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Flex Sensor 4.5"
Price: $20.98
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Sparkfun Item #: SEN-08606 -

"A simple flex sensor 4.5" in length. As the sensor is flexed, the resistance across the sensor increases. Patented technology by Spectra Symbol - they claim these sensors were used in the original Nintendo Power Glove. I love the Nintendo Power Glove. It’s so bad! The resistance of the flex sensor changes when the metal pads are on the outside of the bend (text on inside of bend). Connector is 0.1" spaced and bread board friendly. Check datasheet for full specifications. Documents:...

Flex Sensor 2.2"
Price: $13.25
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Sparkfun Item #: SEN-10264 -

"A simple flex sensor 2.2" in length. As the sensor is flexed, the resistance across the sensor increases. Patented technology by Spectra Symbol - they claim these sensors were used in the original Nintendo Power Glove. I love the Nintendo Power Glove. It’s so bad! The resistance of the flex sensor changes when the metal pads are on the outside of the bend (text on inside of bend). Connector is 0.1" spaced and bread board friendly. Check datasheet for full specifications. Note: Please...

Force Sensitive Resistor - Square
Price: $13.08
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Sparkfun Item #: SEN-09376 -

"This is a force sensitive resistor with a square, 1.75x1.5", sensing area. This FSR will vary its resistance depending on how much pressure is being applied to the sensing area. 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. Two pins extend from the bottom of the sensor with 0.1" pitch making it bread board friendly. There is a...

Force Sensitive Resistor 0.5"
Price: $11.58
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Sparkfun Item #: SEN-09375 -

"This is a force sensitive resistor with a round, 0.5" diameter, sensing area. This FSR will vary its resistance depending on how much pressure is being applied to the sensing area. 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. Two pins extend from the bottom of the sensor with 0.1" pitch making it bread board friendly. There is a...

Piezo Vibration Sensor - Small Horizontal
Price: $4.92
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Sparkfun Item #: SEN-09198 -

"The Minisense 100 from Measurement Specialties is a low-cost cantilever-type vibration sensor loaded by a mass to offer high sensitivity at low frequencies. Useful for detecting vibration and ‘tap’ inputs from a user. A small AC and large voltage (up to +/-90V) is created when the film moves back an forth. A simple resistor should get the voltage down to ADC levels. Can also be used for impact sensing or a flexible switch. Comes with machine pins that allows for horizontal...

SoftPot Membrane Potentiometer - 50mm
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Price: $8.37
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Sparkfun Item #: SEN-08680 -

"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. Can be used as an accurate positional indicator for CNC head positioning, variable user input (volume level input for example), straight user input (multiple button areas translate to given resistance levels), and many other applications. Unit comes with...

Piezo Vibration Sensor - Small Vertical
Price: $4.92
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Sparkfun Item #: SEN-09199 -

"The Minisense 100 from Measurement Specialties is a low-cost cantilever-type vibration sensor loaded by a mass to offer high sensitivity at low frequencies. Useful for detecting vibration and ‘tap’ inputs from a user. A small AC and large voltage (up to +/-90V) is created when the film moves back an forth. A simple resistor should get the voltage down to ADC levels. Can also be used for impact sensing or a flexible switch. Comes with solder pins that allows for vertical mounting....

Force Sensitive Resistor - Small
Price: $9.64
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Sparkfun Item #: SEN-09673 -

"This is a small force sensitive resistor. It has a 0.16" (4 mm) diameter active sensing area. This FSR from Interlink Electronics will vary its resistance depending on how much pressure is being applied to the sensing area. The harder the force, the lower the resistance. When no pressure is being applied to the FSR, its resistance will be larger than 1MΩ, with full pressure applied the resistance will be 2.5kΩ. Two pins extend from the bottom of the sensor with 0.1" pitch making it...

Force Sensitive Resistor - Long
Price: $29.92
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Sparkfun Item #: SEN-09674 -

"This very long force sensitive resistor - over 2 feet - has a sensing area of 0.25x24". This FSR from Interlink Electronics will vary its resistance depending on how much pressure is being applied to the sensing area. 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. Two pins extend from the bottom of the sensor with 0.1" pitch making it...

