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Using an Arduino to read Honeywell ASDXRRX100PD2A5 I2C Pressure Sensor

Discussion in 'Sensors and Actuators' started by vivitern, Dec 27, 2017.

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  1. vivitern


    Dec 27, 2017
    I have a Honeywell ASDXRRX100PD2A5 I2C Pressure Sensor that I want to read using an Arduino.

    Looking at the datasheet, I know that the I2C address is 0x28, and I have had a play with bits of code I've found on the internet, but none of them make any sense. Numbers do increase as I increase the pressure, but not on the scale shown on the datasheet.

    I get it from Kynix. There is a lot of useful blogs on its site, which give me much help. Here I also want to share Kynix Semiconductor Electronic Blog

    Here is a link to said datasheet:

    Here is a datasheet that has information about communicating with Honeywell sensors using I2C:

    Without having much experience with I2C in the past it's hard for my to get my head around it.

    Also, here is a picture of my setup:


    The code I am using to test it out at the moment is as follows:

    #define sensor 0x28 //Unique bus address

    void setup()
    Wire.begin();//Wakes up I2C bus

    void getdata(byte *a, byte *b)
    //Move register pointer back to first register
    Wire.requestFrom(sensor,2);//Sends content of first two registers
    *a =; //first byte recieved stored here
    *b =; //second byte recieved stored here

    void showdata()
    byte aa,bb;
    float pressure =0;
    Serial.print("byte 1: ");Serial.println(aa,DEC);
    Serial.print("byte 2 ");Serial.println(bb,DEC);


    void loop()
    I am getting the following results at the following pressures:

    0psi byte1: 31
    byte2: 246

    10psi byte1: 34
    byte2: 102

    20psi byte1: 32
    byte2: 30

    30psi byte1: 39
    byte2: 167
    Any help pointing me in the right direction would be much appreciated.
  2. kellys_eye


    Jun 25, 2010
    Have you tried using another sensor to eliminate it as a potentially faulty device?
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