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 Sparkfun products range from things like resistors and LEDs to humidity sensors and LCD screens.  Including: Books, Cables, Cellular, Components, Development Tools, E-Textiles, GPS, Kits, LCDs, Programmers, Prototyping, Sensor, Tools, Robotics, Wireless

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    One Wire Digital Temperature Sensor - DS18B20 One Wire Digital Temperature Sensor - DS18B20 This is the latest DS18B20 1-Wire digital temperature sensor from Maxim IC. Reports degrees C with 9 to 12-bit precision, -55C to 125C (+/-0.5C). Each sensor has a unique 64-Bit Serial number etched into it - allows for a huge number of sensors to be used on one data bus. This is a wonderful part that is the corner stone of many data-logging and... $4.78

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    Humidity and Temperature Sensor - DHT22 Humidity and Temperature Sensor - DHT22 The DHT-22 is a low cost humidity and temperature sensor with a single wire digital interface. The sensor is calibrated and doesn't require extra components so you can get right to measuring relative humidity and temperature.Features:3.3-6V Input1-1.5mA measuring current40-50 uA standby currentHumidity from 0-100% RH-40 - 80 degrees C temperatur... $11.25

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    TMP36 - Temperature Sensor TMP36 - Temperature Sensor  TMP36 - Temperature Sensorsku: SEN-10988    This is the same temperature sensor that is included in our SparkFun Inventor's Kit. The TMP36 is a low voltage, precision centigrade temperature sensor. It provides a voltage output that is linearly proportional to the Celsius temperature. It also doesn't require any external calibration to provide t... $1.50

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    Mini Photocell Mini Photocell 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). Features:Light resistance : ~1k OhmDark resistance : ~10k OhmMax volt... $1.50

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    Temperature Sensor - Waterproof (DS18B20) Temperature Sensor - Waterproof (DS18B20)  Temperature Sensor - Waterproof (DS18B20)sku: SEN-11050  This sealed digital temperature probe lets you precisely measure temperatures in wet environments with a simple 1-Wire interface. The DS18B20 provides 9 to 12-bit (configurable) temperature readings over a 1-Wire interface, so that only one wire (and ground) needs to be connected from a c... $14.95

    Ships in 3 to 7 days
    Hall Effect Sensor Hall Effect Sensor The US1881 is an integrated Hall effect latched sensor. That's nice but what does it do? Holding a magnet near the sensor will cause the output pin to toggle. This makes for a robust presence sensor. A reed sensor also works nicely, but can be limited by the glass encapsulation and size. A hall effect sensor is much smaller, but can handle less ... $1.10

    Ships in 24 hours
    PIR Motion Sensor PIR Motion Sensor 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). Brown wire is GND. Black wire is open collector Alarm. This unit works great from 5 to 12V (datashe... $9.95

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    IR Receiver Diode IR Receiver Diode 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 TSOP382 is a miniaturized receiver for infrared remote control systems. A PIN diode and a preamplifier are assembl... $1.95

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    Infrared Sensor Jumper Wire - 3-Pin JST Infrared Sensor Jumper Wire - 3-Pin JST Three pin JST connector with red, black, and yellow colors. 5 inch wire outs. This cable comes fully assembled as shown and connects directly to many different Sharp sensors. Quick and easy, this cable will save you 15-20 minutes over making your own wiring harness. $1.50

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    Flex Sensor 2.2" Flex Sensor 2.2" 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 ... $9.00

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    Infrared Proximity Sensor - Sharp GP2Y0A21YK Infrared Proximity Sensor - Sharp GP2Y0A21YK Infrared proximity sensor made by Sharp. Part # GP2Y0A21YK has an analog output that varies from 3.1V at 10cm to 0.4V at 80cm. The sensor has a Japanese Solderless Terminal (JST) Connector. We recommend purchasing the related pigtail below or soldering wires directly to the back of the module. This is a really hard to find item! Limit 4 pieces ... $15.00

    Ships in 3 to 7 days
    Force Sensitive Resistor 0.5" Force Sensitive Resistor 0.5" 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 sen... $6.95

    Ships in 3 to 7 days
    Digital Temperature Sensor Breakout - TMP102 Digital Temperature Sensor Breakout - TMP102 This is a breakout board for the incredibly small TMP102 digital temperature sensor. The TMP102 is a digital sensor (I2C a.k.a. TWI), has a resolution of 0.0625°C, and is accurate up to 0.5°C. The sensor requires very low-current, and is loaded with features. Communication with the TMP102 is achieved through a two-wire se... $3.95
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    RFID Reader Breakout RFID Reader Breakout This is a simple breakout board for our RFID readers. This board will bring the 2mm spaced pins out to two 0.1" spaced headers. You can solder the reader directly to the breakout board or use our 2mm sockets. Breakout board fits within and under the ID-12. The board also works with the ID-20, but is smaller than the edges of the ID-20. $0.95
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    Triple Axis Magnetometer Breakout - HMC5883L Triple Axis Magnetometer Breakout - HMC5883L Triple Axis Magnetometer Breakout - HMC5883L sku: SEN-10530  This is a breakout board for Honeywell's HMC5883L, a 3-axis digital compass. Communication with the HMC5883L is simple and all done through an I2C interface. There is no on-board regulator, so a regulated voltage of 2.16-3.6VDC should be supplied. The breakout board in... $14.95

    Ships in 3 to 7 days
    Force Sensitive Resistor - Square Force Sensitive Resistor - Square 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 any... $9.75

