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RFID Tag - ABS Token MIFARE Classic® 1K (13.56 MHz)
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Price: $6.03
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Sparkfun Item #: SEN-10127 -

This is a basic RFID tag that functions within the MIFARE Classic® 1K guidelines. You can use these for all sorts of identification and sensing applications. The tag also has 1K of data storage which can be read and written from a compatible device. Check the related products below. This tag has a diameter of 30mm with a 5mm hole in the center and an overall thickness of 2.25mm. It works with MIFARE® 13.56 MHz compatible readers. The MIFARE Classic® card is fundamentally just a memory storage...

RFID Tag - Adhesive MIFARE Classic® 1K (13.56 MHz)
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Price: $6.03
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Sparkfun Item #: SEN-11319 -

This is a basic RFID tag that functions within the MIFARE Classic® 1K guidelines. You can use these for all sorts of identification and sensing applications. The tag also has 1K of data storage which can be read and written from a compatible device. Check the related products below. This tag has an adhesive backing and a diameter of 30mm with an overall thickness of 0.4mm. It works with MIFARE® 13.56 MHz compatible readers. The MIFARE Classic® card is fundamentally just a memory storage...

RFID Tag - Laundry MIFARE Classic® 1K (13.56 MHz)
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Price: $8.04
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Sparkfun Item #: SEN-10131 -

This is a basic RFID tag that functions within the MIFARE Classic® 1K guidelines. You can use these for all sorts of identification and sensing applications. The tag also has 1K of data storage which can be read and written from a compatible device. Check the related products below. This tag has a diameter of 13mm and an overall thickness of about 2mm. They are also waterproof for use in laundry. It works with MIFARE® 13.56 MHz compatible readers. The MIFARE Classic® card is fundamentally just...

RFID Tag - Transparent MIFARE Classic® 1K (13.56 MHz)
Price: $5.96
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Sparkfun Item #: SEN-10128 -

This is a basic RFID tag that functions within the MIFARE Classic® 1K guidelines. You can use these for all sorts of identification and sensing applications. The tag also has 1K of data storage which can be read and written from a compatible device. Check the related products below. This tag is transparent and has a diameter of 25mm and an overall thickness of about 0.7mm. It works with MIFARE® 13.56 MHz compatible readers. The MIFARE Classic® card is fundamentally just a memory storage...

RPLIDAR A2M8 360° Laser Range Scanner
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Price: $793.49
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Sparkfun Item #: SEN-14756 -

The RPLIDAR A2 is a sleek, indoor, 360 degree 2D LIDAR. Each RPLIDAR A2 can take up to 8000 samples of laser ranging per second thanks to its high rotation speed. The on-board system can perform 2D 360° scans within a range of 12 meters (18m with a bit of firmware adjustment). Additionally, the generated 2D point cloud data can be used in mapping, localization and object/environment modeling! The RPLIDAR A2M8 consists of a range scanner core and mechanical powering parts which makes the core...

RPLIDAR A3M1 360° Laser Range Scanner
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Price: $1,501.29
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Sparkfun Item #: SEN-15045 -

The RPLIDAR A3M1 is the next generation of 360 degree 2D LIDARs. Each RPLIDAR A3 can take up to 16000 samples of laser ranging per second thanks to its high rotation speed. The on-board system can perform 2D 360° scans within a range of 25 meters in enhanced mode and 20 meters in outdoor mode. Additionally, the generated 2D point cloud data can be used in mapping, localization, and object/environment modeling! The RPLIDAR A3M1 consists of a long range scanner core and mechanical powering parts...

RPLIDAR S1 360° TOF Laser Range Scanner
Price: $1,394.05
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Sparkfun Item #: SEN-15872 -

The RPLIDAR S1 is the next generation low cost 360 degree 2D laser scanner (LIDAR) solution developed by SLAMTEC. It can take up to 9200 samples of laser ranging per second with high rotation speed. And equipped with SLAMTEC patented OPTMAG technology, it breakouts the life limitation of traditional LIDAR system so as to work stably for a long time. The system can perform 2D 360-degree scan within a 40-meter range. The generated 2D point cloud data can be used in mapping, localization and...

RS485 Sensor Node V1.0
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Price: $51.54
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DFRobot Item #: DFR0233 -

This RS-485 Sensor Node module can be used in various applications such as intelligent agriculture, environment monitoring, home automation...etc. It is a Internet of things device. This RS-485 Sensor node provides 6 channel analog input and 1 SHT1x Humidity & Temperature digital input. The RS485 protocol supports up to 254 nodes at 1200m distance between each node. This allows a wide range cover for monitoring the environment. A screw free design allows easy connection of cables without...

