Example Code for Arduino-Read Sensor Data via I2C

Hardware Preparation

• DFRuino UNO R3 x1: Purchase Link
• SEN0456 Gravity: I2C MPX5700AP Air Pressure Sensor(15-700kPa) x1:
• DuPont Wires

Software Preparation

• Arduino IDE: Download Link
• DFRobot_MPX5700 Library: Download Link. (About how to install the library?)

Wiring Diagram

Other Preparation Work

• Connect the module to Arduino by the connection diagram above. You can certainly use with Gravity I/O to complete the project prototype in a more convenient and faster way.
• The I2C address defaults to 0x16, corresponding to the ADDRESS_0 in the code. If you need to modify the I2C address, you can first configure the hardware I2C address via the dial-up switch on the module, and modify the definition ADDRESS_X of the I2C address in the sample code. The correspondence between the dial switch and the I2C address parameter is as follows:
  • ADDRESS_0：0x16, A0=0, A1=0
  • ADDRESS_1：0x17, A0=1, A1=0
  • ADDRESS_2：0x18, A0=0, A1=1
  • ADDRESS_3：0x19, A0=1, A1=1
• Download and install DFRobot_MPX5700 library. (About how to install the library?)
• Open the Arduino IDE, prepare to upload the program.

Sample Code

/*!
  * @file  getPressureValue.ino
    @n i2c Address select, default I2C address to 0x16, the A1 and A0 combines 4 IIC addresses. 
                | A1 | A0 |
                | 0  | 0  |    0x16
                | 0  | 1  |    0x17
                | 1  | 0  |    0x18
                | 1  | 1  |    0x19   default i2c address  
  * @n Phenomenon: serial print all data 
*/
#include "DFRobot_MPX5700.h"
#define I2C_ADDRESS 0x16
DFRobot_MPX5700  mpx5700(&Wire, I2C_ADDRESS);
void setup()
{
  Serial.begin(115200);
  while (false == mpx5700.begin())
  {
    Serial.println("i2c begin fail,please chack connect!");
    delay(1000);
  }
  Serial.println("i2c begin success");

/*
 *For smoothing data, it is necessary to set to obtain the average value of xx(quantity)data abc.  
 *If it is not set, the system will automatically get the average value of 5 samples. 
 */
  mpx5700.setMeanSampleSize(/*Sample Quantity*/5);
}

void loop()
{
  Serial.print("Pressure Value: ");
/*
 *Get the ambient air pressure. Can set whether to enable calibration.
 *1：Enable calibration 
 *0：Not 
 */
  Serial.print(mpx5700.getPressureValue_kpa(1));
  Serial.println(" kpa");
  delay(1000);
}

Result

Open the serial port monitor to get the final data.

Additional Information

You can certainly use with Gravity I/O to complete the project prototype in a more convenient and faster way.