Humidity and Temperature Sensor - SHT15

This is a compact and easy to use relative 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 impressive! Very sensitive and straight forward to use.


  • Precise data logging
  • Transmitters
  • Automation & process control
  • Building control and HVAC
  • Test & Measurement
  • Medical
  • 2 factory calibrated sensors for relative humidity & temperature
  • Digital 2-wire interface
  • Precise dewpoint calculation possible
  • Measurement range: 0-100% RH
  • Absolute RH accuracy: +/- 2% RH (10...90% RH)
  • Repeatability RH: +/- 0.1% RH
  • Temp. accuracy: +/- 0.3°C @ 25°C
  • Fast response time < 4 sec.
  • Low power consumption (typ. 30 µW)
  • Low cost
  • High precision sensor at low cost
  • Leading CMOSens Technology for superior long-term stability

Humidity and Temperature Sensor - SHT15 Product Help and Resources

Core Skill: Soldering

This skill defines how difficult the soldering is on a particular product. It might be a couple simple solder joints, or require special reflow tools.

3 Soldering

Skill Level: Competent - You will encounter surface mount components and basic SMD soldering techniques are required.
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Core Skill: Programming

If a board needs code or communicates somehow, you're going to need to know how to program or interface with it. The programming skill is all about communication and code.

2 Programming

Skill Level: Rookie - You will need a better fundamental understand of what code is, and how it works. You will be using beginner-level software and development tools like Arduino. You will be dealing directly with code, but numerous examples and libraries are available. Sensors or shields will communicate with serial or TTL.
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Core Skill: Electrical Prototyping

If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.

3 Electrical Prototyping

Skill Level: Competent - You will be required to reference a datasheet or schematic to know how to use a component. Your knowledge of a datasheet will only require basic features like power requirements, pinouts, or communications type. Also, you may need a power supply that?s greater than 12V or more than 1A worth of current.
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Looking for answers to technical questions?

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  • Please indicate the max temp .

  • Member #8747 / about 17 years ago / 2

    Sensor works great. Only slight modification of code to work Arduino.

  • PBA / about 17 years ago / 2

    I liked this sensor for an environmental logging application I was working on. The amount of information and precision for the price can't be beat. I have found however that the time it takes to acclimate to a large temperature change (going from 75F to 45F) is slow. It took ~20min to settle when polling once a second and logging once a minute.

  • Member #353578 / about 11 years ago / 1

    could anyone knows how to code for CM-R humidity sensor using Arduino?,pls help me guys

  • ATtiny Fan / about 12 years ago / 1

    Forgiving me for being childish but I wonder how much time the manufacturer spent on naming the SHT series?

  • Member #223592 / about 12 years ago / 1

    Found this while searching for the cap...

  • Member #223592 / about 12 years ago / 1

    Found this while searching for the cap...

  • Member #223592 / about 12 years ago / 1

    Found this while searching for the cap...

  • Member #206403 / about 12 years ago / 1

    Ouch, does this unit really have a response time close to 4 seconds humidity I a fickle thing. Is there anything faster that is or isn't Arduino comparable possibly lab grade equip?

  • Blacklab1 / about 12 years ago * / 1

    I wish SparkFun would try out Sensirion's SHT21. Here's what Sensirion has to say about their SHT21 >>
    SHT21, the new humidity and temperature sensor of
    Sensirion is about to set new standards in terms of size
    and intelligence: Embedded in a reflow solderable Dual
    Flat No leads (DFN) package of 3 x 3mm foot print and
    1.1mm height it provides calibrated, linearized signals in
    digital, I2C format.
    With a completely new designed CMOSens® chip, a
    reworked capacitive type humidity sensor and an
    improved band gap temperature sensor the performance
    has been lifted even beyond the outstanding level of the
    previous sensor generation (SHT1x and SHT7x). For
    example, measures have been taken to stabilize the
    behavior at high humidity levels.
    Every sensor is individually calibrated and tested. Lot
    identification is printed on the sensor and an electronic
    identification code is stored on the chip – which can be
    read out by command. Furthermore, the resolution of
    SHT21 can be changed by command (8/12bit up to
    12/14bit for RH/T), low battery can be detected and a
    checksum helps to improve communication reliability.
    With made improvements and the miniaturization of the
    sensor the performance-to-price ratio has been improved
    – and eventually, any device should benefit from the
    cutting edge energy saving operation mode. For testing
    SHT21 a new evaluation Kit EK-H4 is available.

  • Member #235922 / about 12 years ago / 1

    is it possible to get the wet bulb temperature with this sensor?

    • Blacklab1 / about 12 years ago / 1

      You might want to take a look at the following >>
      Introduction to Humidity
      Basic Principles on Physics of Water Vapor >>
      Humidity at a Glance
      Most Relevant Equations with Sample Code >>
      There is one more but right now I cant find it.

  • Correct me if I'm wrong, but doesn't 2-wire interface imply I2C?
    Looking st the datasheet, this device can only communicate via SPI.

  • Isdale / about 13 years ago / 1

    Do you folks do the Reconditioning Procedure mentioned in the Sensirion data sheet (sect 1.4)?
    The schematic on the data sheet also notes a 100nF cap tween Vdd and gnd. I havent seen that on other schematics or boards although I did see a reference on other forums.
    I did see the Practical Arduino book has some code & library on the SHT series.

  • jonoxer / about 15 years ago / 1

    I've created an Arduino library to make it really easy to talk to SHT1x-series (SHT10, SHT11, SHT15) sensors. More information at

  • anttit / about 15 years ago / 1

    It would be nice, if SparkFun could also carry the SF1 filter cap for SHT1x. Just ordered a bunch from Farnell, which seems to be just about the only place who has them. Makes waterproofing so much easier.

    • UMBC-CheEng / about 13 years ago / 1

      Truly would be beneficial. Since Farnell doesn't have a US based office, would it be possible to maybe purchase one of these off of you through paypal. If we could work out some sort of international shipping arrangement :) We are going to use this sensor to enhance the accuracy of the alcohol gas sensor to determine the concentration of alcohol in the liquid phase from a vapor stream.

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