Sensor / Motor Drive Board
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Price: $136.27
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DFRobot Item #: DFR0057 -

This Sensor/Motor Drive Board (Cortex M3 CPU) is the integration of multiple communication interfaces that quickly build robotic systems. This board (Cortex M3 CPU) features the SPI Interface and works as a bridge between the whole system. There are many types of sensors on the board such as I2C bus communication protocol sensors, Ultrasonic sensors, SP03 TTS, CMP03 electronic compass, RS485-bus sensors, analog output sensors, infrared distance sensors, gyro sensors, acceleration sensors, and...

Sharp GP2Y0A02YK IR ranger sensor (20-150cm)
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Price: $29.13
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DFRobot Item #: SEN0013 -

This SHARP infrared distance sensor takes a continuous distance reading and returns a corresponding analog voltage with a range of 20cm (8") to 150cm (60"). It can be usually applied as obstacle avoidance and path planning sensor.|Specification| Detection Range :20-150cm (7.9-59'') Voltage :4-5 .5 V Current :33-50 mA current consumption Output: analog output, the output voltage is proportional to detection range|Documents| Datasheet ...

SHARP GP2Y0A41SKOF Infrared Distance Sensor (4-30cm)
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Price: $16.38
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DFRobot Item #: SEN0143 -

This Infrared Proximity Sensor made by Sharp (model: GP2Y0A41SKOF) has an analog output which varies from 3.1V (4cm) to 0.3V (30cm) with a supply voltage between 4.5 and 5.5V DC. This sensor is great for sensing objects up to 30 cm away. It has a Japanese Solderless Terminal (JST) Connector which is compatible with our JST accessories. SHARP GP2Y0A41SKOF Infrared Distance Sensor Related Projects:Project 1: How To DIY a Robot with Function of Gap AvoidanceWhen the robot wanders around and...

Sharp GP2Y0A710K Distance Sensor (100-550cm)
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Price: $42.23
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DFRobot Item #: SEN0085 -

The GP2Y0A710K infrared sensor is a new version of GP2Y0A700K which takes a continuous distance reading and reports the distance as an analog voltage with a distance range of 1m (39.3") to 5.5m (216.5").The interface is 5-wire JST connector (included with pins) with dual Vcc, dual Gnd, and a single output voltage. Power, ground and signal wiring is enough to read a continuous analog voltage representing distance. A software lookup table can be implemented to translate the voltages to...

Sharp GP2Y1010AU0F Compact optical Dust Sensor
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Price: $19.82
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DFRobot Item #: SEN0144 -

Sharp optical dust sensor has an internal infrared diode and a phototransistor diagonally arranged. The diode projects light and the phototransistor detects the dark spots caused by the fine particles passing through. In addition to this feature, depending on the pulse pattern outputted you can check whether or not is smoke or dust. This is the sensor you will need if you want to measure air particles, build an air purifier system, or detect certain particles. Includes a special cable to...

SHT20 I2C Temperature &; Humidity Sensor (Waterproof Probe)
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Price: $38.79
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DFRobot Item #: SEN0227 -

This SHT20 I2C temperature & humidity sensor is equipped with waterproof probe. It comes with the 4C CMOSens® SHT20 temperature & humidity sensor chip and the probe has gone through dual waterproof protection test.The SHT20 I2C temperature & humidity sensor adopt Sensirion techniques. Except the humidity sensor of capacitive type and the temperature sensor of band gap , SHT20 contains an amplifier, A/D converter, OTP memory and a digital processing unit. Compared with early SHT1x series...

SLAMTEC Mapper Developer Kit - Laser Mapping Sensor (M1M1)
Price: $558.44
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Sparkfun Item #: SEN-15870 -

The SLAMTEC Mapper Developer Kit is a new type of laser sensor introduced by (you guessed it) SLAMTEC, which is different from the traditional LIDAR. It has built-in functions of simultaneous localization and mapping (SLAM), and is suitable for many applications such as robot navigation and positioning, environmental mapping and hand-held measurement. The Developer Kit uses SLAMTEC's unique SLAM optimization algorithm and high-performance LIDAR to fuse map data more than 10 times per second...

