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Gravity: Analog Water Pressure Sensor

SKU: SEN0257

This is the DFRobot Gravity SEN0257 Analog Water Pressure Sensor, featuring a 3-pin Gravity interface. It supports 5V input and 0.5~4.5V linear voltage output, compatible with Arduino controllers. With the Gravity IO Expansion Shield, it plugs into Arduino wiring-free. It helps diagnose water presence and pressure, ideal for smart home, IoT, and device detection. Pair with other sensors (e.g., solenoid valve) to build smart water control systems.

Front of cylindrical water pressure sensor with black cable and connector.-DFRobot product sku:SEN0257 image.
  • Docs
  • Tech Specs

    • 1. Example Code for Arduino-Read Water Pressure Value

    This article explains how to use Arduino to measure water pressure with a sensor, covering hardware setup, calibration, and providing a sample code to accurately read pressure values from the sensor.

    2. Example Code for Arduino-DIY Water Pressure Detector

    This article offers a detailed guide on building a DIY water pressure detector using Arduino, including necessary hardware, software, wiring diagrams, and sample code for calibration and measurement.

    Reference

    This article explores the piezoresistive effect and strain gauge sensors, emphasizing the role of monocrystallinesilicon in sensor response to force and resistivity changes, and details the construction and application of these sensors in pressure transmitters through IC engineering technology.

    Specification

    Parameter Value
    Medium liquid/gas without corrosion
    Wiring Gravity-3Pin (Signal-VCC-GND)
    Pressure Measurement Range 0~1.6 Mpa
    Input Voltage +5 VDC
    Output Voltage 0.5~4.5 V
    Measurement Accuracy 0.5%~1%FS (0.5%, 0~55°C)
    Threadably G1/4
    Adapter G1/2 to G1/4
    Waterproof Level IP68
    Operating Temperature -20~85°C
    Response Time <2.0 ms
    Quiescent Current 2.8 mA
    Normal Operating Pressure ≤2.0 Mpa
    Damaged Pressure ≥3.0 Mpa
    Service Life ≥10’000’000 times (10 million)

    PinOut

    SEN0257 PinOut-Water Preessure Sensor

    Label Name Description
    Yellow Signal(Output:0.5~4.5V) Analog Signal
    Red VCC(5VDC) +
    Black GND -

    FAQ

    • Can I extend/shorten the sensor wiring by myself?

      Yes you can. However, please use a high quality extension cord, too long or poor quality wire may cause partial pressure, resulting in inaccurate sensor reading.

    • Are these pressure transducers available in any other pressure ranges? I bought two of these for my pool and stupidly forgot to check the pressure range. The pool only operates at about 200Kpa but the sensor shown is rated at 2Mpa so I'll only be able to use about 10% of the full scale reading. I can use them, but I'd obviously get better resolution from an appropriately rated transducer.

      So, are any other pressure ranges available?

      I see that the pressure sensor is IP68 rated. Is this applicable for the whole sensor or only the front threaded section?
      (I need to submerged the sensor - if not fully ip68 rated I need to seal it completely, except for the front threaded side)

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