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DescriptionArduino is an open-source physical computing platform based on a simple i/o board and a development environment that implements the Processing/Wiring language. Arduino can be used to develop stand-alone interactive objects or can be connected to software on your computer(e.g. Flash， Processing， MaxMSP). The open-source IDE can be downloaded for free(currently for Mac OS X， Windows， and Linux).The Arduino Mega is a microcontroller board based on the ATmega2560. It has 54 digital input/output pins(of which 14 can be used as PWM outputs)， 16 analog inputs， 4 UARTs(hardware serial ports)， a 16 MHz crystal oscillator， a USB connection， a power jack， an ICSP header， and a reset button. It contains everything needed to support the microcontroller； simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.Never fear for accidental electrical discharge， either since since the Mega also includes a plastic base plate to protect it!The Mega 2560 R3 also adds SDA and SCL pins next to the AREF.In addition， there are two new pins placed near the RESET pin. One is the IOREF that allow the shields to adapt to the voltage provided from the board.The other is a not connected and is reserved for future purposes.The Mega 2560 R3 works with all existing shields but can adapt to new shields which use these additional pins.Not sure which Arduino or Arduino-compatible board is right for you? Check out our Arduino Buying Guide!FeaturesATmega2560 microcontrollerInput voltage - 7-12V54 Digital I/O Pins(14 PWM outputs)16 Analog Inputs256k Flash Memory16Mhz Clock Speed

DescriptionThe MQ-9B is a CO and CH4 gas detection sensor form Winsen. The sensing material of the MQ-9B is SnO2， which has a low conductivity in clean air. It detects carbon monoxide(1.5V)by method of cycling high and low temperature. The sensor's conductivity gets higher with the CO and CH4 gas concentration rising. The sensing range is 10-500ppm CH4. A simple circuit makes measuring this change in conductivity and turning it into data fairly straight-forward， but does require some calibration.For easy Solderability； use our Gas Sensor Breakout Board.

DescriptionWe are quite familiar with seven-segment displays. We see them on our alarm clocks， ovens， and microwaves. By adding more segments to each digit you can display more than just numbers! Introducing the brand new SparkFun Qwiic Alphanumeric Display. These white fourteen-segment digits allow you display all sorts of numbers， characters， and symbols. With Qwiic， simply plug it in and go. No soldering， no figuring out which is SDA or SCL， and no voltage regulation or translation required!The SparkFun Alphanumeric Display Arduino library makes printing strings to the display as easy as calling the print()function. With this library， you'll be able to send I2C commands to the VK16K33 LED driver chip to light up segments(including the decimal point or colon)and even scroll your string across the display. You can download the library through the Arduino library manager by searching 'SparkFun Alphanumeric Display' or you can get the GitHub repo as a .zip file and install the library from there.The VK16K33 also supports I2C address configuration. Simply close a combination of the address jumpers on the back and you can communicate with up to four displays on the same bus. Our slim board design also features detachable stand off holes， vertical Qwiic connectors， and internal mounting holes.The SparkFun Qwiic Connect System is an ecosystem of I2C sensors， actuators， shields and cables that make prototyping faster and less prone to error. All Qwiic-enabled boards use a common 1mm pitch， 4-pin JST connector. This reduces the amount of required PCB space， and polarized connections mean you can't hook it up wrong.Get Started with the Qwiic Alphanumeric Display Hookup GuideFeaturesWhite displayOperating Voltage：3.3VIntegrated RC oscillatorMaximum display segment numbers：128 patterns13×3 matrix key scan circuit16-step dimming circuitI2C Addresses：0x70(0x71， 0x72， 0x73)2x Qwiic connectors2x Wall Mounting Points

DescriptionThe SparkFun Alphanumeric Display Arduino library makes printing strings to the display as easy as calling the print()function. With this library， you'll be able to send I2C commands to the VK16K33 LED driver chip to light up segments(including the decimal point or colon)and even scroll your string across the display. You can download the library through the Arduino library manager by searching 'SparkFun Alphanumeric Display' or you can get the GitHub repo as a .zip file and install the library from there.The SparkFun Qwiic Connect System is an ecosystem of I2C sensors， actuators， shields and cables that make prototyping faster and less prone to error. All Qwiic-enabled boards use a common 1mm pitch， 4-pin JST connector. This reduces the amount of required PCB space， and polarized connections mean you can't hook it up wrong.Get Started with the Qwiic Alphanumeric Display Hookup GuideFeaturesOperating Voltage：3.3VIntegrated RC oscillatorMaximum display segment numbers：128 patterns13×3 matrix key scan circuit16-step dimming circuitI2C Addresses：0x70(0x71， 0x72， 0x73)2x Qwiic connectors2x Wall Mounting Points

