SD shield and SCP1000 Pressure/Temperature sensor problem...

Projects Programming
1

Dear Friends,

I am trying to log data from a SCP1000 PRESS/TEMP sensor into a file in a SD card, both included in an Arduino UNO setup . No matter what I try the SCP1000 and the SD-card don't work together (problems sharing the SPI bus).

I have browsed the web as well as the Arduino Forum looking for answers; so far, I've learned that other users have encountered the same problem. However, I haven't been able to learn if anyone found an effective solution as to be able to have the SD card and the SCP1000 sensor working together.

Your help, ideas, comments, are much appreciated.

Mountain Blue

2

Your help, ideas, comments, are much appreciated.

Your code would be a good starting point.

3

The following is the code for the

#include <SPI.h>
#include <SD.h>

/*
CONNECTIONS:

BAROMETRIC PRESSURE
D10 SCP1000: CSB (CHIP SELECT BAR)
D11 SCP1000: MOSI (DATA OUT)
D12 SCP1000: MISO (DATA IN)
D13 SCP1000: SCK (SPEED CLOCK)
GND GND
3.3V VCC+ (IMPORTANT: USES ONLY +3.3V)
*/

//USES THE SCP1000 PRESSURE/TEMPERATURE SENSOR
// define spi bus pins
#define SLAVESELECT 10
#define SPICLOCK 13
#define DATAOUT 11 //MOSI
#define DATAIN 12 //MISO

#define UBLB(a,b) ( ( (a) << 8) | (b) )
#define UBLB19(a,b) ( ( (a) << 16 ) | (b) )

//Addresses
#define REVID 0x00 //ASIC Revision Number
#define OPSTATUS 0x04 //Operation Status
#define STATUS 0x07 //ASIC Status
#define START 0x0A //Constant Readings
#define PRESSURE 0x1F //Pressure 3 MSB
#define PRESSURE_LSB 0x20 //Pressure 16 LSB
#define TEMP 0x21 //16 bit temp

//SD shield
// used as the CS pin, the hardware CS pin (10 on most Arduino boards,
// 53 on the Mega) must be left as an output or the SD library
// functions will not work.
const int chipSelect = 3;

void setup() {

// initialize Serial Port interface
Serial.begin(9600);

// INITIALIZATION OF THE SCP1000 PRESSURE PINS
byte clr;
pinMode(DATAOUT, OUTPUT);
pinMode(DATAIN, INPUT);
pinMode(SPICLOCK,OUTPUT);
pinMode(SLAVESELECT,OUTPUT);
digitalWrite(SLAVESELECT,HIGH); //disable device

SPCR = B01010011; //MPIE=0, SPE=1 (on), DORD=0 (MSB first), MSTR=1 (master), CPOL=0 (clock idle when low), CPHA=0 (samples MOSI on rising edge), SPR1=0 & SPR0=0 (500kHz)
clr=SPSR;
clr=SPDR;

//Initializes the SD card (code by Tom Igoe, from Public Domain)
Serial.print("Initializing SD card...\n");
// make sure that the default chip select pin is set to
// output, even if you don't use it:
pinMode(10, OUTPUT);

// INITIALIZATION OF THE SD CARD
// see if the card is present and can be initialized:

if (!SD.begin(chipSelect)) {
Serial.println("Card failed, or not present");
// don't do anything more:
return;
}

delay(10);

//Serial.println("Initialize High Speed Constant Reading Mode");
write_register(0x03,0x09);
}