SLAMTEC Mapper Pro Kit - Laser Mapping Sensor (M2M1)
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Price: $2,573.72
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Sparkfun Item #: SEN-15871 -

The SLAMTEC Mapper Pro Kit is a new type of laser sensor introduced by (you guessed it) SLAMTEC, which is different from the traditional LIDAR. It has built-in functions of simultaneous localization and mapping (SLAM), and is suitable for many applications such as robot navigation and positioning, environmental mapping and hand-held measurement. The Developer Kit uses SLAMTEC's unique SLAM optimization algorithm and high-performance LIDAR to fuse map data more than 10 times per second and...

Smart Grayscale Sensor
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Price: $12.24
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DFRobot Item #: SEN0147 -

This time we reinvented the line-tracking sensor. Beyond recognizing two specific colors or output through digital or analog only, the Smart Gray Sensor has integrated both digital and analog output features. In digital mode, user can have two color data recorded through simple button operation, to achieve two-color detections with high and low outputs, and requires no more configuration after being set. In analog mode, the output value reacts precisely to the color grayscale detected. Apart...

SoftPot Membrane Potentiometer - 200mm
Price: $24.98
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Sparkfun Item #: SEN-08679 -

These are very thin variable potentiometers. By pressing down on various parts of the strip, the resistance linearly changes from 100Ohms to 10,000Ohms allowing the user to very accurately calculate the relative position on the strip. Can be used as an accurate positional indicator for CNC head positioning, variable user input (volume level input for example), straight user input (multiple button areas translate to given resistance levels), and many other applications. Unit comes with adhesive...

SoftPot Membrane Potentiometer - 500mm
Price: $49.96
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Sparkfun Item #: SEN-08681 -

These are very thin variable potentiometers. By pressing down on various parts of the strip, the resistance linearly changes from 100Ohms to 10,000Ohms allowing the user to very accurately calculate the relative position on the strip. Can be used as an accurate positional indicator for CNC head positioning, variable user input (volume level input for example), straight user input (multiple button areas translate to given resistance levels), and many other applications. Unit comes with adhesive...

SoftPot Membrane Potentiometer - 50mm
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Price: $11.37
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Sparkfun Item #: SEN-08680 -

These are very thin variable potentiometers. By pressing down on various parts of the strip, the resistance linearly changes from 100Ohms to 10,000Ohms allowing the user to very accurately calculate the relative position on the strip. Can be used as an accurate positional indicator for CNC head positioning, variable user input (volume level input for example), straight user input (multiple button areas translate to given resistance levels), and many other applications. Unit comes with adhesive...

SparkFun Air Quality Breakout - CCS811
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Price: $37.45
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Sparkfun Item #: SEN-14193 -

The CCS811 Air Quality Breakout is a digital gas sensor solution that senses a wide range of Total Volatile Organic Compounds (TVOCs), including equivalent carbon dioxide (eCO2) and metal oxide (MOX) levels. VOCs are often categorized as pollutants and/or sensory irritants and can come from a variety of sources like construction materials (paint, carpet, etc.), machines (copiers, processors, etc.) and even people (breathing, smoking, etc.). This breakout is intended for indoor air quality...

SparkFun Air Quality Sensor - SGP30 (Qwiic)
Price: $37.18
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Sparkfun Item #: SEN-16531 -

The SparkFun SGP30 Air Quality Sensor provides information on the quality of the air in your room or house by monitoring the volatile organic compounds around the sensor. The SGP30 Air Quality Sensor can return valid indoor air quality (IAQ) readings within 15 seconds of powering up! By comparison, typical air quality (IAQ) sensors are great for measuring CO2 and volatile organic compounds (VOCs) but some of them require a burn-in time of 48 hours and a 20-min start up time. Along with a very...

SparkFun Altitude/Pressure Sensor Breakout - MPL3115A2
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Price: $26.72
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Sparkfun Item #: SEN-11084 -

Life has its ups and downs, so why not measure them? The MPL3115A2 is a MEMS pressure sensor that provides Altitude data to within 30cm (with oversampling enabled). The sensor outputs are digitized by a high resolution 24-bit ADC and transmitted over I2C, meaning it's easy to interface with most controllers. Pressure output can be resolved with output in fractions of a Pascal, and Altitude can be resolved in fractions of a meter. The device also provides 12-bit temperature measurements in...

SparkFun Ambient Light Sensor - VEML6030 (Qwiic)
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Price: $10.72
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Sparkfun Item #: SEN-15436 -

Looking for an option to sense ambient light? The VEML6030 Qwiic board is a great starter option. The VEML6030 is a high accuracy ambient light sensor with 16-bit resolution. Even more impressive is that it can detect light similar to the human eye response. 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 SparkFun Ambient Light Sensor reads ambient...

