Wiring Sensirion i2C Air Flow Digital Differential Pressure Sensor

This is the SDP (Sensirion Differential Sensor) a series of digital differential pressure sensors suitable for high volume applications. This sensor measure the pressure of air and non-aggressive gases with advance accuracy and no offset drift. This series of sensors cover a pressure range up to ±5,00 Pa (±2 inch H2O / ±5 mbar) and deliver outstanding accuracy and also the bottom end of the measuring range.

The SDP sensor features a digital i2c / TWI (two wire interface, which make it easy to connect directly to your microcontroller, or microprocessor. The outstanding performance of these sensors is based on patented Sensirion’s CMOSense sensor technology, which combines the sensor element signal processing and digital calibration on a small CMOS chip. The differential pressure is measured by thermal sensor element using flow-through technology. This device is suitable for used in Medical/Clinical Devices, HVAC (Heating Ventilating Air Conditioning), Smart Energy, Gas Boilers, Gas Ovens, Pellet Stoves, Thermostats, Filter Monitor, Clean Room, Fume Hoods, Fuel Cells, VAC Control, Building Automations, Industrial and Automotive. For further readings please refer to the datasheet below.

Required Components

Arduino IDE | Atmel Studio | STM32CubeMX | Energia
Microcontroller – Arduino, NodeMCU, Teensy Board, TeensyDuino, ESP8266 12, 12E, ESP32, LinkItOne, ESP8266 NodeMCU, ESPDuino, ATMEGA328 16/12, ATMEGA32u4 16/8/ MHz, ESP8266, MSP430 ,ATMEGA250 16 MHz, ATSAM3x8E, ATSAM21D, ATTINY85 16/8 MHz, STM32 Nucleo, Discovery kits and Evaluation boards Note: The Diagram below is using NANO. (please refer to each MCU’s respective pin-outs & bus configurations)
Sensirion Differential Sensor
Capacitors (See below required values)
Resistors (See below required values)
Jumper Wire (Optional)
Prototyping Board (Optional)

Wiring Guide

Source Code for Continuous Reading

//#include <Arduino.h>
#include "SDP.h"
#include "Wire.h"

SDP_Controller SDP800;

/* 
This code is tested on SDP810 but works on 
SDP31 (500Pa), SDP32 (125Pa), SDP800 - 500Pa, SDP800 - 125Pa
SDP810 - 500Pa, SDP810 > 125Pa
*/

double DP, TMP; 
uint32_t prevMillis = 0;

void setup(){

  while(!Serial){
  Serial.begin(115200); //If serial is available 
}
  Serial.println("14CORE | Digital Differential Pressure Sensor Test Code");
  Serial.orintln("Initializing...........................................");
  delay(4000);
  SDP_timer.begin(SDP_isr,250000); // 1000Hz
  Wire.begin();
  SDP800.begin();
  SDP800.getAddress();
  SDP800.startContinuousMeasurement(SDP_TEMPCOMP_DIFFERENTIAL_PRESSURE, SDP_AVERAGING_TILL_READ);
}

void loop(){
  //set to read at 100Hz
  if((millis() - prevMillis) > 10){
    DP = SDP800.getDiffPressure();
    TMP = SDP800.getTemperature(); //
    Serial.println(DP);
    Serial.println(TMP);
  }
  delay(1000)
}

//#include <Arduino.h>

#include "SDP.h"

#include "Wire.h"

SDP_Controller SDP800;

This code is tested on SDP810 but works on

SDP31 (500Pa), SDP32 (125Pa), SDP800 - 500Pa, SDP800 - 125Pa

SDP810 - 500Pa, SDP810 > 125Pa

double DP, TMP;

uint32_t prevMillis = 0;

void setup(){

while(!Serial){

Serial.begin(115200); //If serial is available

}

Serial.println("14CORE | Digital Differential Pressure Sensor Test Code");

Serial.orintln("Initializing...........................................");

delay(4000);

SDP_timer.begin(SDP_isr,250000); // 1000Hz

Wire.begin();

SDP800.begin();

SDP800.getAddress();

SDP800.startContinuousMeasurement(SDP_TEMPCOMP_DIFFERENTIAL_PRESSURE, SDP_AVERAGING_TILL_READ);

}

void loop(){

//set to read at 100Hz

if((millis() - prevMillis) > 10){

DP = SDP800.getDiffPressure();

TMP = SDP800.getTemperature(); //

Serial.println(DP);

Serial.println(TMP);

}

delay(1000)

}

Source Code for Interrupt

//#include <Arduino.h>
#include "SDP.h"
#include "Wire.h"

#define IRQ_PIN 2

SDP_Controller SDP800;

/* 
This code is tested on SDP810 but works on 
SDP31 (500Pa), SDP32 (125Pa), SDP800 - 500Pa, SDP800 - 125Pa
SDP810 - 500Pa, SDP810 > 125Pa
*/

double DP, TMP;
bool senseFlags = false;

void setup(){

  while(!Serial){
  Serial.begin(115200);
}

  Serial.println("14CORE | Digital Differential Pressure Sensor Test Code");
  Serial.println("Initializing...........................................");
  delay(4000);
  pinMode(IRQ_PIN, INPUT_PULLUP);
  attachInterrupt(IRQ_PIN, sdpISR, FALLING); // Interrupt set to active when low

