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2-Channel Velocity Measurement Kit
Price: $19.13
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Elecrow Item #: EL-SPM6097VM -

This Kit helps you monitoring the velocity speed of motors, it uses the sensor HC-020 to sense the rotation of circular grid board, and thus output square waves. So users can calculate the rotation velocity or speed via these outputs frequency. There are 20 grids on the circular grid board, so each rising/falling edge standing an angle: 360/20= 18 degrees. Please uncover the yellow protect paper before your using. SpecificationWorking Voltage: 4.5~5.5 VDCEmitter Voltage Drop: 1.5VOutput...

AD_DA Module - PCF8591
Price: $8.12
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Elecrow Item #: EL-SOT00001A -

Have you ever wanted more analog input pins on your Arduino project, but not wanted to fork out for a Mega? Or would you like to generate analogue signals? It solves both these problems as it has a single DAC (digital to analogue) converter as well as four ADCs (analogue to digital converters), all accessible via the I2C bus. If the I2C bus is new to you, please familiarise yourself with the readings here before moving forward. This PCF8591 module operates on 3.3~5V,so can be used with an...

Analog Gas Sensor
Price: $17.23
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DFRobot Item #: DFR0049 -

Analog Gas Sensor Introduction The gas sensor detects smoke, methane, carbon dioxide and other gases. It is able to give alarms when the smoke/gas leaks.  You can adjust the sensitivity with the potentiometer. Specification Type: Analog Detector: QM-NG1 Power supply needs: 5V Current: 100mA Pin Definition:  1-Output  2-GND  3-PWR  Document Datasheet Manual Shipping List Sensor (1 unit) Analog Sensor Cable (1 unit) (SKU:FIT0031) ...

Barometer Sensor
Price: $32.77
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Elecrow Item #: EL-STH01002S -

    This Barometer Sensor has a Bosch BMP085 which is a high-accuracy chip to detect barometric pressure and temperature. It can widely measure pressure ranging from 300hPa to 1100hPa, AKA +9000m to -500m above sea level, with a super high accuracy of 0.03hPa(0.25m) in ultra-high resolution mode. This Barometer sensor compatible with 3.3V and 5V, so it can be used in Arduinos without moditdfication. Features Wide pressure range Arduino/Crowduino compatible interface (3.3V...

Barometric Pressure Sensor - BMP085 Breakout
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Price: $17.93
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Sparkfun Item #: SEN-11282 -

Barometric Pressure Sensor - BMP085 Breakout Description: This is a breakout board for the Bosch BMP085 high-precision, low-power digital barometer. The BMP085 offers a measuring range of 300 to 1100 hPa with an accuracy down to 0.2 hPa in ultra-high 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. Writing your own code for it requires...

Capacitive Touch Kit For Arduino
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Price: $33.62
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DFRobot Item #: DFR0129 -

Now, it is time to add a more fancy interactive way to your project. This DFRobot touch kit comes with three types touch sensors. An ipod styple wheel touch, a keypad touch which supports backlit and a grid touch pad which can recoginze something unique. This kit utilizes the not very "latest" capactive touch technology which make the sensing very sensitive. The kit is designed to be compatible with Arduino. Get Started with Capacitive Touch Kit Tutorial|Specification| Operation Voltage:5V...

Electronic Time Delay Module
Price: $11.20
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Elecrow Item #: EL-SPTD014M -

This time delay module provides you a way to control the time. Some time, you may want to control a LED on/off within some time, a microcontroller would be ok for such an application, but it would be troublesome, and expensive! This module would be help in these applications. With this module, you can set a delay time 0~14 minutes with the onboard potentiometer, unlike the other mechanic timer, this module is also friendly to microcontrollers, you can set the module start/stop timing, which...

Energy Monitor Shield
Price: $53.64
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Elecrow Item #: EL-COP77012DE -

Energy Monitor Shield is an Arduino-compatible expansion card designed for building energy monitoring system with LCD screen and an interface for connecting the wireless transceiver nRF24L01 +.FeaturesConnect up to three sensors AC (30-100A). Support for LCD Screen Nokia LCD5110Turn off the LCD backlight with a jumperTwo buttons to control (operate one analog pin) Interface to connect the transceiver to 2.4G nRF24L01 + GROVE-compatible connector: I2C Fully compatible with Ethernet Shield...

Gravity: 9 Pcs Sensor Set for Arduino
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Price: $40.51
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DFRobot Item #: DFR0018 -

This is DFRobot's basic sensor set for arduino. Set includes light sensor, touch sensor, temperature sensor, magnetic sensor, vibration sensor, tilt sensor, big button, LED lighting module and Grayscale sensor.To connect these sensors to Arduino, we suggest to use our IO expansion shield V7.1 which has color coded pins that provides a much easier way to link sensors to microcontroller. |Specification| Analog Ambient light sensor (DFR0026) Digital Capacitive touch sensor (DFR0030) LM35...