SparkFun Ambient Light Sensor Breakout - TEMT6000
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Price: $8.71
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Sparkfun Item #: BOB-08688 -

Basic breakout board for the TEMT6000 Ambient Light Sensor. Only what you need, nothing you don't. Sensor acts like a transistor - the greater the incoming light, the higher the analog voltage on the signal pin. Documents: Hookup Guide Datasheet GitHub ...

SparkFun Atmospheric Sensor Breakout - BME280
Price: $35.66
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Sparkfun Item #: SEN-13676 -

The SparkFun BME280 Atmospheric Sensor Breakout is the easy way to measure barometric pressure, humidity, and temperature readings all without taking up too much space. Basically, anything you need to know about atmospheric conditions you can find out from this tiny breakout. The BME280 Breakout has been design to be used in indoor/outdoor navigation, weather forecasting, home automation, and even personal health and wellness monitoring. The on-board BME280 sensor measures atmospheric pressure...

SparkFun Atmospheric Sensor Breakout - BME280 (Qwiic)
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Price: $26.72
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Sparkfun Item #: SEN-15440 -

The SparkFun BME280 Atmospheric Sensor Breakout is an easy way to measure barometric pressure, humidity, and temperature readings, all without taking up too much space. Basically, you can find out anything you need to know about atmospheric conditions from this tiny breakout. The BME280 Breakout has been designed to be used in indoor/outdoor navigation, weather forecasting, home automation, and even personal health and wellness monitoring. Utilizing our handy Qwiic system, no soldering is...

SparkFun Barometric Pressure Sensor Breakout - BMP180
Price: $17.30
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Sparkfun Item #: SEN-11824 -

"This is a breakout board for the Bosch BMP180 high-precision, low-power digital barometer. The BMP180 offers a pressure measuring range of 300 to 1100 hPa with an accuracy down to 0.02 hPa in advanced resolution mode. It’s based on piezo-resistive technology for high accuracy, ruggedness and long term stability. These come factory-calibrated, with the calibration coefficients already stored in ROM. What makes this sensor great is that it is nearly identical to its former rev, the...

SparkFun Barometric Pressure Sensor Breakout - MPL115A1
Price: $24.93
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Sparkfun Item #: SEN-09721 -

Now mounted on a breakout board, the MPL115A1 is a digital barometer that uses MEMs technology to give accurate pressure measurements between 50kPa and 115kPa. We stock the SPI interface version of the sensor. Average current consumption is 10µA at one measurement per second. The sensor outputs both temperature and pressure readings on the SPI bus. See page 3 of the datasheet for information on how to take readings from the pressure sensor. Features: Wide supply voltage range -40°C to 105°C...

SparkFun Capacitive Touch Breakout - AT42QT1010
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Price: $12.42
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Sparkfun Item #: SEN-12041 -

If you need to add user input without using a button, then a capacitive touch interface might be the answer. The AT42QT1010 SparkFun Capacitive Touch Breakout offers a single, momentary capacitive touch button with easy-to-use digital I/O pins. The AT42QT1010 is a dedicated, single-button capacitive sense chip. The chip handles monitoring a conductive area for touch. As long as a touch (e.g., from a finger) is detected, the AT42QT1010 keeps the output line high. Otherwise, the line is kept...

SparkFun Capacitive Touch Breakout - AT42QT1011
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Price: $10.63
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Sparkfun Item #: SEN-14520 -

If you need to add user input without using a button, then a capacitive touch interface might be the answer. The AT42QT1011 SparkFun Capacitive Touch Breakout offers a single, momentary capacitive touch button with easy-to-use digital I/O pins. The AT42QT1011 is a dedicated, single-button capacitive sense chip. The chip handles monitoring a conductive area for touch. As long as a touch (e.g., from a finger) is detected, the AT42QT1011 keeps the output line high. Otherwise, the line is kept...

SparkFun Capacitive Touch Slider - CAP1203 (Qwiic)
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Price: $10.72
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Sparkfun Item #: SEN-15344 -

Do you want to replace a slider or a button on your art project or science experiment with a more interesting interface? This Capacitive Touch Slider is a "Qwiic" and easy way to add capacitive touch to your next project. With the board's built in touch pads, you can immediately start playing with the touch capabilities as three unique touch inputs or as a slider. You can also enable a touch input to act as a power button, customize the sensitivity for your own touch pads, and play with the...

