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Description。This is the 16mm C-mount telephoto lens from CGL Electronics Co. Ltd. for use with the Raspberry Pi HQ Camera Module. The lens produces a 10MP picture in a 1in image format and is easily interchangeable using the thumb screw and adapter inc

Description。The SparkFun Soil Moisture Sensor is a simple breakout for measuring the moisture in soil and similar materials. The soil moisture sensor is pretty straightforward to use. The two large， exposed pads function as probes for the sensor， together acting as a variable resistor. The more water that is in the soil means the better the conductivity between the pads will be， resulting in a lower resistance and a higher SIG out. This version of the Soil Moisture Sensor includes a 3-pin screw pin terminal pre-soldered to the board for easy wiring and setup.。To get the SparkFun Soil Moisture Sensor functioning， all you will need is to connect the VCC and GND pins to your Arduino-based device(or compatible development board). You will receive a SIG out， which will depend on the amount of water in the soil. One commonly known issue with soil moisture senors is their short lifespan when exposed to a moist environment. To combat this， we've had the PCB coated in gold finishing(ENIG， or Electroless Nickel Immersion Gold).。Note：Check the Hookup Guide below for assembly and weatherproofing instructions， as well as a simple example project that you can put together yourself!。Get Started with the Soil Moisture Sensor Guide

Through-hole RJ11 socket with PCB mounting posts. 6-pin connection - housing accepts common telephone connectors/wiring.

Description。Although small in size， KW4-Z5F roller microswitches are rated for controlling electrical loads ranging from logic level(computer based circuits)to power duty switching(up to 16.1 A and 250 Vac). The package size of the subminiature switch

Description。With the cost of microSD cards on a consistent rise， it's always useful to have an economical and reliable option as a backup for storing your files. This sleek， red 16GB thumb drive has been emblazoned with our SparkFun Electronics logo a

Description。Welcome to the world of paper circuits - creating electronic projects directly on paper using simple components! The SparkFun Paper Circuits Kit teaches the basics and fundamentals of creating an electric circuit without the need to solde

Description。Jump-start your IoT development with the Omega2+ Starter Kit. This kit includes everything you need to create eight different circuits that will teach you how to control LEDs， read inputs， control and read external sensors and displays， learn Python， and more. Step-by-step instructions for building each circuit with the included parts can be found in the online Starter Kit Guide under the "Documents" tab.。Each Starter Kit includes an Onion Omega2+ IoT Computer， an Expansion Dock and a variety of electronics components that belong in the collection of every student of Internet of Things. This collection includes resistors， LEDs， jumper wires， switches， a 7-segment display and an LCD screen， to name a few. All kit components are nicely packed up in a handy plastic carrying case.。The Onion Omega parts we carry are separated into three different categories：Mainboard， Dock and Expansion Board. With the parts in this kit you will be able to plug the Omega2+ into the Expansion Dock and add any Expansion Board! For a kit that includes all of the parts in the Starter Kit plus the Expansion Boards， check out the Omega2+ Maker Kit.。Examples。Blinking an LED --- Learn the basics of programming the Omega by turning an LED on and off.。Blinking Multiple LEDs --- Learn some more programming concepts by controlling multiple LEDs at once.。Fading an LED --- Create a cool LED fading effect using the Pulse Width Modulation(PWM)technique.。Reading a Switch --- Use a physical switch to control an LED through the Omega.。Using a Shift Register --- Use a shift register chip to control eight LEDs using only a few GPIOs.。Controlling a 7-Segment Display --- Add a 7-segment display to the previous circuit to display numbers.。Reading a 1-Wire Temperature Sensor --- Use a 1-wire temperature sensor to read the ambient temperature.。Controlling an LCD Screen --- Use the I2C protocol to control an LCD screen attached to the previous circuit.

