Differential Pressure Sensor(±500pa) Wiki

Introduction

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.

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.

Feature

Multi-stage temperature-compensation algorithm
I2C digital output
High resolution

Application

Home medical care equipment
Portable medical equipment
Medical monitoring
Industrial control
Central ventilation system

Specification

Operating Voltage: 3.3V~5V
Operating Range: ±500pa（±1.5%FS）
Operating Current: <5mA
Communication Mode: I2C
I2C Address: 0x00
Operating Temperature Range: -40℃~85℃
Temperature-compensation Range: -5℃~65℃
Dimension: 14.5×24mm/0.57×0.94”

SEN0343-Dimension

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

Note:

The unit for data above is mm. The true position tolerance is not marked. The size tolerance is ±0.05mm.
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.

Tutorial

Requirements

Hardware
- DFRduino UNO R3 (or similar) x 1
- LWLP Differential Pressure Sensor x1
- Wires
Software
- Arduino IDE
- Download and install the Differential Pressure Sensor Library. (About how to install the library?)
API Function List

 /**
   * @fn begin
   * @brief Initialize the function
   * @return Return 0 indicates a successful initialization, while other values indicates failure and return to error code.
   */
  int begin();
  /**
   * @fn getData
   * @brief Get sensor data of sigle measurement
   * @return Data of struct type 
   */
  sLwlp_t getData(void);
  /**
   * @fn getfilterData
   * @brief Filter processing funcition, get sensor data processed by this function 
   * @return Data of struct type 
   */
  sLwlp_t getfilterData(void);

Connection Diagram

SEN0343-Connection

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() {

  Serial.begin(9600);
  //Init Chip
  while (lwlp.begin() != 0) {
  Serial.println("Failed to initialize the chip, please confirm the chip connection");
  delay(1000);
  }
}
void loop(void){
  DFRobot_LWLP::sLwlp_t data;
  //Get data of single measurement 
  data = lwlp.getData();
  //Get data processed by the filter 
  //data = lwlp.getfilterData();
  //Get temperature in unit centigrade degree
  Serial.print("Temperature: ");
  Serial.print(data.temperature);
  Serial.println(" C");
  Serial.print("Differential Pressure: ");
  //Get pressure difference in unit pa 
  Serial.print(data.presure);
  Serial.println(" pa");
  delay(500);

}

Expected Results

SEN0343-Result

FAQ

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