I found that Miles Burton stuff pretty clunky and I think you are proposing a mish-mash of it anyway. Here is something from Sheepdog that actually works. Strip out what you don't need, which is probably most of it. I only used it after a comedy of self-inflicted errors and, particularly since you are using two two sensors, you would be better off working with a one wire system, with the proper libraries, like God and Dallas intended. The time to make the change is probably now, before you waste too much of it, like I did......
/*
Reading two DS18B20s pins 14&15
display to monitor
display to LCD with pin D04 moved to pin 16 (A2)
Code uses Arduino LCD, sheepdog temp reader, SD stuff from Mellis & Igoe
*/
#define tture1 14//no ; here
#define tture2 15//no ; here
// include the library codes:
#include <LiquidCrystal.h>
#include <SD.h>
File myFile;
// initialize the library with the numbers of MY interface pins
LiquidCrystal lcd(8,9,16,5,6,7);
int HighByte, LowByte, TReading, SignBit, Tc_100, Whole, Fract;
void setup() {
//For each tture sensor: Do a pinMode and a digitalWrite
pinMode(tture1, INPUT);
pinMode(tture2, INPUT);
digitalWrite(tture1, LOW);//Disable internal pull-up.
digitalWrite(tture2, LOW);
Serial.begin(9600);
delay(300);//Wait for newly restarted system to stabilize
Serial.print("Temperature measurement, two sensors:\n\n");
// set up the LCD's number of columns and rows:
lcd.begin(16, 2);
lcd.clear();
// Print a message to the LCD.
lcd.print("temp in out");
Serial.print("Initializing SD card...");
pinMode(10, OUTPUT);
if (!SD.begin(4)) {
Serial.println("initialization failed!");
return;
}
Serial.println("initialization done.");
// open the file. note that only one file can be open at a time,
// so you have to close this one before opening another.
myFile = SD.open("test.txt", FILE_WRITE);//+++++++++++++++++++ OPEN
// if the file opened okay, write to it:
if (myFile) {
Serial.print("Writing to test.txt...");
myFile.println("testing! Did you forget the date?");
myFile.close();//++++++++++++++++++++++++++++++++++++++++++++ CLOSE
Serial.println("done.");
} else {
// if the file didn't open, print an error:
Serial.println("error opening test.txt");
}
}
void loop(){
// set the LCD cursor to column 4, line 1
// (note: line 1 is the second row, since counting begins with 0):
lcd.setCursor(4, 1);
readTture(tture1);//N.B.: Values passed back in globals
printTture();//N.B.: Takes values from globals. Also...
//no newline part of printTture;
delay(120);// Delay... must not be too short.
// set LCD cursor for second temp
lcd.setCursor(11, 1);
readTture(tture2);//Now read and report 2nd tture.
printTture();
delay(200);// Delay... must not be too short.
Serial.print("\n");//Start new line
myFile = SD.open("test.txt", FILE_WRITE);//+++++++++++++++++++++++++OPEN
myFile.println(", ");
myFile.close();//>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>CLOSE
delay(880);
}
//Everything below here... just copy it into your program "as is".
//You are only likely to need to use readTture(pin) and printTture()
// directly. Others are subordinate to those.
//These routine access the following global variables...
// int HighByte, LowByte, TReading, SignBit, Tc_100, Whole, Fract;
void OneWireReset(int Pin) // reset. Should improve to act as a presence pulse
{
digitalWrite(Pin, LOW);
pinMode(Pin, OUTPUT); // bring low for 500 us
delayMicroseconds(500);
pinMode(Pin, INPUT);
delayMicroseconds(500);
}
//end OneWireReset
void OneWireOutByte(int Pin, byte d) // output byte d (least sig bit first).
{
byte n;
for(n=8; n!=0; n--)
{
if ((d & 0x01) == 1) // test least sig bit
{
digitalWrite(Pin, LOW);
pinMode(Pin, OUTPUT);
delayMicroseconds(5);
pinMode(Pin, INPUT);
delayMicroseconds(60);
}
else
{
digitalWrite(Pin, LOW);
pinMode(Pin, OUTPUT);
delayMicroseconds(60);
pinMode(Pin, INPUT);
}
d=d>>1; // now the next bit is in the least sig bit position.
}
}//end OneWireOutByte
byte OneWireInByte(int Pin) // read byte, least sig byte first
{
byte d, n, b;
for (n=0; n<8; n++)
{
digitalWrite(Pin, LOW);
pinMode(Pin, OUTPUT);
delayMicroseconds(5);
pinMode(Pin, INPUT);
delayMicroseconds(5);
b = digitalRead(Pin);
delayMicroseconds(50);
d = (d >> 1) | (b<<7); // shift d to right and insert b in most sig bit position
}
return(d);
}//end OneWireInByte
void readTture(byte Pin){
//Pass WHICH pin you want to read in "Pin"
//Returns values in... (See global declarations)
OneWireReset(Pin);
OneWireOutByte(Pin, 0xcc);
OneWireOutByte(Pin, 0x44); // perform temperature conversion, strong pullup for one sec
OneWireReset(Pin);
OneWireOutByte(Pin, 0xcc);
OneWireOutByte(Pin, 0xbe);
LowByte = OneWireInByte(Pin);
HighByte = OneWireInByte(Pin);
TReading = (HighByte << 8) + LowByte;
SignBit = TReading & 0x8000; // test most sig bit
if (SignBit) // negative
{
TReading = (TReading ^ 0xffff) + 1; // 2's comp
}
Tc_100 = (6 * TReading) + TReading / 4; // multiply by (100 * 0.0625) or 6.25
Whole = Tc_100 / 100; // separate off the whole and fractional portions
Fract = Tc_100 % 100;
};//end readTture
void printTture(){//Uses values from global variables.
//See global declarations.
//N.B.: No new line inside printTture
myFile = SD.open("test.txt", FILE_WRITE); //+++++++++++++OPEN
if (SignBit) // If it's negative
{
Serial.print("-");
lcd.print("-");
myFile.print("-");
};
Serial.print(Whole);
Serial.print(".");
lcd.print(Whole);
lcd.print(".");
myFile.print(Whole);
myFile.print(".");
if (Fract < 10)
{
Serial.print("0");
lcd.print("0");
myFile.print("0");
};
Serial.print(Fract);
lcd.print(Fract);
myFile.print(Fract);
Serial.print(" ");
myFile.print(", ");
myFile.close();//++++++++++++++++++++++++ CLOSE
};//end printTture