Description。The Elektor MIT App Inventor Bundle is a kit built to help learn about developing apps for Android compatible mobile devices using the MIT App Inventor online development environment. MIT App Inventor projects can be in either standalone mode or use an external processor. In standalone mode， the developed application runs only on the mobile device(e.g. Android). In external processor-based applications， the mobile device communicates with an external microcontroller-based processor， such as Raspberry Pi， Arduino， ESP8266， ESP32， etc.。The kit comes with a book and a selection of parts that correspond with a number of projects. Check out the features and Includes tab for more information.。Features。Projects Include：Using the text-to-speech component。Intonating a received SMS message。Sending SMS messages。Making telephone calls using a contacts list。Using the GPS and Pin-pointing our location on a map。Speech recognition and speech translation to another language。Controlling multiple relays by speech commands。Projects for the Raspberry Pi， ESP32 and Arduino using Bluetooth and Wi-Fi。MIT APP Inventor and Node-RED projects for the Raspberry Pi

。Description。This is the SparkFun RJ11 Breakout， two simple breakout boards for the common 6-pin RJ11 connector. These little boards can easily have one of our RJ11 6-Pin Connectors to work with common telephone cables. Each board features standard B/R/Y/G(Black/Red/Yellow/Green)labels on the top of the board to match a standard telephone wire. Additionally， each board has pin numbers on the back side that match with the pins on the connector.。Each breakout consists of two boards -- one for each end of the connections -- as well as mounting holes to help you secure your project in place.

Description。The Logitech K400 Plus Wireless Touch Keyboard is a compact keyboard with an integrated touchpad that puts all your controls in a single device. Enjoy your entertainment without the clutter of multiple devices. Comfortable， quiet keys and a

Description。Your 5V system can wield great power with this big， beefy relay board. How does 10A on the NC contacts and 20A on the NO contacts at 220VAC sound? The SparkFun Beefcake Relay Control Kit contains all the parts you need to get your high-power load under control. Only minimal assembly is required!。The heart of the board is sealed， SPDT 20A/10A Relay. The relay is controlled by 5V logic through transistor， and an LED tells you when the relay is closed. This is kit， so it comes as through-hole parts with assembly required， which makes for some nice soldering practice. Screw terminal connectors on either side of the board make it easy to incorporate into your project.。There are some pretty beefy traces connecting the relay to the load pins， but the 3-pin terminals are only rated for 15A max! If you plan on connecting larger load， you'll need to solder directly to the board. As always with high current and voltage， play it safe and use your judgment when deciding how much of load you want to put on board -- in open airflow the PCB can handle the full 20A for few minutes at time， but in an enclosed area heat can build up.。Note：Please keep in mind that this board is really meant for someone with experience and good knowledge of electricity. If you're uncomfortable soldering or dealing with high voltage， please check out the IoT Power Relay. The IoT Power Relay is fully enclosed， making it lot safer.。Get Started With the Beefcake Hookup Assembly Guide。Features。Voltage Rating：220VAC/28VDC。VCC requirements：4-6V， 150mA capable。SPDT pins exposed(Form C)。14 AWG screw terminals for relay connections.。10 AWG solder lugs for relay connections.。Flyback diode included。Zener recovery diode included(decreases turn-off time)。Heavy oz. copper on PCB

Description。The XBee3 Thing Plus is an ultra capable and easy way for getting into wireless device development. The combination of XBee and Qwiic in a space conscious design represents a much needed update to our XBee offering. With 20 I/O pins and Lithium Polymer Ion battery management， the XBee3 Thing Plus has all the basics for quickly prototyping or developing a connected device such as a remote sensor. The Qwiic connector and JST connector for the battery make for a solder-less option when working with the board which shortens setup time.。The new XBee3 Micro Module provides the classic all-but plug and play 802.15.4 2.4GHz wireless connection(Zigbee 3.0 Protocol)that makes it so desirable， but with a new addition of being programmable with MicroPython(32KB of memory available for it). RF data rates up to 250 Kbps and 200ft indoor ranges and up to 4000ft line-of-sight outdoor range. Communicating with/Configuring the module happens via an AT Command set or the Digi API， X-CTU， both locally or over-the-air. There's even a mobile version of X-CTU now； Digi XBee(R)Mobile.。This variation features a U.FL antenna connector for longer range communications. Check out the related products for compatible antennas.。Get Started With the SparkFun XBee3 Thing Plus Guide。Features。XBee3 Micro Module。Silicon Labs EFR32MG SoC。250Kbps RF， 1Mbps Serial data rates。Indoor/Urban range up to 200 ft(60 m)。Outdoor/RF Line of Sight range up to 4000 ft(1200 m)。+8 dBm transmit power。-103 dBm receiver sensitivity。UART， I2C， SPI Interfaces(SPI currently not available at this time， but broken out on the board)。ISM 2.4GHz Frequency Band(802.15.4)。1MB of memory， 128KB RAM(32KB available for MicroPython)。20 GPIO Pins。Configurable via X-CTU or AT Command set via both USB and Wirelessly(second XBee 3 device required for wireless configuration unless you're using the mobile app)。Qwiic Compatible。On-board charging circuit and connector for 3.3v Lithium Polymer Ion Batteries(see related products for compatible batteries)。2.6VDC - 3.6VDC supply voltage。U.FL Antenna Connector

