Need sample code interfacing Altimeter and Arduino SPI

danidub

Hello, I recently buy a Altimeter Module MS5607 (http://www.parallax.com/Store/Sensors/AccelerationTilt/tabid/172/ProductID/780/List/0/Default.aspx?SortField=ProductName,ProductName) and I need to interface it with my Arduino UNO with SPI protocol.

Any advice there, any sample code? I cant figure how to communicate with the module.

Thanks, Daniel P

John Abshier

All of the demo code that I have seen is for I2C. Arduino I2C code is at https://sites.google.com/site/parallaxinretailstores/home/altimeter-module-ms5607

John Abshier

danidub

John Abshier wrote: »

All of the demo code that I have seen is for I2C. Arduino I2C code is at https://sites.google.com/site/parallaxinretailstores/home/altimeter-module-ms5607

John Abshier

Hi John, thank you! I have already seen the I2C code, but I need to communicate with SPI.
Daniel P.

Franklin

What is it you are having trouble with? How are you connected and what code have you tried? are you sure you set the protocol line correctly?

danidub

Franklin wrote: »

What is it you are having trouble with? How are you connected and what code have you tried? are you sure you set the protocol line correctly?

Hello Franklin, the connection is ok, I follow the datasheet of the altimeter, but I have no code at all.
Thank you,
Daniel P.

Franklin

If you are looking for Arduino code I would recommend the arduino site. http://arduino.cc

danidub

Franklin wrote: »

If you are looking for Arduino code I would recommend the arduino site. http://arduino.cc

Thank you, but I have searched all over the internet and forums with no success for this module connected with SPI

Franklin

All you should need to do is send the text using SPI rather than I2C. It seems to be mostly ascii commands and returns.

danidub

Franklin, can you give me an idea of code for Arduino using SPI and this module (if you have some), I'm really new at this and sometimes it gets really complicated, or perhaps you can tell me the logic used in this communication for me to try some coding.
Thank you,
Daniel P.

Franklin

If you look at the intersemabaro.h file the places where there are Wire.write() lines are what needs to be sent to the baro and Wire.read() is where stuff is read from the baro.

danidub

Thank you Franklin! I'll try to code that! if succeed I'll post it here, have a nice day.
Daniel P

danidub

Hello, and here again!
I'm still trying and I made this code, that when a "0" is recieved in the serial, the arduino sends the conversion and read commands to the altimeter and stores the 24 bit data of the altitude. Till now, I get the data in three bytes, but for some reason I only get 3 bytes of 11111111, 11111111, 11111111.
I post the code:

/*
Circuit:
 SCK: pin 13
 MISO: pin 12
 MOSI: pin 11
 SS: pin 9
 */


const int ss = 9;
#include <SPI.h>


//3 bytes to get the 24 bit adc read
byte byte1; 
byte byte2; 
byte byte3;


void setup() {
  Serial.begin(9600);


  SPI.begin();
  SPI.setBitOrder(MSBFIRST);


  pinMode(ss, OUTPUT);
}


void loop() {


  if (Serial.available() > 0) {


    byte incomingByte = Serial.read();


    switch (incomingByte){
    case '0':
      read_alt();
      break;
    } //endswitch


  }//enif


}//endloop


void read_alt()
{
  //READ Altimeter
  digitalWrite(ss, LOW);
  SPI.transfer(0x50); //ADC conversion command
  delay(1);


  // and store read data into three bytes
  byte1 = SPI.transfer(0x00);//ADC conversion read command, first 8 bits
  byte2 = SPI.transfer(0x00);//ADC conversion read command, second 8 bits
  byte3 = SPI.transfer(0x00);//ADC conversion read command, third 8 bits


  //print the 3 bytes in serial
  Serial.println(byte1, BIN);
  Serial.println(byte2, BIN);
  Serial.println(byte3, BIN);
  Serial.println();


  //release chip, signal end transfer
  digitalWrite(ss, HIGH); 
}