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Development Boards

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WAVE-11638 RPi Relay Board for Raspberry Pi
US$26.59
The RPi Relay Board gives your Pi the ability to control high voltage/high current devices, easily makes normal home appliances become intelligent. Supports Raspberry Pi A+/B+/2B/3B. High quality relays, loads up to 250VAC/5A, 30VDC/5A. Photo coupling isolation, prevent interference from high voltage circuit. Onboard LEDs for indicating relays status. Relay control jumper, allows to control the relays by custom pins other than the default pins. Comes with development resources, including examples in wiringPi, WebioPi, shell, python, and bcm2835.
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SNSRKIT3G260 Sensor Kit w/ Electron + Data, 3G (Americas/Aus)
US$209.93
Quantify the world! The Sensor Kit is a curated mix of awesome sensors and electrical components specifically selected by the engineers on the Particle Team. If you want to measure temperature, sense loudness, measure distances, capture motion, or detect noxious gases, the Sensor Kit has you covered. Whether you’re building a connected robot or measuring the world around you, the Sensor Kit is the place to start. The Sensor Kit comes with a Particle SIM card with service in more than 100 countries worldwide, and includes 3 months of Particle's 1MB monthly data plan for IoT devices. All Electrons also include Particle's development tools, access to a cloud platform with messaging, and a SIM dashboard for managing and updating your new connected hardware. The Electron is a GSM-only device, and does not support CDMA networks.
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LED-BB-01 5050 SMD RGB LED Breakout Board
US$2.79
This is a simple breakout board for an integrated RGB LED module. Simple and easy to use as the board comes pre-soldered with the required resistors, all you need to do is interface the cables with a female jumper wire to your 5v microcontroller. This module has 3 separate LED's (Red, Green & Blue) which can be individually driven by applying a voltage to the appropriate module pin. By mixing different color intensities an almost unlimited range of colors can be created.
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LED-BB-10 Addressable single WS2812 LED module, pack of 10
US$5.59
This is a breakout board for the WS2812B RGB LED. The WS2812B is actually an RGB LED with a WS2811 built right into the LED! All the necessary pins are broken out to 0.1" spaced solder pads for easy wiring. Several of these breakouts can even be chained together to form a display or an addressable string.
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ARD-UNIVERSAL SunFounder Universal Kit V2.0 for Arduino
US$27.99
This Arduino Introductory Kit contains the basic components, all explained by an excellent 35 page color manual,  required to initiate you into the wonderful world of Arduino. This kit does not contain an Arduino UNO.
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PI-SENSE-HAT, Raspberry Pi Sense HAT V2
US$60.13
The Raspberry Pi Sense HAT V2 is the perfect product to learn about programming and how we interact with the world around us. With its full array of sensors, the Sense HAT was originally developed for use on the International Space Station, as part of the educational Astro Pi programme run by the Raspberry Pi Foundation in partnership with the European Space Agency.
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OM-UE-GPS GPS Expansion for Onion Omega
US$41.93
The GPS Expansion for the Onion Omega is a USB-based expansion that allows your Omega to pinpoint its location using both GPS as well as China’s Beidou satellite positioning systems. It comes with an on-board GPS antenna as well as a built-in u.FL connector to attach your own antenna. Technical Details: Accuracy: 1.8m, Search channels: 66, Tracking channels: 22, Sensitivity: -165 dBM, Update rate: 10 Hz.
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ARD-EXTREME Arduino Educational Kit
US$72.57

This is an action-packed and low-cost Arduino Kit. It includes all the components required to not only get you started, but also to allow you to deep-dive into more advanced components like RFIDs. It does not include an instruction manual. However at this point Arduino is so popular that a Google search on how to use any component will result in many tutorials.

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12015 Me Dual DC Motor Driver
US$19.59
Makeblock Me Dual DC Motor Driver is the improvement version of Me Motor Driver V2.1. With on board RJ25 ports, you can drive two DC motors at a constant current of 1A (2A peak). The motor driver IC on the board is TB6612, TB6612 is a high efficiency MOSFET driver, with low heat dissipation. Over current protection included to stop the driver IC burned out. 
Delivery within 2-3 weeks
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BB-DB25S, DB25 SCREW TERMINAL BREAKOUT CONNECTOR (FEMALE)
US$9.23
This convenient DB25 Female breakout board has screw terminals to allow easy wiring and monitoring of all 25 pins from a DB25 connection. Each of the pin connections are labelled by pin number.
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BB-DB9S DB9 SCREW TERMINAL BREAKOUT CONNECTOR
US$6.15
This convenient DB9 Female breakout board has screw terminals to allow easy wiring and monitoring of all 9 pins from a serial RS232 port connection. Each of the pin connections are labelled by pin number and function.
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DEV-13814 Smooth Thread Bobbin - 12m (Stainless Steel)
US$7.62
This is 12 meters of smooth conductive thread spun from stainless steel fiber and wound on a plastic bobbin. Use it to sew up all of your e-textile projects. This small bobbin is a great way to get into wearable electronics without the upfront cost of buying an entire spool of thread. Close to 40 feet of thread is enough to get a simple design stitched onto your shirt, backpack or hat.
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VEL-MM209 CLASS D AUDIO AMPLIFIER - MONO 2.8 W
US$27.23
Small but powerful amplifier for a wide range of applications, for example MP3 player, melody generator, intercom, sound effects, headphones, radio receiver, PC sound card, music instrument...
Delivery within 2-3 weeks
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2923-ADA Adafruit Latching Mini Relay FeatherWing
US$13.92
This is the Latching Mini Relay FeatherWing. It gives you power to control, and control over power. Put simply, you can now turn on and off lamps, fans, solenoids, and other small appliances that run on up to 250VAC or DC power using any Feather board.
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BB-TXB0108 8 Channel Bi-directional Logic Level Converter TXB0108
US$9.16
It is a 8 channel or 8-bit logic level converter that is great for interfacing sensors or 3.3v logic components with 5v logic level microcontrollers. This unit will do the level shifting required to allow theses device to communicate without burning out each other. On the right side Vb is the input voltage reference of 5v, whereas Va and OE is the input reference of 3.3v.
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