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Piezo Element
$2.90  
2 pc(s)
Piezo elements come in handy when you need to detect vibration or a knock. You can use these for tap or knock sensors pretty easily by reading the voltage on the output. They can also be used for a very small audio transducer such as a buzzer. Documents: Datasheet...
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Sharp Infrared Distance Sensor GP2Y0A02YK - 20 to 150cm
$16.80  
5 pc(s)
This popular sensor made by Sharp produces an analog output that varies from 2.5V at 20cm to 0.4V at 150cm. The sensor has a Japanese Solderless Terminal (JST) Connector. You can purchase a pre-made cable with connector that mates with this sensor. See 3-pin Cable for Sharp Sensors...
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Infrared Receiver Diode (TSOP38238)
$3.00  
33 pc(s)
Use this simple IR receiver for infrared remote control of your next project. With low power consumption and an easy to use package, it mates well with embedded electronics and can be used with common IR remotes. The TSOP38238 is a miniaturized receiver for infrared remote control...
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Mini Photocell (LDR - Light Dependent Resistor)
$1.00  
68 pc(s)
This is a very small photocell. A photocell changes (also called a photodetector , CdS or photoconductive cell) resistance depending on the amount of light it is exposed to. These little sensors make great ambient light triggers (when light in the room turns on, do something)....
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-15%
PIR Motion Sensor
$13.20 $15.50  
5 pc(s)
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. Red wire is power (5 to 12V). White wire is GND. Black wire is open collector Alarm....
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