SparkFun Coulomb Counter Breakout - LTC4150
Price: $24.93
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Sparkfun Item #: BOB-12052 -

Odometers are extremely useful for cars, they tell you how far you have gone, wouldn't it be nice if you were able to have a device that does the same for electrical current? The LTC4150 SparkFun Coulomb Counter Breakout is here to be your odometer for current. If you are wondering: a coulomb is defind as, to put it simply, one amp for one second. This breakout is capable of constantly monitoring the current your sensor is using, is able to add it up, and will give you a pulse each time a...

SparkFun Current Sensor Breakout - ACS723
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Price: $16.00
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Sparkfun Item #: SEN-13679 -

The SparkFun Current Sensor Breakout is a high accuracy board that utilizes the ACS723 for moderate AC and DC current sensing applications. The ACS723 sensor uses a Hall effect sensor to output a voltage relative to the current flowing through the IP+ and IP- pins on the board. The advantage of using a Hall effect sensor, specifically, is that the circuit being sensed and the circuit reading the sensor are electrically isolated meaning that, although your Arduino is running on 5V, the sensed...

SparkFun Current Sensor Breakout - ACS723 (Low Current)
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Price: $28.51
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Sparkfun Item #: SEN-14544 -

The low current version of the SparkFun Current Sensor Breakout is a high accuracy board that utilizes the ACS723 for low to moderate AC and DC current sensing applications. The ACS723 sensor uses a Hall effect sensor to output a voltage relative to the current flowing through the IP+ and IP- pins on the board. The advantage of using a Hall effect sensor, specifically, is that the circuit being sensed and the circuit reading the sensor are electrically isolated meaning that, although your...

SparkFun Current Sensor Breakout - INA169
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Price: $17.78
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Sparkfun Item #: SEN-12040 -

The INA169 is a “high-side current monitor,” which means that you place a resistor (a “shunt resistor”) on the positive power rail and the INA169 measures the voltage drop across that resistor. The INA169 outputs a small current based on the measured voltage drop. If you place a resistor from the output of the INA169 to ground, you can measure the voltage at the output. Input common-mode and power supply voltages are independent and can range from 2.7V to 60V on the INA169 and quiescent...

SparkFun Digital Temperature Sensor - TMP102 (Qwiic)
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Price: $10.72
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Sparkfun Item #: SEN-16304 -

We all like to know the temperature, right? Well, with the SparkFun TMP102 Digital Temperature Sensor, we've made it just about as easy as it gets. Based on the original Digital Temperature Sensor Breakout - TMP102, we've added Qwiic connectors to bring this board into our plug-and-play Qwiic Ecosystem and added an address jumper instead of breaking out the address pin. However, we still have broken out 0.1"-spaced pins in case you prefer to use a breadboard. The TMP102 itself is an...

SparkFun Digital Temperature Sensor Breakout - TMP102
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Price: $8.94
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Sparkfun Item #: SEN-13314 -

The TMP102 is an easy-to-use digital temperature sensor from Texas Instruments. The TMP102 breakout allows you to easily incorporate the digital temperature sensor into your project. While some temperature sensors use an analog voltage to represent the temperature, the TMP102 uses the I2C bus of the Arduino to communicate the temperature. Needless to say, this is a very handy sensor that doesn't require much setup. The TMP102 is capable of reading temperatures to a resolution of 0.0625°C, and...

SparkFun Distance Sensor Breakout - 4 Meter, VL53L1X (Qwiic)
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Price: $41.82
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Sparkfun Item #: SEN-14722 -

This SparkFun Distance Sensor Breakout utilizes the VL53L1X next generation ToF (Time of Flight) sensor module to give you the highly accurate measurements at long ranges for its size. The VL53L1X uses a VCSEL (Vertical Cavity Surface Emitting Laser) to emit an Infrared laser to time the reflection to the target. That means that you will be able to measure the distance to an object from 40mm to 4m away with millimeter resolution! To make it even easier to get your readings, all communication...

SparkFun Edge Development Board - Apollo3 Blue
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Price: $34.74
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Sparkfun Item #: DEV-15170 -

Edge computing is here! You've probably heard of this latest entry to the long lineage of tech buzzwords like "IoT," "LoRa," and "cloud" before it, but what is “the edge” and why does it matter? The cloud is impressively powerful but all-the-time connection requires power and connectivity that may not be available. Edge computing handles discrete tasks such as determining if someone said "yes" and responds accordingly. The audio analysis is done at the edge rather than on the web. This...

