Differential Pressure Sensor(±500pa) Wiki - DFRobot


This high-resolution differential pressure sensor with I2C communication is used to measure the difference in pressure across two points on a device. A high-performance MEMS pressure chip and a special conditioning chip are encapsulated inside the sensor. It will give you a comparative measurement between two points. Besides, the sensor IC adopts a unique multi-stage temperature-compensation algorithm to reduce the effect of environment on the output.

warning_yellow.png NOTE: In order to ensure the measurement resolution and the sensor life, please use the sensor in the clean air. Do not let water enter the nozzle of the sensor, or it will cause damage to the sensor.





Board Overview

SEN0343 Top View

Num Label Description
1 VCC Positive
2 GND Negative
3 SCL I2C data line
4 SDA I2C data line

IC Dimension

IC Size


  1. The unit for data above is mm. The true position tolerance is not marked. The size tolerance is ±0.05mm.
  2. Connect B to the pipe on the bottom of the sensor, T to the top. The top pipe T is defined as high pressure connection.



   * @brief Get sensor data of single measurement 
   * @return Data of struct type 
  sLwlp_t getData(void);

   * @brief filter processing function, get sensor data of filter processing 
   * @return Data of struct type 
  sLwlp_t getfilterData(void);

   * @brief Auto calibration differential pressure drift.
  void autoCorDrift();
   * @brief Manual calibration differential pressure drift.
   * @param drift
  void passiveCorDrift(float drift);

Connection Diagram


Sample Code 1- Data Measurement

 * @file readData.ino
 * @brief Read sensor pressure difference and temperature value
 * @copyright   Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
 * @licence     The MIT License (MIT)
 * @author [fengli](li.feng@dfrobot.com)
 * @version  V1.0
 * @date  2020-05-14
 * @get from https://www.dfrobot.com
 * @url https://github.com/DFRobot/DFRobot_LWLP
#include <DFRobot_LWLP.h>

 * @brief Construct the function
 * @param pWire IC bus pointer object and construction device, can both pass or not pass parameters, Wire in default.
 * @param address Chip IIC address, addresses 0x0 
DFRobot_LWLP lwlp;

void setup() {

  //Init chip 
  while (lwlp.begin() != 0) {
  Serial.println("Failed to initialize the chip, please confirm the chip connection");
  //Auto calibration differential pressure drift
  //Manual calibration differential pressure drift
  //lwlp.passiveCorDrift(/*Drift = */8.23);
void loop(void){
  DFRobot_LWLP::sLwlp_t data;
  //Get data of single measurement 
  data = lwlp.getData();
  //Get filter-processed data 
  //data = lwlp.getfilterData();
  //Get temperature in unit centigrade degree
  Serial.print("Temperature: ");
  Serial.println(" C");
  Serial.print("Differential Pressure: ");
  //Get pressure difference in unit pa 
  Serial.println(" pa");

Expected Results



For any questions, advice or cool ideas to share, please visit the DFRobot Forum.

More Documents

DFshopping_car1.png Get Differential Pressure Sensor ±500pa from DFRobot Store or DFRobot Distributor.

Turn to the Top