Gravity: Analog Alcohol Sensor (MQ3) For Arduino
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Price: $11.89
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DFRobot Item #: SEN0128 -

This is an Arduino Alcohol sensor. It uses a MQ3 probe which can be used in a Breathalyser. It has a high sensitivity to alcohol and less sensitivity to Benzine. The sensitivity is able to be adjusted by the potentiometer. The output is proportional to the density of gas. You can use analog reading to read the data from this sensor. To ease the difficulty of using this sensor, a Gravity Interface is adapted to allow plug&play. The Arduino IO expansion shield is the best match for this senor...

Gravity: Analog Soil Moisture Sensor For Arduino
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Price: $4.65
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DFRobot Item #: SEN0114 -

A soil moisture sensor can read the amount of moisture present in the soil surrounding it. It's an ideal for monitoring an urban garden, or your pet plant's water level. This is a must have component for a IOT garden / Agriculture!The new soil moisture sensor uses Immersion Gold which protects the nickel from oxidation. Electroless nickel immersion gold (ENIG) has several advantages over more conventional (and cheaper) surface platings such as HASL (solder), including excellent surface...

Gravity: Analog Voltage Divider V2
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Price: $6.38
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DFRobot Item #: DFR0051 -

The Analog Voltage Divider V2 can detect the supply voltage from 0.0245V to 25V. This module is based on resistor divider principle. The voltage detection module allows the input voltage to reduce 5 times. As the Arduino analog input voltage is normally maximum 5V, the input voltage of analog voltage detection module can not exceed 5Vx5 which is 25V.Notice: The new version of analog sensor port pin mapping has been changed as the following two features. Inprovement List Wide voltage range from...

HTU21D Humidity Sensor Breakout
Price: $17.19
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Sparkfun Item #: SEN-12064 -

HTU21D Humidity Sensor Breakout Description: The HTU21D is a low-cost, easy to use, highly accurate, digital humidity and temperature sensor. This sensor is ideal for environmental sensing and data logging and perfect for a weather stations or humidor control systems. All you need is two lines for I2C communication and you’ll have relative humidity readings and very accurate temperature readings as a bonus! There are only four pins that need to be hooked up in order...

KA2284 Voltage Level Indicator
Price: $9.29
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Elecrow Item #: EL-SEL09020K -

Use this KA2284 Voltage level indicator to you next project. It can be used for battery power quantity indicator, Voltage indicator and Audio indicator. Specification Working voltage: 3.5V-12Vthe magnitude of the level can be adjusted;AC and DC signals can be controlled by jumper;PCB board Dimension: 29 (mm) x21 (mm); Wiki & External links KA2284 Datasheet ...

Rain/Steam Sensor
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Price: $3.31
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Elecrow Item #: EL-SPM01021S -

    This water sensor works by having a series of exposed traces connected to ground and interlaced between the grounded traces are the sens traces. The sensor board has a demension of 5.0 x 4.0cm. There is also a on-board potentiometer to adjust the sensitivity, you can get the amount of water induced contact between the grounded and sensor traces.With the comparator LM393, users can get both the analog signal and digital signal.     Connect this sensor...

Sound Sensor
Price: $4.24
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Elecrow Item #: EL-SPM22101S -

Description     The Sound sensor module is a simple microphone. Based on the power amplifier LM386 and the electret microphone, it can be used to detect whether there is any sound that beyond the threshold. The threshold can be adjusted by the on-board potentiometer.     Adjust the on-board potentiometer to adjust the sensitivity. The module output HIHG/LOW when the voice is Lower/higher than the threshold set by the potentiometer. Please note that this...

Thermocouple Wire - TP01
Price: $3.87
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Elecrow Item #: EL-SPM01010S -

    The fiber optic Temperature Probe TP-01 is a high precision temperature probe for use in a wide temperature range. It is for the temprature measuring of air/solid, but not for liquid. It is a point-like probe housed in a stainless steel tube and with a connector at one end. you can also find the Thermocouple_K_Female Connetor to integrate this sensor to your PCBA Features Length:100cm Measuring Range:-50 - +400 response time: 5s ...

Triple Axis Magnetometer Breakout
Price: $10.92
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Elecrow Item #: EL-SPS05883S -

Triple Axis Magnetometer Breakout Description: This is a breakout board for Honeywell's HMC5883L, a 3-axis digital compass, provides compass heading accuracy up to 1° to 2°. Communication with the HMC5883L is simple and all done through an I2C interface. An Arduino Demo is given out to help users learn how to use this sensor. The breakout board includes the HMC5883L sensor and all filtering capacitors as shown. This module also includes a DC regular for power supply requirement. Hence...

USB Weather Board
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Price: $103.44
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Sparkfun Item #: SEN-10586 -

USB Weather Board Description: Got weather? This board can handle it. The USB Weather Board includes onboard sensors for barometric pressure, humidity, temperature, and light level. We've also added headers in the new version so you can connect the board to our weather meters (not included), adding sensors for wind speed, wind direction, and rainfall. You can send all this data to a computer or datalogger via mini-USB cable, TTL serial (3.3V), or wirelessly...