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2477-POLOLU Carrier for Sharp GP2Y0A60SZLF Analog Distance Sensor, 3V
US$4.13
This compact carrier board makes it easy to integrate a Sharp GP2Y0A60SZLF analog distance sensor (not included) into your project by providing all of the required external components and a 0.1″-pitch, four-pin interface to the sensor. This version of the carrier board is configured for 3V mode.
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2467-POLOLU Sharp GP2Y0A60SZLF Analog Distance Sensor 10-150cm
US$13.65
The GP2Y0A60SZ distance sensor from Sharp offers a wide detection range of 4″ to 60″ (10 cm to 150 cm) and a high update rate of 60 Hz. This sensor requires additional components that can be found on ourcarrier for Sharp GP2Y0A60SZLF sensors (2475-POLOLU).
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Adafruit 9-DOF Absolute Orientation IMU Fusion Breakout - BNO055
US$53.82
Rather than spending weeks or months fiddling with algorithms of varying accuracy and complexity, you can have meaningful sensor data in minutes thanks to the BNO055 - a smart 9-DOF sensor that does the sensor fusion all on its own!  You can read the data right over I2C and Bob's yer uncle.
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SCT-013-000 Non-invasive AC Current Sensor (100A max)
US$15.33
Specifications: Input Current: 0~100A AC. Output Mode: 0~50mA. Non-linearity: ±3%. Turn Ratio: 100A:0.05A. Resistance Grade: Grade B. Work Temperature: -25°C ~ ﹢70°C. Dielectric Strength(between shell and output): 1000V AC/1min 5mA. Leading Wire in Length: 1m. Open Size: 13mm x 13mm.
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TEM01071B G1/4" Water Flow Sensor
US$15.33
This consists of a plastic valve body, a water rotor, and a hall-effect sensor. When water flows through the rotor, rotor rolls. Its speed changes with different rate of flow.
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2384-ADA Medium Vibration Sensor Switch
US$1.53
These spring-vibration switches are medium sensitivity non-directional vibration induced trigger switches.
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SEN-13285 PIR Motion Sensor (JST)
US$17.88
This is a simple to use motion sensor. Power it up and wait 1-2 seconds for the sensor to get a snapshot of the still room. If anything moves after that period, the ‘alarm’ pin will go low. This unit works great from 5 to 12V. You can also install a jumper wire past the 5V regulator on board to make this unit work at 3.3V. Sensor uses 1.6mA@3.3V.
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SEN-12784 SparkFun ToF Range Finder Breakout - VL6180
US$31.19
This is a breakout for the VL6180 distance sensor. Unlike most distance sensors that rely reflected light intensity or reflected angles to determine range, the VL6180 uses a precise clock to measure the time it takes light to bounce back from a surface.
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2349-ADA Reflective IR Sensor with 470 and 10K Resistors
US$3.93
This is a simple plastic casing with two elements - an IR LED and an IR phototransistor.
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SEN-11005 Non-Invasive Current Sensor - 30A
US$16.73
This particular current sensor will measure a load up to 30 Amps which makes it great for building your own energy monitor to keep your power usage down, or even building an over-current protection device for an AC load.
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961-POLOLU QTR-8RC Reflectance Sensor Array
US$13.93
This sensor module has 8 IR LED/phototransistor pairs mounted on a 0.375" pitch, making it a great detector for a line-following robot. 
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KIT-13198 SparkFun RFID Starter Kit
US$72.73
This is an all-in-one kit that offer everything you need to get your next RFID project off the ground. This kit includes our USB RFID Reader, ID-12LA RFID module, and two 125kHz RFID cards. We’ve done away with the annoying clamshell and now offer this in the same type of box as the rest of our kits.
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PI-ARD-SENSORS GETTING STARTED WITH SENSORS KIT
US$109.13

This kit teaches you how to connect and read sensors through a series of short projects using the popular Arduino or Raspberry Pi microcontrollers. In the included fully-illustrated book you will gain hands-on experience with some of the most useful and instructive sensors available. Note that Arduino and Raspberry Pi are not included in this kit.

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KIT0011 27 Pcs Sensor Set for Arduino
US$125.93
If you want to start playing with sensors, this kit will be the perfect choice for you to get started. It comes with bundle of the most popular DFRobot sensors such as light, gas, sound, touch, accelerometer and lots more which gives unlimited possibility to sense the physical world on your embedded devices.
Delivery within 2-3 weeks
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NJK-5002C Hall Sensor Proximity Switch NPN 3-wires Normally Open Type
US$9.09
This Inductive Proximity Switch Sensor is ideal for detecting the presence of ferrous or magnetic objects to determine rotational speed, the presence or absence of parts, or position limits.
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