  Wire.begin();
  SDP800.begin();
  SDP800.getAddress();
  SDP800.startContinuousMeasurement(SDP_TEMPCOMP_DIFFERENTIAL_PRESSURE, SDP_AVERAGING_TILL_READ);
}

void loop(){

  if(senseFlags == true){
    DP = SDP800.getDiffPressure();
    TMP = SDP800.getTemperature();
    senseFlags = false;
    Serial.println(DP);
    Serial.println(TMP);
  }

}

//function interrupt routine
void sdpISR(void){
  senseFlags = true;
}

//#include <Arduino.h>

#include "SDP.h"

#include "Wire.h"

#define IRQ_PIN 2

SDP_Controller SDP800;

This code is tested on SDP810 but works on

SDP31 (500Pa), SDP32 (125Pa), SDP800 - 500Pa, SDP800 - 125Pa

SDP810 - 500Pa, SDP810 > 125Pa

double DP, TMP;

bool senseFlags = false;

void setup(){

while(!Serial){

Serial.begin(115200);

}

Serial.println("14CORE | Digital Differential Pressure Sensor Test Code");

Serial.println("Initializing...........................................");

delay(4000);

pinMode(IRQ_PIN, INPUT_PULLUP);

attachInterrupt(IRQ_PIN, sdpISR, FALLING); // Interrupt set to active when low

Wire.begin();

SDP800.begin();

SDP800.getAddress();

SDP800.startContinuousMeasurement(SDP_TEMPCOMP_DIFFERENTIAL_PRESSURE, SDP_AVERAGING_TILL_READ);

}

void loop(){

if(senseFlags == true){

DP = SDP800.getDiffPressure();

TMP = SDP800.getTemperature();

senseFlags = false;

Serial.println(DP);

Serial.println(TMP);

}

//function interrupt routine

void sdpISR(void){

senseFlags = true;

}

Source Code for Triggered Reading

//#include <Arduino.h>
#include "SDP.h"
#include "Wire.h"

SDP_Controller SDP800;

float DPS, TMP;
uint32_t prevMillis = 0;

void setup(){

  while(!Serial){
    Serial.begin(115200); //If serial is available 
  }
    Serial.orintln("Initializing...........................................");
    delay(4000);

  Wire.begin();
  SDP800.begin();
  SDP800.startContinuousMeasurement(SDP_TEMPCOMP_DIFFERENTIAL_PRESSURE, SDP_AVERAGING_TILL_READ);
}

void loop(){
  // reading at 100Hz
  if((millis() - prevMillis) > 10){
    // Trigger measurement with differential pressure temperature compensation and without clock stretching
    DPS = SDP800.getDiffPressureTrigger(SDP_TEMPCOMP_DIFFERENTIAL_PRESSURE, SDP_CLKST_NONE);
    TMP = SDP800.getTemperature();
  }

}

//#include <Arduino.h>

#include "SDP.h"

#include "Wire.h"

SDP_Controller SDP800;

float DPS, TMP;

uint32_t prevMillis = 0;

void setup(){

while(!Serial){

Serial.begin(115200); //If serial is available

}

Serial.orintln("Initializing...........................................");

delay(4000);

Wire.begin();

SDP800.begin();

SDP800.startContinuousMeasurement(SDP_TEMPCOMP_DIFFERENTIAL_PRESSURE, SDP_AVERAGING_TILL_READ);

}

void loop(){

// reading at 100Hz

if((millis() - prevMillis) > 10){

// Trigger measurement with differential pressure temperature compensation and without clock stretching

DPS = SDP800.getDiffPressureTrigger(SDP_TEMPCOMP_DIFFERENTIAL_PRESSURE, SDP_CLKST_NONE);

TMP = SDP800.getTemperature();

}

Downloads

Wiring Sensirion i2C Air Flow Digital Differential Pressure Sensor

7 thoughts on “Wiring Sensirion i2C Air Flow Digital Differential Pressure Sensor”

Jaco Slabbert
at

Raspberry pi Python code is available at https://github.com/JJSlabbert/Sensirion_SDP810
Millen
at

Hey, just letting you know there is a typo with one of the Serial.println codes. Also, it seems the SDP.h library doesn’t work
- 14core EditorPost author
  at
  
  Ok, try this https://www.14core.com/wp-content/uploads/2018/11/SDP6x.zip library.
krishna deva
at

hey, I’ve just uploaded the SDP8xx library file in arduino V1.8.8 and compiled the code but i’m getting
ERROR : fatal error: cstdint: No such file or directory
please help me to solve it. Thank you
krishna deva
at

Hey,I’ve tried the above code for SDP8xx in Arduino IDE. The error was showing at included library, seems cstdint was not found in any directory, kindly help me to solve it. Thank you
- Ege
  at
  
  hello, could you find a solution for it? I am also getting the same error. Thanks…
Ege
at

hello, could you find a solution for it? I am also getting the same error. Thanks…

Required Components

Wiring Guide

Source Code for Continuous Reading

Source Code for Interrupt

Source Code for Triggered Reading

Downloads

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7 thoughts on “Wiring Sensirion i2C Air Flow Digital Differential Pressure Sensor”

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