DescriptionProduct Restrictions：To access certain features of the ATECC608A， users will need to contact Microchip and sign an NDA contract to obtain the complete datasheet. Due to the required NDA - technical support， an Arduino library， and hookup guide are not provided for users on this product.The SparkFun ATECC608A Cryptographic Co-processor Breakout allows you to add strong security to your IoT node， edge device， or embedded system. This includesasymmetricauthentication，symmetricAES-128 encryption/decryption， and much more. As stated above， the ATECC608A has limited Arduino support and the complete datasheet is under NDA with Microchip.This breakout board includes two Qwiic ports for plug and play functionality. Utilizing our handy Qwiic system， no soldering is required to connect it to the rest of your system. However， we still have broken out 0.1"-spaced pins in case you prefer to use a breadboard. The ATECC608A chip is capable of many cryptographic processes， including， but not limited to：Creating and securely storing unique asymmetric key pairs based on Elliptic Curve Cryptography(FIPS186-3).AES-128：Encrypt/Decrypt， Galois Field Multiply for GCMCreating and verifying 64-byte digital signatures(from 32-bytes of message data).Creating a shared secret key on a public channel via Elliptic Curve Diffie-Hellman Algorithm.SHA-256 HMAC Hash including off-chip context save/restoreInternal high quality FIPS random number generator.Embedded in the chip is a 10Kb EEPROM array that can be used for storing keys， certificates， data， consumption logging， and security configurations. Access to the sections of memory can then be restricted and the configuration locked to prevent changes. Each ATECC608A Breakout ships with a guaranteed unique 72-bit serial number and includes several security features to prevent physical attacks on the device itself， or logical attacks on the data transmitted between the device.A summary datasheet for the ATECC608A is available here. The full datasheet is under NDA with Microchip. You will need to contact them for access to the entire datasheet. Meanwhile， the ArduinoATECCX08 Library currently only supports the ATECC608A with SAMD21 Arduino boards.We do have much more support for the ATECC508A version of this chip. Please check out our ATECC508A Hookup Guide and Arduino Library(which includes six examples). This will get you familiar with the basics of elliptic curve cryptography and signing/verifying data with the ATECC508A version of the chip.Note：The I2C address of the ATECC608A is 0x60 and is software-configurable to any address. A multiplexer/Mux is required to communicate to multiple ATECC608A sensors at the default address when on a single bus. If you need to use more than one ATECC608A sensor at the default address， consider using the Qwiic Mux Breakout.Note：The ATECC608A can be only configured once before it isPERMANENTLYlocked. It is advisable that users purchase multiple boards in order to use other configurations and explore the advanced functions of the ATECC608A.Additionally， this boardIScapable of encrypting and decrypting data. However， to access these additional features， you will need to contact Microchip and sign an NDA contract to obtain the complete datasheet.It is recommended that an SparkFun RedBoard Turbo - SAMD21 Development Board is used with this product due to the buffer size required on the I2C bus.The SparkFun Qwiic Connect System is an ecosystem of I2C sensors， actuators， shields and cables that make prototyping faster and less prone to error. All Qwiic-enabled boards use a common 1mm pitch， 4-pin JST connector. This reduces the amount of required PCB space， and polarized connections mean you can't hook it up wrong.FeaturesOperating Voltage：2.0V-5.5V(Default on Qwiic System：3.3V)Active Current Draw(for ATECC608A)：16 mASleep Current(for ATECC608A)：<150 nAGuaranteed Unique 72-bit Serial Number10 Kb EEPROM Memory for Keys， Certificates， and DataStorage for up to 16 Keys256-bit Key LengthInternal High-Quality FIPS Random Number Generator(RNG)Configurable I2C Address(7-bit)：0x60(Default)

DescriptionThe SparkFun Alphanumeric Display Arduino library makes printing strings to the display as easy as calling the print()function. With this library， you'll be able to send I2C commands to the VK16K33 LED driver chip to light up segments(including the decimal point or colon)and even scroll your string across the display. You can download the library through the Arduino library manager by searching 'SparkFun Alphanumeric Display' or you can get the GitHub repo as a .zip file and install the library from there.The SparkFun Qwiic Connect System is an ecosystem of I2C sensors， actuators， shields and cables that make prototyping faster and less prone to error. All Qwiic-enabled boards use a common 1mm pitch， 4-pin JST connector. This reduces the amount of required PCB space， and polarized connections mean you can't hook it up wrong.Get Started with the Qwiic Alphanumeric Display Hookup GuideFeaturesOperating Voltage：3.3VIntegrated RC oscillatorMaximum display segment numbers：128 patterns13×3 matrix key scan circuit16-step dimming circuitI2C Addresses：0x70(0x71， 0x72， 0x73)2x Qwiic connectors2x Wall Mounting Points

