Sensors

US$17.17
The harder the force, the lower the resistance. When no pressure is being applied to the FSR its resistance will be larger than 1MΩ. This FSR can sense applied force anywhere in the range of 100g-10kg.
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US$37.73
This is a contactless linear potentiometer used for liquid level and other harsh applications. This innovative sensor allows designers to retroactively assemble the sensor on the outside of pneumatic and hydraulic cylinders, which connects with the internal magnet of the cylinder.
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US$18.07
This is a basic piezo sensor with a mass attach to the tip often used for flex, touch, vibration and shock measurements. A small AC and large voltage (up to +/-90V) is created when the film moves back and forth. A simple resistor should get the voltage down to ADC levels. Can also be used for impact sensing or a flexible switch.
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US$22.73
This is a vertical attachment of a  low-cost cantilever-type vibration sensor loaded by a mass to offer high sensitivity at low frequencies.
Delivery within 2-3 weeks
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US$16.18
This is a membrane of resistance built inside a flex strip of 50mm. 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.
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US$67.50

This Liquid Level Sensor from Milone Technologies is a great way to measure the level of a liquid. It has a resistive output that varies with the level of the fluid. It does away with clunky mechanical floats, and easily interfaces with electronic control systems.

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US$3.89
This is a basic tilt switch that can easily be used to detect orientation. Inside the can are a pair of balls that make contact with the pins when the case is upright. Tilt the case over and the balls don't touch, thus not making a connection.
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US$4.50

This is an alcohol sensor suitable for detecting alcohol concentration on your breath, just like your common breathalyzer.

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US$4.50
This is a simple-to-use Carbon Monoxide (CO) sensor, suitable for sensing CO concentrations in the air. The MQ-7 can detect CO-gas concentrations anywhere from 20 to 2000ppm.
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US$99.95
This is a fingerprint scanner capable of gathering and storing unique finger prints. The Nitgen RS232 serial fingerprint scanner is a powerful ADSP-BF531 Blackfin based system. Simply hold your finger on the optical scanner, query the device over serial, and you will be issued a unique ID. Use that ID within your embedded system to determine access levels, time clocks, door locks, etc.
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US$1.95

This is a PCB made for the MQ-3, MQ-4, MQ-6 and MQ-7 gas sensors.

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US$4.50
This is a simple-to-use liquefied petroleum gas (LPG) sensor, suitable for sensing LPG (composed of mostly propane and butane) concentrations in the air. The MQ-6 can detect gas concentrations anywhere from 200 to 10000ppm.
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US$4.50
This is a simple-to-use compressed natural gas (CNG) sensor, suitable for sensing natural gas (composed of mostly Methane [CH4]) concentrations in the air.
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US$18.64
This is an optical air quality sensor, designed to sense dust particles. An infrared emitting diode and a phototransistor are diagonally arranged into this device, to allow it to detect the reflected light of dust in air.
Delivery within 2-3 weeks
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US$31.41
A simple flex sensor 4.5" in length. Patented technology by Spectra Symbol - they claim these sensors were used in the original Nintendo Power Glove. The resistance of the flex sensor changes when the metal pads are on the outside of the bend (text on inside of bend).
Delivery within 2-3 weeks
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