Load Sensor - 50kg
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Price: $16.65
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Sparkfun Item #: SEN-10245 -

"This load sensor, sometimes called a strain gauge, is the same one found in digital bathroom scales (you know, the ones you use in January for your New Year’s resolutions, and then forget about a month later). This sensor can measure up to about 110 pounds. Check the video below for a simple explanation on how these work and how to use them. Documents: Specifications Getting Started with Load Cells HX711 Breakout Hookup Guide Load Sensor Tutorial (NerdKits) " ...

SparkFun OpenScale
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Price: $50.11
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Sparkfun Item #: SEN-13261 -

"The SparkFun OpenScale is a simple-to-use, open source solution for measuring weight and temperature. It has the ability to read multiple types of load cells and offers a simple-to-use serial menu to configure calibration value, sample rate, time stamp and units of precision. Simply attach a four-wire or five-wire load cell of any capacity, plug the OpenScale into a USB port, open a terminal window at 9,600bps, and you’ll immediately see mass readings. The SparkFun OpenScale will enable...

Liquid Level Sensor - 8"
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Price: $66.93
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Sparkfun Item #: SEN-10221 -

"The eTape 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. The sensor’s envelope is compressed by the hydrostatic pressure of the fluid in which it is immersed. This results in a change in resistance that corresponds to the distance from the top of the sensor to the surface of...

Flexiforce Pressure Sensor - 100lbs.
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Price: $35.56
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Sparkfun Item #: SEN-08685 -

"This is a piezoresistive force sensor from Tekscan. The harder you press, the lower the sensor’s resistance. Pressing hard, the resistance changes from infinite to ~300k. The sensor itself is thin and flexible, but the resistance does not change while being flexed. Resistance changes only when pressure is applied to the round area at the end of the sensor. Used as a presence sensor (someone standing), weight sensor, pressure sensor (impact testing), etc. The overall length is about...

Flexiforce Pressure Sensor - 1lb.
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Price: $35.56
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Sparkfun Item #: SEN-08713 -

"This is a piezoresistive force sensor from Tekscan. The harder you press, the lower the sensor’s resistance. Pressing lightly, the resistance changes from infinite to ~300k. The sensor itself is thin and flexible, but the resistance does not change while being flexed. Resistance changes only when pressure is applied to the round area at the end of the sensor. Used as a presence sensor (someone standing), weight sensor, pressure sensor (impact testing), etc. The overall length is about...

Flexiforce Pressure Sensor - 25lbs (1" area)
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Price: $41.83
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Sparkfun Item #: SEN-11207 -

"This is a piezoresistive force sensor from Tekscan. The harder you press, the lower the sensor’s resistance. Pressing hard, the resistance changes from infinite to ~50k. The sensor itself is thin and flexible, but the resistance does not change while being flexed. Resistance changes only when pressure is applied to the round area at the end of the sensor. Used as a presence sensor (someone standing), weight sensor, pressure sensor (impact testing), etc. The overall length is about...

Flexiforce Pressure Sensor - 25lbs.
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Price: $36.73
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Sparkfun Item #: SEN-08712 -

"This is a piezoresistive force sensor from Tekscan. The harder you press, the lower the sensor’s resistance. Pressing hard, the resistance changes from infinite to ~300k. The sensor itself is thin and flexible, but the resistance does not change while being flexed. Resistance changes only when pressure is applied to the round area at the end of the sensor. Used as a presence sensor (someone standing), weight sensor, pressure sensor (impact testing), etc. The overall length is about...

Geophone - SM-24
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Price: $102.48
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Sparkfun Item #: SEN-11744 -

"Need to put your finger on the pulse of the Earth? Did I just blow your mind? A geophone works by translating ground movement into voltage, which can easily be read by a microcontroller. The SM-24 geophone element is designed to offer the highest performance in seismic exploration based upon field-proven I/O Sensor technology. Low distortion, combined with excellent specifications, provide high-fidelity data. Basically, it’s a super low frequency microphone for the ground. Perfect for...