Here is a very simple breadboard power supply kit that takes power from a DC wall wart and outputs a selectable 5V or 3.3V regulated voltage. The .1" headers are mounted on the bottom of the PCB for simple insertion into a breadboard. Pins labeled VCC and GND plug directly into the power lines. The lone pair of pins have no electrical connection but help support the PCB.。There are two pins available within the barrel jack footprint. Any stripped +/- DC supply can be connected instead of the barrel connector. Board has both an On/Off switch and a voltage select switch(3.3V/5V).。Comes as a bag of parts kit and is easily assembled if you can follow the silkscreen indicators and have beginning experience with a soldering iron. You will need to read the resistor bands or use a multimeter to determine the resistor sizes.。Dimensions：1.25x1.25"。Kit Includes：DC Barrel Connector(2.1mm center positive)。TO-220 Voltage Regulator(LM317 1.5A max current)。1N4004 Reverse Protection Diode。100uF 25V Capacitor。10uF 25V Capacitor。0.1uF 50V Capacitor。Red Power LED - High Brightness。2×SPDT Slide Switch。4×0.1" Header Pins。2×330 Resistor 1/6W。390 Resistor 1/6W。240 Resistor 1/6W。Bare PCB with Silkscreen Indicators。PTC resettable fuse

Description。With Single-Board Computers(SBCs)on the rise， it is a good idea to have an easy way to interface with them. Operating on a 2.4GHz frequency， the Multimedia Wireless Keyboard possesses a normal-sized key layout， media controls and a multitouch track pad. This keyboard is powered by a built-in 850mAh LiPo battery， providing you with 500--700 hours of use. Even if you don't have a Raspberry Pi， BeagleBone or another SBC， this keyboard can work with smart TVs， mobile devices and full-blown PCs!。The Multimedia Wireless Keyboard can be charged via the attached USB cable， which stores in the same compartment as the wireless USB receiver. The track pad on the wireless keyboard not only features left and right click options， but also a scroll function. Measuring less than an inch thick， this wireless keyboard is an ideal product for on-the-go situations.。Note：The attached USB cable is for charging purposes only.。Features。317.2mm×123.6mm×18.3mm(12.4in×4.8in×0.7in)。System Requirements：HID-Compatible Device。USB Port。Windows 2000， XP， CE， Vista， 7， 8 or Higher。Linux(Debian-3.1， Red Hat-9.0， Ubuntu-8.10， Fedora-7.0)。Android OS

Description。The SparkFun Multiplexer Breakout provides access to all pins and features of the 74HC4051， an 8-channel analog multiplexer/demultiplexer. The 74HC4051 allows you to turn four I/O pins into eight multifunctional， individually selectable signals， which can be used to do everything from driving eight LEDs to monitoring eight potentiometers.。The 74HC4051 can function as either a multiplexer or a demultiplexer， and it features eight channels of selectable inputs/outputs. The routing of common signal to independent I/O is set by digitally controlling three select lines， which can be set either high or low into one of eight binary combinations.。One half of the board breaks out the control signals(E， S0-S2)and common input/output(Z). The other side provides access to all eight independent I/O's(Y0-Y7). Both sides include supply and ground connections(VCC， VEE， GND).。Get Started with the 74HC4051 Breakout Guide。Features。Switches analog or digital signals。8 channels controlled by 3 select inputs。Wide voltage supply range：2 -- 10V。Bipolar supply support(e.g.， ±5V)。Optional enable input。Breadboard compatible breakout

