Sensors

US$2.09
This is a 3V 38 kHz Infrared sensor used for receiving commands from a TV remote control and compatible with the Arduino code library.
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US$20.93
This is a long range infrared proximity sensor with an analog output. This has an analog output that varies from 3.1V at 10cm to 0.4V at 80cm. The sensor has a Japanese Solderless Terminal (JST) Connector.
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US$11.13
Features: Mounting hole distance: 14mm. Compatibility with Sharp GP2D12, Sharp GP2Y0A21 and Sharp GP2Y0A02YK. Size: 45mm x 20mm x 15mm.
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US$2.73
This detects whether a magnet is near. Useful for non-contact/waterproof type switches, position sensors, rotary/shaft encoders.
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US$26.17
Runs from 1.8-3.6 volts (3.3 is suggested), with ratiometric output. That means that 0g measurement output is always at half of the supply voltage Vdd, -3g is at 0v and 3g is at Vdd with full scaling in between. 0.75"x0.75".
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US$17.50
This one has an adjustable delay before firing (approx 0.3-18 seconds), adjustable sensitivity and we include a 1 foot (30 cm) cable with a socket so you can easily reposition the sensor or mount it using the two drills on either side.
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US$13.13
This is a nice way to add a small-distance proximity sensor to your microcontroller project.
Delivery within 2-3 weeks
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US$11.13
This is a 14 pin LGA package low power triple axis accelerometer. The sensor has a g-Select input which allows for the selection between two measuring ranges - ±1.5g or ±6g.
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US$2.27

The TMP36 is a low voltage, precision centigrade temperature sensor. It provides a voltage output that is linearly proportional to the Celsius temperature. It also doesn't require any external calibration to provide typical accuracies of ±1°C at +25°C and ±2°C over the −40°C to +125°C temperature range.

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US$6.32
This 12 inch (30 cm) 3-pin cable mates with the connector on the Sharp IR Sensor (28995) and allows convenient connection to standard 0.1" 3-pin (servo-style) headers.
Delivery within 2-3 weeks
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US$4.89
Reports degrees C with 9 to 12-bit precision, -55C to 125C (+/-0.5C). Each sensor has a unique 64-Bit Serial number etched into it - allows for a huge number of sensors to be used on one data bus.
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US$27.91
This is a 36" high temperature Type-K Thermocouple with glass braid insulation. Features: Type-K Thermocouple (Ni-Cr). 30 gauge stripped and prepped wires. Thermocouple range : -270 to +1372C (-454 to +2501F). Glass braid insulation range : -73 to +482C(-100 to +900F). Yellow + / Red -. 
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US$15.33
This is a relative humidity sensor module comprised of a capacitive type humidity sensor, a CMOS capacitor to frequency converter and an EEPROM used to hold the calibration factors. Due to the characteristics of capacitor type humidity sensor, the system can respond to humidity change very quickly.
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US$37.45

This ultrasonic range finder from Maxbotix has the widest and most sensitive beam pattern of any unit from LV‑MaxSonar‑EZ sensor line. This is an excellent choice for use where high sensitivity, wide beam, or people detection is desired. 

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US$60.13

This ultrasonic range finder from Maxbotix is an excellent choice wherever wide beam detection, reliable people detection, or reliable small obstacle detection are required. This offers the widest and most sensitive beam pattern of any indoor sensor we currently offer.

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