/*
SCP1000 Barometric Pressure Sensor Display
Shows the output of a Barometric Pressure Sensor on a
Uses the SPI library. For details on the sensor, see:
http://www.sparkfun.com/commerce/product_info.php?products_id=8161
http://www.vti.fi/en/support/obsolete_products/pressure_sensors/
This sketch adapted from Nathan Seidle's SCP1000 example for PIC:
http://www.sparkfun.com/datasheets/Sensors/SCP1000-Testing.zip
Circuit:
SCP1000 sensor attached to pins 6, 7, 10 - 13:
DRDY: pin 6
CSB: pin 7
MOSI: pin 11
MISO: pin 12
SCK: pin 13
created 31 July 2010
modified 14 August 2010
by Tom Igoe
*/
// the sensor communicates using SPI, so include the library:
#include <SPI.h>
//Sensor's memory register addresses:
const int PRESSURE =0x1F; //3 most significant bits of pressure
const int PRESSURE_LSB =0x20;//16 least significant bits of pressure
const int TEMPERATURE =0x21;//16 bit temperature reading
const byte READ =0b11111100; // SCP1000's read command
const byte WRITE =0b00000010;// SCP1000's write command
// pins used for the connection with the sensor
// the other you need are controlled by the SPI library):
const int dataReadyPin =6;
const int chipSelectPin =7;
voidsetup(){
Serial.begin(9600);
// start the SPI library:
SPI.begin();
// initalize the data ready and chip select pins:
pinMode(dataReadyPin,INPUT);
pinMode(chipSelectPin,OUTPUT);
//Configure SCP1000 for low noise configuration:
writeRegister(0x02,0x2D);
writeRegister(0x01,0x03);
writeRegister(0x03,0x02);
// give the sensor time to set up:
delay(100);
}
voidloop(){
//Select High Resolution Mode
writeRegister(0x03,0x0A);
// don't do anything until the data ready pin is high:
if(digitalRead(dataReadyPin)==HIGH){
//Read the temperature data
int tempData = readRegister(0x21,2);
// convert the temperature to celsius and display it:
float realTemp =(float)tempData /20.0;
Serial.print("Temp[C]=");
Serial.print(realTemp);
//Read the pressure data highest 3 bits:
byte pressure_data_high = readRegister(0x1F,1);
pressure_data_high &=0b00000111;//you only needs bits 2 to 0
//Read the pressure data lower 16 bits:
unsignedint pressure_data_low = readRegister(0x20,2);
//combine the two parts into one 19-bit number:
long pressure =((pressure_data_high <<16)| pressure_data_low)/4;
// display the temperature:
Serial.println("\tPressure [Pa]="+ String(pressure));
}
}
//Read from or write to register from the SCP1000:
unsignedint readRegister(byte thisRegister,int bytesToRead){
byte inByte =0; // incoming byte from the SPI
unsignedint result =0;// result to return
Serial.print(thisRegister,BIN);
Serial.print("\t");
// SCP1000 expects the register name in the upper 6 bits
// of the byte. So shift the bits left by two bits:
thisRegister = thisRegister <<2;
// now combine the address and the command into one byte
byte dataToSend = thisRegister & READ;
Serial.println(thisRegister,BIN);
// take the chip select low to select the device:
digitalWrite(chipSelectPin,LOW);
// send the device the register you want to read:
SPI.transfer(dataToSend);
// send a value of 0 to read the first byte returned:
result = SPI.transfer(0x00);
// decrement the number of bytes left to read:
bytesToRead--;
// if you still have another byte to read:
if(bytesToRead >0){
// shift the first byte left, then get the second byte:
result = result <<8;
inByte = SPI.transfer(0x00);
// combine the byte you just got with the previous one:
result = result | inByte;
// decrement the number of bytes left to read:
bytesToRead--;
}
// take the chip select high to de-select:
digitalWrite(chipSelectPin,HIGH);
// return the result:
return(result);
}
//Sends a write command to SCP1000
void writeRegister(byte thisRegister,byte thisValue){
// SCP1000 expects the register address in the upper 6 bits
// of the byte. So shift the bits left by two bits:
thisRegister = thisRegister <<2;
// now combine the register address and the command into one byte:
byte dataToSend = thisRegister | WRITE;
// take the chip select low to select the device:
digitalWrite(chipSelectPin,LOW);
SPI.transfer(dataToSend);//Send register location
SPI.transfer(thisValue);//Send value to record into register
// take the chip select high to de-select:
digitalWrite(chipSelectPin,HIGH);
}