Description。The XBee3 Thing Plus is an ultra-capable and easy way for getting into wireless device development. The combination of XBee and Qwiic in a space-conscious design represents a much-needed update to our XBee offering. With 20 I/O pins and Lithium-Polymer Ion battery management， the XBee3 Thing Plus has all the basics for quickly prototyping or developing a connected device such as a remote sensor. The Qwiic connector and JST connector for the battery make for a solder-less option when working with the board which shortens setup time.。The new XBee3 Micro Module provides the classic， near plug and play 802.15.4 2.4GHz wireless connection(Zigbee 3.0 Protocol)that makes it so desirable， but with a new addition of being programmable with MicroPython(32KB of memory available for it). RF data rates up to 250Kbps and 200 ft indoor ranges and up to 4000 ft line-of-sight outdoor range. Communicating with/Configuring the module happens via an AT Command set or the Digi API， X-CTU， both locally or over-the-air. There's even a mobile version of X-CTU now； Digi XBee(R)Mobile.。Note：This variation uses a chip antenna and is not compatible with external antennas.。Get Started With the SparkFun XBee3 Thing Plus Guide。Features。XBee3 Micro Module。Silicon Labs EFR32MG SoC。250Kbps RF， 1Mbps Serial data rates。Indoor/Urban range up to 200 ft(60 m)。Outdoor/RF Line of Sight range up to 4000 ft(1200 m)。+8 dBm transmit power。-103 dBm receiver sensitivity。UART， I2C， SPI Interfaces(SPI currently not available at this time， but broken out on the board)。ISM 2.4GHz Frequency Band(802.15.4)。1MB of memory， 128KB RAM(32KB available for MicroPython)。20 GPIO Pins。Configurable via X-CTU or AT Command set via both USB and Wirelessly(second XBee 3 device required for wireless configuration unless you're using the mobile app)。Qwiic Compatible。On-board charging circuit and connector for 3.3v Lithium Polymer Ion Batteries(see related products for compatible batteries)。2.6VDC - 3.6VDC supply voltage。On-board Chip Antenna

Description。The SparkFun Qwiic HAT for Raspberry Pi is the quickest and easiest way to enter into SparkFun's Qwiic ecosystem while still using that Raspberry Pi that you've come to know and love. The Qwiic HAT connects the I2C bus(GND， 3.3V， SDA and SCL)on your Raspberry Pi to an array of Qwiic connectors on the HAT. Since the Qwiic system allows for daisy chaining boards with different addresses， you can stack as many sensors as you'd like to create a tower of sensing power!。The Qwiic Pi HAT has four Qwiic connect ports， all on the same I2C bus. In addition， many of the useful GPIO pins on the Raspberry Pi are broken out. This HAT is compatible with any Raspberry Pi that utilizes the standard 2x20 GPIO header. It has been designed to sit to the side of the Pi， allowing it to work conveniently with a Pi Tin enclosure to connect boards to the Qwiic ports.。Note：。There is a small silk error that has reversed the SDA and SCL. This is simply a cosmetic mix-up and will not impact any function with this board.。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 SparkFun Qwiic Pi HAT Guide。Features。4x Qwiic Connection Ports。Select GPIO Pins Broken Out。Pi Tin Compatibility

。Description。The MAX31820 ambient temperature sensor provides 9-bit to 12-bit Celsius temperature measurements with ±0.5℃ accuracy over a +10℃ to +45℃ temperature range. Over its entire -55℃ to +125℃ operating range， the device has ±2.0℃ accuracy.。The device communicates over a one-wire bus that， by definition， requires only one data line(and ground)for communication with a central microprocessor. In addition， the device can derive power directly from the data line， eliminating the need for an external power supply. Requiring so few pins enables the device to be placed in a 3-pin TO-92 package. The form factor of this package allows the device to be placed above the board and thus measure the ambient temperature of a system， as opposed to the board temperature that a surface-mount package would measure.。Each MAX31820 has a unique 64-bit serial code， which allows multiple MAX31820 devices to function on the same one-wire bus. Therefore， it is simple to use one microprocessor to control many devices distributed over a large area.。Features。Unique one-wire interface requires only one port pin for communication。Each device has a unique 64-bit serial code stored in onboard ROM。Multidrop capability simplifies distributed temperature-sensing applications。Requires no external components。Can be powered from data line； 3.0V to 3.7V power-supply range。Measures temperatures from -55℃ to +125℃。±0.5℃ accuracy from +10℃ to +45℃。Thermometer resolution is user-selectable from 9 bits to 12 bits。Converts temperature to 12-bit digital word in 750ms(Max)。User-definable nonvolatile(NV)alarm settings。Alarm search command identifies and addresses devices whose temperature is outside programmed limits(Temperature Alarm Condition)。Available in 3-pin TO-92 package。TO-92 package allows measurement of ambient temperature。Software compatible with the DS1822 and DS18B20

