# Sensors

## Accelerometers, Gyros, & Compasses

Measure acceleration and track rotation with these accelerometers, gyroscopes, compasses/magnetometers, and combined inertial measurement units (IMUs) and orientation sensors.

## Optical Range Finders

These IR distance sensors make it easy to detect and range objects. Our Sharp sensors are less expensive than our sonar range finders and they have higher update rates, but their maximum detection range is shorter.

## Sonar Range Finders

Accurately measure distances over a wide range with our assortment of ultrasonic distance sensors from Maxbotix and Parallax.

## Pololu QTR Reflectance Sensors

These sensors use pairs of infrared LEDs and phototransistors to measure how much of the emitted IR light is being reflected from a nearby surface. They are great for edge detection and line following.

## Encoders for Micro Metal Gearmotors

These quadrature encoders can be used to add speed and position feedback to our micro metal gearmotors with extended backshafts.

## Current Sensors

An assortment of unidirectional and bidirectional Hall effect-based current sensors. They offer a very low-resistance current path and electrical isolation between the current source and the measuring circuit. You can use these sensors to monitor your motor current, detect current spikes, or even to make inexpensive current probes for your oscilloscope.

## Force-Sensing Resistors and Linear Potentiometers

These FSRs and FSLPs from Interlink Electronics can sense the magnitude, and in some cases the location, of an applied force, enabling unique touch interfaces and tactile sensors.

## Gas Sensors

Want to build your own breathalyzer? This variety of semiconductor gas sensors makes it possible to measure concentrations of gasses such as alcohol, methane, propane, butane, and carbon monoxide.

## Products in category “Sensors”

Pololu item #: 2460
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## Pololu 38 kHz IR Proximity Sensor, Fixed Gain, Low Brightness

This module features a fixed-gain, 38 kHz modulated IR sensor and a corresponding IR LED with oscillator circuit to make a tiny proximity sensor. This low-brightness version draws an average of 8 mA and has a typical sensing range up to approximately 12 inches (30 cm).

Pololu item #: 2462
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## Vishay TSSP58P38 IR Detector Module, 38kHz, Automatic Gain (3-Pack)

The Vishay TSSP58P38 is a unique modulated IR receiver that is designed for IR brightness detection instead of data communication for remote control. This sensor can be used with a 38 kHz modulated IR emitter and the appropriate algorithms to form a distance sensor with a range of up to a few feet. They are sold in packs of three units.

New!
Pololu item #: 2471
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## Vishay TSOP34156 IR Receiver Module, 56kHz

The Vishay TSOP34156 is a general-purpose modulated IR receiver for IR-based remote-control projects. It features a wide operating voltage range and allows for relatively high data rates; this particular unit is tuned for a 56 kHz carrier frequency. This is the IR receiver used in the Pololu IR Beacon.

Pololu item #: 702
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## Pololu IR Beacon Transceiver

The Pololu IR beacon is a compact board that is used in pairs to allow robots to locate each other. Each board has infrared emitters that shine in all directions and four IR receivers for detecting the other beacon. The IR beacons have a range of about fifteen feet indoors. This item is for a single unit.

Pololu item #: 704
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## LPS25H Pressure/Altitude Sensor Carrier with Voltage Regulator

This carrier for ST’s LPS25H digital barometer measures pressures from 260 mbar to 1260 mbar (26 kPa to 126 kPa) with absolute accuracy down to ±0.2 mbar (0.02 kPa) and typical RMS noise of 0.01 mbar (1 Pa) in high-resolution mode. These pressures can easily be converted to altitudes. The board has a 3.3 V linear regulator and integrated level shifters that allow it to work over an input voltage range of 2.5 V to 5.5 V, and the 0.1″ pin spacing makes it easy to use with standard solderless breadboards and 0.1″ perfboards. The sensor offers I²C and SPI interfaces.

Pololu item #: 2126
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## SparkFun Weather Shield for Arduino

The SparkFun Weather Shield is an easy-to-use Arduino shield with sensors for measuring barometric pressure, relative humidity, luminosity, and temperature.

Pololu item #: 1643
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## Advancer Technologies Muscle Sensor v3

The Muscle Sensor v3 from Advancer Technologies measures, filters, rectifies, and amplifies the electrical activity of a muscle and produces an analog output signal that can easily be read by a microcontroller, enabling novel, muscle-controlled interfaces for your projects. This small board measures 1″ × 1″ and includes six electrodes and a 24″ sensor cable.

Pololu item #: 2138
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## PIR Motion Sensor

The passive infrared (PIR) motion sensor detects movement of infrared light sources with wavelengths ranging from 7 μm to 14 μm. Since people emit infrared radiation from 8 μm to 14 μm, this an excellent sensor for detecting human movement. Two infrared detector “pixels” allow the detector to filter out changes affecting the whole sensing area, like weather or light.

Pololu item #: 1608
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## ADMP401 MEMS Microphone Breakout Board

Ready to add sound detection to your next project? This small breakout board from SparkFun couples a tiny microelectromechanical system (MEMS) microphone with a 67x gain external amplifying circuit, converting sound into analog voltage signals that can be measured by a microcontroller’s analog-to-digital converter (ADC). The unit comes fully assembled as shown and works from 1.5 to 3.3 V.

Pololu item #: 1620
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## Snap-Action Switch with 50mm Lever: 3-Pin, SPDT, 5A

This single-pole, double-throw (SPDT) momentary switch can be used as a general-purpose micro switch, but the long lever arm makes it especially useful as a tactile bump sensor for your robot (e.g whiskers or antennae). The switch body dimension is 20.0 x 6.4 x 10.2 mm, and the lever arm is 50 mm long.

Pololu item #: 1402
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## Snap-Action Switch with 16.3mm Roller Lever: 3-Pin, SPDT, 5A

This single-pole, double-throw (SPDT) momentary switch can be used as a general-purpose micro switch or tactile bump sensor for your robot. The switch body dimension is 20.0 x 6.4 x 10.2 mm, and the 16.3mm lever arm is has a roller at the tip.

Pololu item #: 1405
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## Mini Snap-Action Switch with 13.5mm Lever: 3-Pin, SPDT, 2A

This miniature single-pole, double-throw (SPDT) momentary switch can be used as a general-purpose micro switch or as a small tactile bump sensor for your robot. The switch body dimension is 12.8 x 6.0 x 6.5 mm, and the lever arm is 13.5 mm long.

Pololu item #: 320
Price: \$19.95
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## Elenco AK-510 Motion Detector Kit

Learn about electronic motion detectors with this deluxe kit that includes a high-quality enclosure with a mounting bracket. The motion detector makes a loud, doorbell-like “ding-dong” sound when it detects motion. The kit is based on a pyroelectric infrared (PIR) sensor, which is a unique sensor that you can use to give your projects the ability to react to your presence.

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