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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 TFMini Plus is a ToF(Time of Flight)LiDAR sensor capable of measuring the distance to an object as close as 10 centimeters(+/- 5cm up to 6m)and as far as 12 meters(+/-1% starting at 6m)! As with all LiDAR sensors， your effective detection distance will vary depending on lighting conditions and the reflectivity of your target object， but what makes this sensor special is its size. Measuring only 35x18.5x21mm， the TFMini Plus allows you to integrate LiDAR into applications traditionally reserved for smaller sensors.Setting itself apart from the original TFmini， the TFmini Plus has been designed with an IP65 enclosure meaning its "Dust tight water resistant"， and also passed the vibration test of drone level， which will greatly expand its application range. The TFMini Plus is easy to power at only 5V and easy to talk to using the UART communication protocol.Important：This product does not use laser light for ranging. Instead it contains an LED and optics. Many such systems are being marketed under the name "LiDAR，" although it may be more appropriate to think of this device as a "Time-of-Flight Infrared Rangefinder". It differs significantly from traditional IR rangefinders in that it uses ToF to determine range and not triangulation ― as is performed by the Sharp GP-series devices.FeaturesOperating Range - 0.1m～12m1Accuracy - ±5cm@(0.1-6m)， ±1%@(6m-12m)Distance resolution - 5mmFrame rate - 1-1000Hz(adjustable)Ambient light immunity - 70kluxOperating temperature - -20℃～60℃Enclosure rating - IP65Light source - LEDCentral wavelength - 850nmFOV - 3.6°Supply voltage - 5V±0.5VAverage current - ≦110mAPower consumption - 550mWPeak current - 500mACommunication level - LVTTL(3.3V)Material of enclosure - ABS+PCStorage temperature - -20℃～75℃Weight - 11gWire length - 30cm

DescriptionThe TFMini-S Micro LiDAR Module is a ToF(Time of Flight)LiDAR sensor capable of measuring the distance to an object as close as 10 centimeters(+/- 6cm up to 6m)and as far as 12 meters(+/-1% starting at 6m)! As with all LiDAR sensors， your effective detection distance will vary depending on lighting conditions and the reflectivity of your target object， but what makes this sensor special is its size. Measuring only 42x15x16mm， the TFMini-S allows you to integrate LiDAR into applications traditionally reserved for smaller sensors.TFMini-S is a single-point ranging LiDAR based on TFmini upgrade. The blind zone is shortened to 10cm， the outdoor performance and accuracy of different reflectivity are improved， it can achieve stable， accuracy， sensitive and high frequency range detection.Important：This product does not use laser light for ranging. Instead it contains an LED and optics. Many such systems are being marketed under the name "LiDAR，" although it may be more appropriate to think of this device as a "Time-of-Flight Infrared Rangefinder". It differs significantly from traditional IR rangefinders in that it uses ToF to determine range and not triangulation ― as is performed by the Sharp GP-series devices.FeaturesOperating Range：0.1m～12m@90%Reflectivity0.1～7m@10% Reflectivity0.1m～12m@90%Reflectivity(70Klux)0.1～7m@10% Reflectivity(70Klux)Accuracy：±6cm@(0.1-6m)±1%@(6m-12m)Distance Resolution：1cmFrame Rate：100HzAmbient light immunity：70KluxOperating Temperature：0℃～60℃Light source：VCSELCentral wavelength：850nmPhotobiological safety：Class1(EN60825)FOV：2°2Supply voltage：5V±0.1VAverage current：≦140mAPower consumption：≦0.7WPeak current：200mACommunication level：LVTTL(3.3V)Communication interface：UART / I2CDimension：42mmx15mmx16mm(LxWxH)Housing：PC/ABSStorage temperature：-20℃～75℃Weight：5g±0.3gCable length：10cm