DescriptionThe SparkFun Alphanumeric Display Arduino library makes printing strings to the display as easy as calling the print()function. With this library， you'll be able to send I2C commands to the VK16K33 LED driver chip to light up segments(including the decimal point or colon)and even scroll your string across the display. You can download the library through the Arduino library manager by searching 'SparkFun Alphanumeric Display' or you can get the GitHub repo as a .zip file and install the library from there.The SparkFun Qwiic Connect System is an ecosystem of I2C sensors， actuators， shields and cables that make prototyping faster and less prone to error. All Qwiic-enabled boards use a common 1mm pitch， 4-pin JST connector. This reduces the amount of required PCB space， and polarized connections mean you can't hook it up wrong.Get Started with the Qwiic Alphanumeric Display Hookup GuideFeaturesOperating Voltage：3.3VIntegrated RC oscillatorMaximum display segment numbers：128 patterns13×3 matrix key scan circuit16-step dimming circuitI2C Addresses：0x70(0x71， 0x72， 0x73)2x Qwiic connectors2x Wall Mounting Points

DescriptionThe Raspberry Pi 4 Hardware Starter Kit provides a solid set of parts and instruction for working with the Raspberry Pi 4 in a more hardware-centric manner. While the Raspberry Pi isn't typically considered a go-to for hardware projects， its I/O pins hold a lot of benefits that you can use for a variety of applications. This kit covers the basics like using LEDs， and Buttons while providing a solid set of parts for working with any other hardware I/O and the 40-pin header. In addition， we've included all the parts needed for getting the Raspberry Pi 4 up and running whether it's on its own， or using a monitor(not included). The new 64GB MicroSD cards keep read/write commands running super fast， too.Most of the contents of the kit rely on the use of the 2x20， 40-pin header， so we've included a special extender to allow you to plug in the ribbon cable while using the provided heatsink case. We've also included a Qwiic Shim for easily working with I2C based Qwiic boards with the Pi. No soldering is required for this kit!Note：This variation includes the 4GB RAM option for the Raspberry Pi 4.Get Started with the Raspberry Pi 4 Model B Guide

DescriptionThe Compute Module 3+ Development Kit is made for developing industrial applications with CM3+， CM3+/Lite， CM3， CM3 Lite， and CM1.The Development Kit contains the critical hardware that allows you to design the Compute Module into a custom system， and gives you the freedom to add extra components and place parts exactly where your product needs them.The kit includes the Compute Module IO(CMIO)board， which is a simple， open-source breakout board into which you can plug a Compute Module. The board hosts 120 GPIO pins， an HDMI port， a USB port， two camera ports， and two display ports.Note：A separate power supply， such as this Universal Power Supply， is required to power the product(not included in the kit).

DescriptionThis is a small 12mm round speaker that operates around the audible 2kHz range. You can use these speakers to create simple music or user interfaces.This is not a true piezoelectric speaker but behaves similarly. Instead of a piezoelectric crystal that vibrates with an electric current， this tiny speaker uses an electromagnet to drive a thin metal sheet. That means you need to use some form of alternating current to get sound. The good news is that this speaker is tuned to respond best with a square wave(e.g. from a microcontroller).

DescriptionThis tri-band GNSS antenna is ideal for GPS L1， GLONASS L1， and Beidou B2 reception. At 45x45mm it is alargeceramic antenna with an incredible 38dB LNA gain.This antenna works well with the GPS-RTK providing reception of Beidou satellites where other more basic GPS antennas cannot. We've chosen to have the antenna manufactured without an enclosure to decrease the weight(45g including cable)making this antenna more ideal for rover and quad-copter applications. Additionally， the cable length has been reduced to 1m to reduce weight and to make a more clean installation.We recommend this antenna for RTK use when combined with the ground plate. This antenna is ideal for advanced raw， RTK， and post-processed measurements of GPS， GLONASS， and Beidou constellations. If all you need is GPS and GLONASS(basic GNSS)consider our lower cost magnetic mount GNSS antenna.Antenna is terminated with a standard SMA connector. Check out the related items below for any conversion cables you may need.FeaturesDimensions：45x45x9mmWeight：45g including 1m cableFrequency Range：1558 - 1615MHzLNA Voltage：3.3 to 15VDCPrimary Antenna Gain：4dBLNA Gain：38dBLNA Current：<= 35mATermination Connector：SMAImpedance：50ΩRight hand polarizationCable Length：1 meter

