Bend / flex sensor 4.5″: ($9.95) As the sensor is flexed, the resistance across the sensor increases.
Fabric/stretch sensor 2″ ($.8.95): When relaxed the sensor material has a nominal resistance of 1000 ohms per linear inch. As the stretch sensor is stretched the resistance gradually increases.
Electroluminescent “wire” (EL-wire) 3.2mm ($1.50): A wire that gives off a bright neon light glow.
Alcohol sensor: Sensor provides an analog resistive output based on alcohol concentration.
24 VDC Type Solenoid ($1.50): a loop of wire, often wrapped around a metallic core, which produces a magnetic field when an electric current is passed through it.
Linear actuator ($4.99): A linear actuator is a device that applies force in a linear manner, as opposed to rotationally like an electric motor.
Fiber optic cable ($0.50): functions as a “light guide,” guiding the light introduced at one end of the cable through to the other end.
Tiny potentiometer ($.0.50): a three-terminal resistor with a sliding contact that forms an adjustable voltage divider.
Conductive fabric ($3.95): a device used to prevent electrostatic discharge (ESD) by safely grounding a person working on electronic equipment
Thermochromic paint/dye ($22.99): change color due to a change in temperature
Nitinol / shape memory alloy wire ($1.80): an alloy that “remembers” its original, cold, forged shape, and which returns to that shape after being deformed by applying heat.
Conductive paint ($7.50):
Neodymium magnets ($.0.10): currently the strongest type of permanent magnet.
Copper foil ($1.09): 0.003″ Thick x 3″ wide
Tilt sensor ($5.23): can measure the tilting in often two axes of a reference plane in two axes. In contrast, a full motion would use at least three axes and often additional sensors.
Peltier Junction ($12.95): the direct conversion of temperature differences to electric voltage and vice versa. Can be used to generate electricity, to measure temperature, to cool objects, or to heat them or cook them.
Interesting Component: Sun Tracking Solar Panel w/ Arduino
Most Bizarre Component: Psychedelic Bong Smoke Machine Thing
Here’s a video that describes the components in it.