DescriptionThe 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 BoardFeaturesInput voltage range2.5V to 6.0VTyp.5Vvia Main Board's USB connectorTyp.～3.7V to 4.2Vvia Main Board's LiPo battery ConnectorI/O voltage3.3VAP2112 3.3V voltage regulator(rated 600mA)Power LEDI2C pull-up resistorsSensirion SGP40 Air Quality SensorUses I2C interfaceAddress：0x59(default)Operating voltage range1.7V to 3.6V(Typ.3.3V)Operating temperature range-20℃ to +55℃Typical current consumption2.6mAduring continuous operation(at 3.3V)34μAwhen idle(heater off)Output signalDigital raw value(SRAW)：0 - 65535 ticksDigital processed value(VOC Index)：0 - 500 VOC index pointsSwitch-on behaviorTime until reliably detecting VOC events：<60sTime until specifications are met：<1hRecommended sampling intervalVOC Index：1sSRAW：0.5s - 10s(Typ. 1s)Sensirion SHTC3 Humidity and Temperature SensorUses I2C interfaceAddress：0x70(default， non-configurable)Operating voltage range1.62V - 3.6V(Typ.3.3V)Operating temperature range-40℃ to +125 ℃Relative HumidityMeasurement range：0% to 100%Typical accuracy：±2 %RHResolution：0.01 %RHTemperatureMeasurement 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 temperatureSensirion STC31 CO2 SensorUses I2C interfaceAddresses：0x29(default)， 0x2A， 0x2B， 0x2COperating voltage range2.7V to 5.5V(Typ.3.3V)Operating temperature range-20 ℃ to +85 ℃Calibrated for CO2 in N2 and CO2 in airMeasurement ranges0 to 25 vol% in N20 to 100 vol% in airAccuracy0.5 vol% + 3% measured value in N21 vol% + 3% measured value in airConcentration and temperature resolution：16-bitRepeatability：0.2 vol%Temperature stability：0.025 vol% / ℃Start-up time：14 msThermal conductivity sensor provides calibrated gas concentration and temperature outputJumpersPWR LEDI2C pull-up resistorsSTC31 address selectionNote：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.

DescriptionThe SparkFun RTK Surveyor is an easy to use GNSS receiver for centimeter-level positioning. Perfect for surveying， this preprogrammed device can also be used for autonomous driving， navigation， asset tracking and any other application where there is a clear view of the sky. The RTK Surveyor can also be used as a base station. With the flick of a switch， two RTK Surveyors can be used to create an RTK system capable of 14mm horizontal positional accuracy. The built-in Bluetooth(R)connection via an ESP32 WROOM enables the user to use the RTK Surveyor with their choice of GIS application on a phone or tablet. The built in battery allows field use for up to four hours and is compatible with common USB battery banks.This device can be used in four modes：GNSS Positioning(～30cm accuracy)GNSS Positioning with RTK(1.4cm accuracy)GNSS Base StationGNSS Base Station NTRIP ServerIn Position mode the device receives L1/L2 signals from a user-provided antenna and the high-grade GNSS receiver provides lat/long and altitude with accuracies around 300mm.In Positioning with RTK mode the device receives L1/L2 signals from the antenna and correction data from a base station. The correction data can be obtained from a cellular link to online correction sources or over a radio link to a 2nd RTK Surveyor setup as a base station.In Base Station mode the device is mounted to a temporary position(like a tripod)and begins transmitting correction data over a radio or internet connection. A base is often used in conjunction with a second unit set to 'Positioning with RTK' to obtain the 14mm relative accuracy.In Base Station NTRIP Server mode the device is mounted to a semi or permanently fixed position(like a roof)and connects over WiFi to transmit the correction data to a NTRIP caster so that any rover can access the correction data over a cellular or internet connection. This type of base is a very easy way to setup a very precise absolute correction source.Two cables are provided with the RTK Surveyor allowing a user to plug on our easy to use Serial Telemetry Radios or their own radio link. If a local correction source is within 10km， a user can also use their phone to provide correction data over the Bluetooth(R)link(no external radio needed!).Note：The SparkFun RTK Surveyor is just the enclosed device and does NOT include an antenna， serial telemetry radio， or associated mounting pieces. These items will need to be purchased separately from the Hookup Accessories below.Get Started With the SparkFun RTK Surveyor GuideFeaturesGNSS Receiver：ZED-F9PConcurrent reception of GPS， GLONASS， Galileo and BeiDouReceives both L1C/A and L2C bandsCurrent：68mA - 130mA(varies with constellations and tracking state)Time to First Fix：25s(cold)， 2s(hot)Max Navigation Rate：PVT(basic location over UBX binary protocol)- 25HzRTK - 20HzRaw - 25HzHorizontal Position Accuracy：2.5m without RTK0.010m with RTKMax Altitude：50km(31 miles)Max Velocity：500m/s(1118mph)Bluetooth(R)Transceiver：ESP32 WROOMXtensa(R)dual-core 32-bit LX6 microprocessorUp to 240MHz clock frequency16MB of flash storage520kB internal SRAMIntegrated 802.11 BGN WiFi transceiverIntegrated dual-mode Bluetooth(R)(classic and BLE)Hardware accelerated encryption(AES， SHA2， ECC， RSA-4096)2.5 μA deep sleep currentOverall DeviceInternal Battery：LiPo 1000mAh with 500mA chargingRadio Port：3.3V TTL Serial(57600bps RTCM TX/RX)Data Port：3.3V TTL Serial(115200bps NMEA)Weight：132g(entire device including battery)Dimensions：118mm×79mm×30mm(4.7in×3.1in×1.2in)1x Qwiic Connector1x microSD Socket for optional loggingChanges：This version(which replaces SPX-17369)uses a reinforced edge mount SMA connector for better resiliency when a fixed 'stub' antenna is used.