Description。Are you low on I/O? No problem! The SX1509 Breakout is 16-channel GPIO expander with an I2C interface that means with just two wires， your microcontroller can interface with 16 fully configurable digital input/output pins. But the SX1509 can do so much more than just simple digital pin control. It can produce PWM signals， so you can dim LEDs. It can be set to blink or even breathe pins at varying rates. This breakout is similar to multiplexer or "mux，" in that it allows you to get more IO from less pins. And， with built-in keypad engine， it can interface with up to 64 buttons set up in an 8x8 matrix.。Two headers at the top and bottom of the breakout board function as the input and control headers to the board. This is where you can supply power to the SX1509， and where your I2C signals SDA and SCL will terminate. GPIO and power buses are broken out in every-which direction， and configurable jumpers cover most of the rest of the board.。Since the I/O banks can operate between 1.2V and 3.6V(5.5V tolerant)independent of both the core and each other， this device can also work as level-shifter. The SX1509 breakout makes it easy to prototype so you can add more I/O onto your Arduino or I/O limited controller. We've even spun up an Arduino Library to get you started!。Features。Enable Direct Level Shifting Between I/O Banks and Host Controller。5.5V Tolerant I/Os， Up to 15mA Output Sink on All I/Os。Integrated LED Driver with Intensity Control。On-Chip Keypad Scanning Engine Supports Up to 8x8 Matrix(64 Keys)。16 Channels of True Bi-directional Style I/O。400kHz I2C Compatible Slave Interface

Description。The SparkFun Qwiic Dual Solid State Relay is a power delivery board that allows users to switch two AC loads from a low power microcontroller using the SparkFun Qwiic connect system. The board features two 25A/250VAC solid state relays that utilize the Zero Cross Trigger method so you can toggle two loads on a 60Hz AC carrier signal on and off up to 120 times per second!。An ATTiny84 acts as the "brain" of the SparkFun Qwiic Dual Solid Relay to accept I2C commands to toggle the two relays as well as a few other special commands. The I2C address of the ATtiny84A is software configurable so， if you have a seriously big power project in mind， you could daisy chain over 100 Qwiic Dual Solid State Relays.。Messing with such high voltage is dangerous! We've included many safety precautions onto the PCB including ground isolation between the relay and other circuitry and a milled out area isolating each side of AC. However， with all the safety precautions included with the SparkFun Qwiic Dual Solid State Relay， this is still a power accessory for users who are experienced around， and knowledgeable about high AC voltage. If you're not comfortable with handling AC voltage in this way， you may want to check out the IoT Power Relay instead.。Note：The relays are rated for a max of 25A with forced air cooling. If you do not have forced air cooling， 10A max through the relays is recommended.。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 SparkFun Qwiic Dual Solid State Relay Guide。Features。Operating Voltage：2.5-3.6V(3.3V recommended)。I2C Address：0x0A(Default)0x0B(Alternate via jumper select)。Load Voltage Range：12-280VAC。Max Current(Through Relay)：25A(240VAC with forced air cooling)。Zero Cross Trigger。Normally Open Circuit Only。2x Qwiic Connector