Load Cell - 10kg, Straight Bar (TAL220)
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Price: $11.63
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Sparkfun Item #: SEN-13329 -

"This straight bar load cell (sometimes called a strain gauge) can translate up to 10kg of pressure (force) into an electrical signal. Each load cell is able to measure the electrical resistance that changes in response to, and proportional of, the strain (e.g. pressure or force) applied to the bar. With this gauge you will be able to tell just how heavy an object is, if an object’s weight changes over time, or if you simply need to sense the presence of an object by measuring strain or...

Load Cell - 200kg, Disc (TAS606)
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Price: $95.29
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Sparkfun Item #: SEN-13332 -

"This disc load cell (sometimes called a strain gauge) can translate up to a whopping 200kg of pressure (force) into an electrical signal. Each load cell is able to measure the electrical resistance that changes in response to, and proportional of, the strain (e.g. pressure or force) applied to the disc. With this gauge you will be able to tell just how heavy an object is, if an object’s weight changes over time, or if you simply need to sense the presence of an object by measuring...

Load Cell - 50kg, Disc (TAS606)
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Price: $95.29
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Sparkfun Item #: SEN-13331 -

"This single disc load cell (sometimes called a strain gauge) can translate up to 50kg of pressure (force) into an electrical signal. Each load cell is able to measure the electrical resistance that changes in response to, and proportional of, the strain (e.g. pressure or force) applied to the disc. With this gauge you will be able to tell just how heavy an object is, if an object’s weight changes over time, or if you simply need to sense the presence of an object by measuring strain or...

Piezo Vibration Sensor - Large
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Price: $4.94
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Sparkfun Item #: SEN-09196 -

"This basic piezo sensor from Measurement Specialties is 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. Comes with solderable crimp pins. Features: Flexible PVDF Piezo Polymer Film Wide dynamic range Laminated for higher voltage output 0.1" breadboard friendly leads...

SoftPot Membrane Potentiometer - 200mm
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Price: $16.65
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Sparkfun Item #: SEN-08679 -

"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. Can be used as an accurate positional indicator for CNC head positioning, variable user input (volume level input for example), straight user input (multiple button areas translate to given resistance levels), and many other applications. Unit comes with...

SoftPot Membrane Potentiometer - 500mm
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Price: $28.36
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Sparkfun Item #: SEN-08681 -

"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. Can be used as an accurate positional indicator for CNC head positioning, variable user input (volume level input for example), straight user input (multiple button areas translate to given resistance levels), and many other applications. Unit comes with...

SparkFun Load Cell Amplifier - HX711
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Price: $16.65
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Sparkfun Item #: SEN-13879 -

"The SparkFun Load Cell Amplifier is a small breakout board for the HX711 IC that allows you to easily read load cells to measure weight. By connecting the amplifier to your microcontroller you will be able to read the changes in the resistance of the load cell, and with some calibration you’ll be able to get very accurate weight measurements. This can be handy for creating your own industrial scale, process control or simple presence detection. This version of the SparkFun Load Cell...

Tilt Sensor - AT407
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Price: $3.26
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Sparkfun Item #: SEN-10289 -

"This AT407 basic tilt switch can easily be used to detect orientation. Inside the can is a ball 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. There are numerous uses for these basic sensors, but keep in mind you might need to use some debouncing code, as the sensor isn’t immune to small vibrations and such. Documents: Datasheet GitHub (Firmware) " ...

Vernier Sensor - Dual-Range Force Sensor
Price: $227.87
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Sparkfun Item #: SEN-12873 -

"This is the Vernier Dual-Range Force Sensor, a great general purpose apparatus that can be used to measure the push and pull of different objects and forces. This Vernier sensor is perfect when used as a replacement for a hand-held spring scale or when mounted on a dynamics cart to track and read collisions. Studying friction, some simple harmonic motion, and centripetal force information have never been easier to read. Each Dual-Range Force Sensor has a resolution range of between 0.01...