robust power protection, the Cytron REKA:BIT is ideal for hands-on classroom activities, DIY electronics, and robotics competitions, making it a valuable tool for any young innovator. REKA:BIT Pinout Diagram: Note: This product does NOT include micro:bit board. Features: Motor control features 2 DC motor terminals with rapid test buttons and 4 servo motor ports. LEDs include 2 RGB and comprehensive indicator LEDs for troubleshooting. Connectivity includes 6 Grove ports (3.3V), 3 Analog/Digital IO ports, and 2 Digital IO interfaces. I2C support facilitates integration with additional peripherals. Power Management includes DC input (3.6-6V), undervoltage and overvoltage indications, and safety.

D1(ESP-12E) WiFi Development Board This is ESP8266 D1 R1 V2.1.0 WiFi Development Board. The D1 is an ESP8266 WiFi based board that uses the Arduino layout with an operating voltage of 3.3V. The board is controlled by the ESP8266 chip (a 32-Bit processor) and has a larger flash memory compared to an Arduino Uno . It consists of 11 digital I/O pins and 1 analog (input) pin. the board can be connected using a Micro-B type USB cable . The D1 R1 is a WiFi capable ESP8266EX based development board in the form of the Arduino UNO board format. This board is compatible with the Arduino IDE and with NodeMCU. The D1 R1 also features an onboard switching power supply which allows you to power the board from a power supply up to 12V.

DB9 Female Straight Connector The most popular kind of electrical connector is DB9 Female straight Connector. The D-sub minuscule (D-sub) connector plug and socket family includes the DB 9 connector, which is used with computers and other communication equipment. A five-pin row sits above a four-pin row in the arrangement of DB-9 pins, which are organized in rows of two. The EIA/TIA 232 serial interface standard established the purpose of each of the nine pins as a standard so that different manufacturers may incorporate them into their products. DB9 connections are made to work with this standard. Keyboards, mouse, joysticks, and other serial peripheral devices were frequently connected using these connectors . For data communication, they are also utilized in DB9 cable assemblies. Today, more advanced interfaces like USB, PS/2, Firewire, and others have mostly taken the place of the DB9. However, the DB9 interface is still widely used by many vintage devices for serial communication. Applications: Network ports. Computer video output. Game controller ports. Linear and rotary encoders in industries.

DC-DC Charge Discharge Integrated Module (5V/2A) DC-DC Charge Discharge Integrated Module is your go-to solution for efficient power boosting. This module, with a normally open 5V output, guarantees uninterrupted power, unaffected by load access, and supports simultaneous charging and discharging. The built-in power management circuit ensures a seamless boost from lithium batteries, while the battery protection feature adds an extra layer of security. This module finds its application in car charging retrofits, driving recorder power supplies, DIY mobile power banks, and as a reliable portable charging device for phones and laptops. With button-controlled output and 4 levels of charge/discharge electricity indication, it provides user-friendly control and convenience. Crafted with efficiency in mind, this module boasts a charge efficiency of ?91% and discharge efficiency of ?96%, maintaining a balance between input and output for an extended service life. The compact design, measuring 25*16mm, ensures versatility in various projects. This DC-DC Charge Discharge Integrated Module is designed to meet your power needs reliably and efficiently. Features: 4 levels of charge/discharge electricity indication Button-controlled output Built-in power management circuit Applications: Car charging retrofit Driving recorder power supply DIY mobile power bank Mobile phone/laptop portable charging device DC-DC Charge Discharge Integrated Module pinout

DC-DC SX1308 Step-up Adjustable Power Module The SX1308 Adjustable Power Supply is a DC-DC step-up module that has a maximum output power of 28V and 2A, utilizing a 1.2Mhz power booster module with an SX1308 chip. The SX1308 chip comes in a small package with high efficiency, and its output power can be easily adjusted. This booster module has an integrated MOSFET with the lowest RDS internal resistance of 100m?, which allows it to generate large current outputs of up to 2A. Features Oscillation frequency 1.2MHz efficiency is as high as 95% The circuit has short circuit protection, overheating protection function 10k to adjust potentiometer, adjust the output voltage Applications 3G network products digital products mobile power supply battery power supply, equipment, etc.

DFRobot 20W DC-DC Buck Converter Power Module 7-24V to 5V 4A The DFRobot 20W DC-DC converter is a high-efficiency buck converter module that steps down 7–24V input to a stable 5V/4A output, ideal for powering high-current devices. With 6 onboard output ports, it can simultaneously power components like servo motors, programmable LED strips, and robotic arms. The module features durable ceramic chip capacitors and a large inductor to reduce heat, making it a reliable 5V power supply for robotics, automation systems, and DIY electronics projects.