Description。The SparkFun MicroMod Environmental Function Board adds additional sensing options to the MicroMod Processor Boards. This Function Board includes three sensors to monitor air quality(SGP40)， humidity temperature(SHTC3)， and CO2 concentrations(STC31)in your indoor environment. To make it even easier to use， all communication is over the MicroMod's I2C bus!。The SGP40 measures the quality of the air in your room or house. The SGP40 uses a metal oxide(MOx)sensor with a temperature controlled micro hotplate and provides a humidity-compensated volatile organic compound(VOC)based indoor air quality signal. Both the sensing element and VOC Algorithm feature an unmatched robustness against contaminating gases present in real world applications enabling a unique long term stability as well as low drift and device to device variation.。The SHTC3 is a highly accurate digital humidity and temperature sensor. The SHTC3 uses a capacitive humidity sensor with a relative humidity measurement range of 0 to 100% RH and bandgap temperature sensor with a temperature measurement range of -40℃ to 125℃. The SHTC3 builds on the success of their SHTC1 sensor with higher accuracy(±2% RH， ±0.2℃)than its predecessor， enabling greater flexibility.。The STC31 measures CO2 concentrations based on thermal conductivity and has two CO2 measurement ranges：0 to 25 vol%； and 0 to 100 vol%. The measurement repeatability is 0.2 vol%， with a stability of 0.025 vol% / ℃. The measurement accuracy depends on the measurement range：0.5 vol% + 3% measured value； 1 vol% + 3% measured value. Using measurements from the SHTC3， the STC31 is able to provide humidity-compensated measurements together with improved temperature compensation. The STC31 can compensate for atmospheric pressure too - which is handy if， like us， you're up in the mountains!。The outstanding performance of these three sensors is based on Sensirion's patented CMOSens(R)technology， which combines the sensor element， signal processing， and digital calibration on a small CMOS chip. The well-proven CMOS technology is perfectly suited for high-quality mass production and is the ideal choice for demanding and cost-sensitive OEM applications.。Utilizing our handy M.2 MicroMod connector， no soldering is required to connect it to your system. Simply match up the key on your processor and function board's beveled edge connector to their respective key on the M.2 connector， then secure them to the main board with screws. The MicroMod Environmental Function Board can then be read via the I2C port. The board is equipped with the AP2112 3.3V voltage regulator， I2C pull-up resistors， power LED， jumper to disable the LED， and jumpers for alternative STC31 addresses.。Note：A MicroMod Processor and Main Board are not included with this MicroMod Environmental Function Board. These boards will need to be purchased separately.。MicroMod is a modular interface ecosystem that connects a microcontroller "processor board" to various "carrier board" peripherals. Utilizing the M.2 standard， the MicroMod standard is designed to easily swap out processors and function boards on the fly. Pair a specialized carrier board for the project you need with your choice of compatible processor!。Get Started with the MicroMod Environmental Function Board。Features。Input voltage range。2.5V to 6.0V。Typ.。5V。via Main Board's USB connector。Typ.。～3.7V to 4.2V。via Main Board's LiPo battery Connector。I/O voltage。3.3V。AP2112 3.3V voltage regulator(rated 600mA)。Power LED。I2C pull-up resistors。Sensirion SGP40 Air Quality Sensor。Uses I2C interface。Address：0x59(default)。Operating voltage range。1.7V to 3.6V(Typ.。3.3V。)。Operating temperature range。-20℃ to +55℃。Typical current consumption。2.6mA。during continuous operation(at 3.3V)。34μA。when idle(heater off)。Output signal。Digital raw value(SRAW)：0 - 65535 ticks。Digital processed value(VOC Index)：0 - 500 VOC index points。Switch-on behavior。Time until reliably detecting VOC events：<60s。Time until specifications are met：<1h。Recommended sampling interval。VOC Index：1s。SRAW：0.5s - 10s(Typ. 1s)。Sensirion SHTC3 Humidity and Temperature Sensor。Uses I2C interface。Address：0x70(default， non-configurable)。Operating voltage range。1.62V - 3.6V(Typ.。3.3V。)。Operating temperature range。-40℃ to +125 ℃。Relative Humidity。Measurement range：0% to 100%。Typical accuracy：±2 %RH。Resolution：0.01 %RH。Temperature。Measurement range：-40℃ to +125 ℃。Typical accuracy：±0.2 ℃。Resolution：0.01 ℃。Typical current consumption(varies based on mode)。4.9μA to 430μA(Normal Mode)。0.5μA to 270μA(Low Power Mode)。Allows the STC31 to compensate for humidity and temperature。Sensirion STC31 CO2 Sensor。Uses I2C interface。Addresses：0x29(default)。， 0x2A， 0x2B， 0x2C。Operating voltage range。2.7V to 5.5V(Typ.。3.3V。)。Operating temperature range。-20 ℃ to +85 ℃。Calibrated for CO2 in N2 and CO2 in air。Measurement ranges。0 to 25 vol% in N2。0 to 100 vol% in air。Accuracy。0.5 vol% + 3% measured value in N2。1 vol% + 3% measured value in air。Concentration and temperature resolution：16-bit。Repeatability：0.2 vol%。Temperature stability：0.025 vol% / ℃。Start-up time：14 ms。Thermal conductivity sensor provides calibrated gas concentration and temperature output。Jumpers。PWR LED。I2C pull-up resistors。STC31 address selection。Note：The I2C addresses that are reserved for each sensor is 0x59(SGP40)， 0x70(SHTC3)， 0x29(STC31). A multiplexer/Mux is required to communicate to multiple SHTC3 sensors on a single bus. The SHTC3 uses the same address as the Qwiic Mux(0x70). For advanced users that are using multiple SHTC3's with the Qwiic Mux， you will need to adjust the Qwiic Mux's default address.