UKHeliBob:
Posting the code that errors and the full error messages would help.
the code is as follows:
/*
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.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;
void setup() {
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);
}
void loop() {
//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
=");
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:
unsigned int 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:
unsigned int readRegister(byte thisRegister, int bytesToRead ) {
byte inByte = 0; // incoming byte from the SPI
unsigned int 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);
}
AND THE ERROR MESSAGE IS :
Building for ArduPilot Mega 2.x
Excluding arduino core from include paths
F:\ardupilot\ArduPilot-Arduino-1.0.3-windows\hardware\tools\avr\bin\avr-g++ -c -g -Os -Wall -fno-exceptions -ffunction-sections -fdata-sections -mmcu=atmega2560 -DF_CPU=16000000L -MMD -DUSB_VID=null -DUSB_PID=null -DARDUINO=103 -mcall-prologues -DCONFIG_HAL_BOARD=HAL_BOARD_APM2 -DEXCLUDECORE -IF:\ardupilot\ArduPilot-Arduino-1.0.3-windows\libraries\SPI C:\Users\Sudhansu\AppData\Local\Temp\build994196272264057057.tmp\BarometricPressureSensor.cpp -o C:\Users\Sudhansu\AppData\Local\Temp\build994196272264057057.tmp\BarometricPressureSensor.cpp.o
In file included from BarometricPressureSensor.ino:26:
F:\ardupilot\ArduPilot-Arduino-1.0.3-windows\libraries\SPI/SPI.h:15:21: warning: Arduino.h: No such file or directory
In file included from BarometricPressureSensor.ino:26:
F:\ardupilot\ArduPilot-Arduino-1.0.3-windows\libraries\SPI/SPI.h:38: error: 'byte' does not name a type
F:\ardupilot\ArduPilot-Arduino-1.0.3-windows\libraries\SPI/SPI.h:55: error: 'byte' does not name a type
BarometricPressureSensor:32: error: 'byte' was not declared in this scope
BarometricPressureSensor:32: error: expected primary-expression before 'int'
BarometricPressureSensor:32: error: initializer expression list treated as compound expression
BarometricPressureSensor:33: error: variable or field 'writeRegister' declared void
BarometricPressureSensor:33: error: 'byte' was not declared in this scope
BarometricPressureSensor:33: error: 'byte' was not declared in this scope
BarometricPressureSensor:32: error: 'byte' does not name a type
BarometricPressureSensor:33: error: 'byte' does not name a type
BarometricPressureSensor.ino: In function 'void setup()':
BarometricPressureSensor:41: error: 'Serial' was not declared in this scope
BarometricPressureSensor:47: error: 'INPUT' was not declared in this scope
BarometricPressureSensor:47: error: 'pinMode' was not declared in this scope
BarometricPressureSensor:48: error: 'OUTPUT' was not declared in this scope
BarometricPressureSensor:51: error: 'writeRegister' was not declared in this scope
BarometricPressureSensor:55: error: 'delay' was not declared in this scope
BarometricPressureSensor.ino: In function 'void loop()':
BarometricPressureSensor:60: error: 'writeRegister' was not declared in this scope
BarometricPressureSensor:63: error: 'digitalRead' was not declared in this scope
BarometricPressureSensor:63: error: 'HIGH' was not declared in this scope
BarometricPressureSensor:65: error: 'readRegister' cannot be used as a function
BarometricPressureSensor:69: error: 'Serial' was not declared in this scope
BarometricPressureSensor:74: error: 'byte' was not declared in this scope
BarometricPressureSensor:74: error: expected `;' before 'pressure_data_high'
BarometricPressureSensor:75: error: 'pressure_data_high' was not declared in this scope
BarometricPressureSensor:78: error: 'readRegister' cannot be used as a function
BarometricPressureSensor:83: error: 'String' was not declared in this scope
BarometricPressureSensor.ino: At global scope:
BarometricPressureSensor:88: error: redefinition of 'unsigned int readRegister'
BarometricPressureSensor:32: error: 'unsigned int readRegister' previously defined here
BarometricPressureSensor:88: error: 'byte' was not declared in this scope
BarometricPressureSensor:88: error: expected primary-expression before 'int'
thanks