SparkFun Electret Microphone Breakout
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Price: $12.42
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Sparkfun Item #: BOB-12758 -

This small breakout board couples an Electret microphone (100Hz--10kHz) with a 60x mic preamplifier to amplify the sounds of voice, claps, door knocks or any sounds loud enough to be picked up by a microcontroller’s analog-to-digital converter. Each breakout comes fully assembled and works from 2.7V up to 5.5V. The Electret Mic Breakout translates amplitude (not volume) by capturing sound waves between two conducting plates (one a vibrating diaphragm and the other fixed) in the microphone and...

SparkFun Environmental Combo Breakout - CCS811/BME280 (Qwiic)
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Price: $65.64
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Sparkfun Item #: SEN-14348 -

The SparkFun CCS811/BME280 Environmental Combo Breakout takes care of all your atmospheric-quality sensing needs with the popular CCS811 and BME280 ICs. This unique breakout provides a variety of environmental data, including barometric pressure, humidity, temperature, TVOCs and equivalent CO2 (or eCO2) levels. To make it even easier to use this breakout, all communication is enacted exclusively via I2C, utilizing our handy Qwiic system. However, we still have broken out 0.1" spaced pins in...

SparkFun Environmental Sensor Breakout - BME680 (Qwiic)
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Price: $33.87
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Sparkfun Item #: SEN-16466 -

The SparkFun BME680 Environmental Sensor is a breakout that combines a gas sensor with temperature, humidity and barometric pressure sensing for a complete environmental sensor in a single package. The gas sensor on the BME680 can detect a wide variety of volatile organic compounds (or VOC for short) to monitor indoor air quality. Combine that with precise temperature, humidity, and barometric pressure and the BME680 can work as a completely standalone environmental sensor all in a 1in. x 1in....

SparkFun Gas Sensor Breakout
Price: $1.71
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Sparkfun Item #: BOB-08891 -

This is a simple breakout board for the MQ - 3, MQ - 4, MQ - 6, MQ - 7, and MQ - 8 gas sensors. With the Gas Sensor Breakout you will be able to utilize each oversized, oddly spaced pins featured on every MQ gas sensor product. This is an extremely handy and economical board to have around when detecting multiple types of gases. All you need is the VCC at 5V, GND, and a resistor to an ADC, that is it! Note: This is just the PCB. The appropriate sensors are listed below in the Recommended...

SparkFun gator:control ProtoSnap
Price: $17.78
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Sparkfun Item #: COM-14968 -

The SparkFun gator:control ProtoSnap is one of a series of gator-clippable accessories called gator:boards that have been created to directly interface with the micro:bit or to other micro controllers! The gator:control ProtoSnap offers a handful of ways to interact with projects you create using only gator-clip cables. Each little board on this ProtoSnap can be kept as a whole while on the board or broken apart for individual use! The gator:control ProtoSnap contains four boards in the main...

SparkFun gator:environment - micro:bit Accessory Board
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Price: $37.18
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Sparkfun Item #: SEN-15269 -

The SparkFun gator:environment micro:bit Accessory Board utilizes the popular CCS811 and BME280 ICs to take care of all of your environmental readings of atmospheric quality. This sensor board can provide a variety of environmental data, including barometric pressure, humidity, temperature, equivalent TVOCs and equivalent CO2 (or eCO2) levels. The gator:environment connects to the SparkFun gator:bit via alligator-clip cables, allowing for easy access to the micro:bit's I2C pins. The CCS811 is...

SparkFun gator:microphone - micro:bit Accessory Board
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Price: $12.78
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Sparkfun Item #: SEN-15289 -

The SparkFun gator:microphone is a micro:bit Accessory Board that integrates an electret microphone into SparkFun's gator:bit series of gator-clippable accessories, enabling it to be easily interfaced with the micro:bit or other microcontrollers! It provides a binary indication of the presence of sound and an analog representation of its amplitude. The gator:microphone consists of four pads for power and data. There is also a switch on the board to select different audio amplification levels....

SparkFun gator:particle - micro:bit Accessory Board
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Price: $19.75
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Sparkfun Item #: SEN-15271 -

The SparkFun gator:particle micro:bit Accessory Board incorporates the powerful MAX30102 sensor, enabling sensing of pulse oximetry (SpO2) & heart rate (HR) monitoring. As part of SparkFun's gator:bit series of alligator-clippable accessories, it can be easily interfaced with the micro:bit or other microcontrollers via the SparkFun gator:bit! The MAX30102 includes internal LEDs, photodetectors, optical elements, and low-noise electronics with ambient light rejection. The idea is to pulse the...