    Ships in 24 hours
    Triple Axis Accelerometer Breakout - ADXL335 Triple Axis Accelerometer Breakout - ADXL335 Breakout board for the 3 axis ADXL335 from Analog Devices. This is the latest in a long, proven line of analog sensors - the holy grail of accelerometers. The ADXL335 is a triple axis accelerometer with extremely low noise and power consumption - only 320uA! The sensor has a full sensing range of +/-3g.There is no on-board regulation, provided p... $14.95

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    Breakout Board for Electret Microphone Breakout Board for Electret Microphone Ready to add audio to your next project? This small breakout board couples a small electret microphone with a 100x opamp to amplify the sounds of voice, door knocks, etc loud enough to be picked up by a microcontroller's Analog to Digital converter. Unit comes fully assembled as shown. Works from 2.7V up to 5.5V. Documents:SchematicExample PIC ... $7.95

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    Infrared Proximity Sensor Short Range - Sharp GP2D120XJ00F Infrared Proximity Sensor Short Range - Sharp GP2D120XJ00F Infrared proximity sensor made by Sharp. Part # GP2D120XJ00F has an analog output that varies from 3.1V at 3cm to 0.3V at 40cm with a supply voltage between 4.5 and 5.5VDC. The sensor has a Japanese Solderless Terminal (JST) Connector. We recommend purchasing the related pigtail below or soldering wires directly to the back of the module.&... $15.89

    Ships in 3 to 7 days
    Photo Interrupter GP1A57HRJ00F Photo Interrupter GP1A57HRJ00F This sensor is composed of an infrared emitter on one upright and a shielded infrared detector on the other. By emitting a beam of infrared light from one upright to the other, the sensor can detect when an object passes between the uprights, breaking the beam. Used for many applications including optical limit switches, pellet dispensing, gener... $2.30

    Ships in 3 to 7 days
    Temperature Sensor - LM335A Temperature Sensor - LM335A The LM335A is a very easy-to-use analog temperature sensor. The LM335A works like a Zener diode with a breakdown voltage proportional to absolute temperature at 10mV/°K. Hook up a resistor from 5V and GND, and the LM335A will output an analog voltage of 2.98V (298 Kelvin is 25C or room temperature).  The output of the sensor is li... $1.65
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    Thermistor 10K Thermistor 10K 10K thermistor with a negative temperature coefficient.  Good choice for temp-sensing aplications.Vishay part #: NTCLE100E3103JB0Document: Datasheet $1.95

    Ships in 24 hours
    Optical Detector / Phototransistor - QRD1114 Optical Detector / Phototransistor - QRD1114  This sensor uses an infrared emitted diode combined with an infrared phototransistor to detect the reflected infrared signal. Ideal for sensing black-to-white transitions or can be used to detect nearby objects (.5-1cm).Documents: QRD1114SFE Eagle Library has this part! $1.37
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    Light to Frequency Converter - TSL235R Light to Frequency Converter - TSL235R The TSL235R light-to-frequency converter outputs a square wave (50% duty cycle) with frequency directly proportional to light intensity (irradiance). The device has been temperature compensated for the ultraviolet-to-visible light range of 320 nm to 700 nm and responds over the light range of 320 nm to 1050 nm. The TSL235R can be... $2.95

    Ships in 3 to 7 days
    Infrared Proximity Sensor Long Range - Sharp GP2Y0A02YK0F Infrared Proximity Sensor Long Range - Sharp GP2Y0A02YK0F Infrared proximity sensor made by Sharp. Part # GP2Y0A02YK0F has an analog output that varies from 2.8V at 15cm to 0.4V at 150cm with a supply voltage between 4.5 and 5.5VDC. The sensor has a Japanese Solderless Terminal (JST) Connector. We recommend purchasing the related pigtail below or soldering wires directly to the back of the module. Thi... $16.50
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    Force Sensitive Resistor - Small Force Sensitive Resistor - Small This is a small force sensitive resistor. It has a 0.16" (4 mm) diameter active 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,... $5.95

    Ships in 3 to 7 days
    Non-Invasive Current Sensor - 30A Non-Invasive Current Sensor - 30A  Non-Invasive Current Sensor - 30Asku: SEN-11005 This non-invasive current sensor (also known as a "split core current transformer") can be clamped around the supply line of an electrical load to tell you how much current is passing through it. It does this by acting as an inductor and responding to the magnetic field around a current-carrying c... $11.25

    Ships in 24 hours
    Piezo Vibration Sensor - Large Piezo Vibration Sensor - Large This basic piezo sensor 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 ... $2.95
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    ACS712 Low Current Sensor Breakout ACS712 Low Current Sensor Breakout This current sensor gives precise current measurement for both AC and DC signals. These are good sensors for metering and measuring overall power consumption of systems. The ACS712 current sensor measures up to 5A of DC or AC current. We added an opamp gain stage for more sensitive current measurements. By adjusting the gain (from 4.27 to 47) yo... $9.95

    Ships in 24 hours
    Humidity and Temperature Sensor - SHT15 Breakout Humidity and Temperature Sensor - SHT15 Breakout This is a simple breakout board for the SHT15 humidity sensor from Sensirion. The SHT15 digital humidity and temperature sensor is fully calibrated and offers high precision and excellent long-term stability at low cost. The digital CMOSens Technology integrates two sensors and readout circuitry on one single chip. These sensors are really impr... $41.95

    Ships in 3 to 7 days
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