DescriptionThe SparkFun Alphanumeric Display Arduino library makes printing strings to the display as easy as calling the print()function. With this library， you'll be able to send I2C commands to the VK16K33 LED driver chip to light up segments(including the decimal point or colon)and even scroll your string across the display. You can download the library through the Arduino library manager by searching 'SparkFun Alphanumeric Display' or you can get the GitHub repo as a .zip file and install the library from there.The SparkFun Qwiic Connect System is an ecosystem of I2C sensors， actuators， shields and cables that make prototyping faster and less prone to error. All Qwiic-enabled boards use a common 1mm pitch， 4-pin JST connector. This reduces the amount of required PCB space， and polarized connections mean you can't hook it up wrong.Get Started with the Qwiic Alphanumeric Display Hookup GuideFeaturesOperating Voltage：3.3VIntegrated RC oscillatorMaximum display segment numbers：128 patterns13×3 matrix key scan circuit16-step dimming circuitI2C Addresses：0x70(0x71， 0x72， 0x73)2x Qwiic connectors2x Wall Mounting Points

DescriptionThe Raspberry Pi Compute Module 3+ Lite contains the guts of a Raspberry Pi 3 Model B+(the BCM2837 processor and 1GB LPDDR2 RAM). This module allows a designer to leverage the Raspberry Pi hardware and software stack in their own custom systems and form factors. In addition this module has extra IO interfaces over and above what is available on the Raspberry Pi model A/B boards， opening up more options for the designer.This is all integrated onto a small(67.6mm×31mm)board that fits into a standard DDR2 SODIMM connector. You get the full flexibility of the BCM2837 SoC(which means that many more GPIOs and interfaces are available than with a standard Raspberry Pi)， and designing the Module into a custom system should be relatively straightforward because all the tricky bits have been put onto the Module itself.The CM3+ Lite product is the same as CM3+ except the eMMC Flash is not fitted， and the SD/eMMC interface pins are available for the user to connect their own SD/eMMC device. Note that the CM3+ is electrically identical and， with the exception of higher CPU z-height， physically identical to the legacy CM3 products.Note：The CM3+ modules require a software/firmware image dated November 2018 or newer to function correctly.FeaturesBroadcom BCM2837B0， Cortex-A53(ARMv8)64-bit SoC @ 1.2GHz1GB LPDDR2 SDRAMOperating Supply Voltage：1.8V， 3.3VMinimum Operating Temperature：-25CMaximum Operating Temperature：+80CHDMI， MIPI， USB， and GPIO interfaces on edge connector

DescriptionThe MQ-137 is an Ammonia(NH3)gas sensor from Winsen. The sensing element is SnO2， which has lower conductivity in clean air. When NH3(Ammonia)gas exists， the sensor's conductivity gets higher along with the gas concentration rising. A simpl

DescriptionThe SparkFun Load Cell Amplifier is a small breakout board for the HX711 IC that allows you to easily read load cells to measure weight. By connecting the amplifier to your microcontroller you will be able to read the changes in the resistance of the load cell， and with some calibration you'll be able to get very accurate weight measurements. This can be handy for creating your own industrial scale， process control or simple presence detection.This version of the SparkFun Load Cell Amplifier features a few changes that you specifically asked for! We have separated the analog and digital supply， as well as added a 3.3uH inductor and a 0.1uF filter capacitor for digital supply. Need even more? Checkout the SparkFun Qwiic Scale. It has all the features of the HX711 but with additional library support， a true I2C interface， and no soldering required!The HX711 uses a two-wire interface(Clock and Data)for communication. Any microcontroller's GPIO pins should work， and numerous libraries have been written， making it easy to read data from the HX711. Check the hookup guide below for more information.Load cells use a four-wire Wheatstone bridge configuration to connect to the HX711. These are commonly colored RED， BLK， WHT， GRN and YLW. Each color corresponds to the conventional color coding of load cells：Red(Excitation+ or VCC)Black(Excitation- or GND)White(Amplifier-， Signal- or Output-)Green(A+， S+ or O+)Yellow(Shield)The YLW pin acts as an optional input that is not hooked up to the strain gauge but is utilized to ground and shield against outside EMI(electromagnetic interference). Please keep in mind that some load cells might have slight variations in color coding.Note：Special thanks to Bodge for supplying the Library for the HX711!Get Started with the HX711 Load Cell Amplifier GuideFeaturesOperation Voltage：2.7V--5VOperation Current：< 1.5mASelectable 10SPS or 80SPS output data rateSimultaneous 50 and 60Hz supply rejection