Modifying this multiple sensors onewire sketch :
http://www.arduino.cc/playground/Learning/OneWire
I would like to log 4 sensors (later write to SD card and send to the web).
The best would be for the logfile later the lines look like :
"temp1,temp2,temp3,temp4,date,time" - date and time will be here later if this code will be fine.
Now int the code sprintf() looks like:
sprintf(buf, "%d:%c%d.%d\337C ",sensor,SignBit ? '-' : '+', Whole, Fract < 10 ? 0 : Fract);
Serial.print(buf);
Please help how to modify the sketch from the current value.
full sketch at this point is:
#include <OneWire.h>
OneWire ds(3); // on pin 3
#define MAX_DS1820_SENSORS 4 //sensors max number
byte addr[MAX_DS1820_SENSORS][8];
void setup(void)
{
Serial.begin(9600);
Serial.print(F("DS1820 Test"));
if (!ds.search(addr[0]))
{
Serial.print(F("No more addresses."));
ds.reset_search();
delay(250);
return;
}
if ( !ds.search(addr[1]))
{
Serial.print(F("No more addresses."));
ds.reset_search();
delay(250);
return;
}
}
int HighByte, LowByte, TReading, SignBit, Tc_100, Whole, Fract;
char buf[20];
void loop(void)
{
byte i, sensor;
byte present = 0;
byte data[12];
for (sensor=0;sensor<MAX_DS1820_SENSORS;sensor++)
{
if ( OneWire::crc8( addr[sensor], 7) != addr[sensor][7])
{
Serial.print(F("CRC is not valid"));
return;
}
if ( addr[sensor][0] != 0x10)
{
Serial.print(F("Device is not a DS18S20 family device."));
return;
}
ds.reset();
ds.select(addr[sensor]);
ds.write(0x44,1); // start conversion, with parasite power on at the end
delay(1000); // maybe 750ms is enough, maybe not
// we might do a ds.depower() here, but the reset will take care of it.
present = ds.reset();
ds.select(addr[sensor]);
ds.write(0xBE); // Read Scratchpad
for ( i = 0; i < 9; i++)
{ // we need 9 bytes
data[i] = ds.read();
}
LowByte = data[0];
HighByte = data[1];
TReading = (HighByte << 8) + LowByte;
SignBit = TReading & 0x8000; // test most sig bit
if (SignBit) // negative
{
TReading = (TReading ^ 0xffff) + 1; // 2's comp
}
Tc_100 = (TReading*100/2);
Whole = Tc_100 / 100; // separate off the whole and fractional portions
Fract = Tc_100 % 100;
sprintf(buf, "%d:%c%d.%d\337C ",sensor,SignBit ? '-' : '+', Whole, Fract < 10 ? 0 : Fract);
// a little sprintf help:
//%% prints a single % (percent sign).
//%c prints a single character with the given ASCII number (66 is printed as B, for example).
//%s prints a given string
//%d a signed integer in decimal
//%u an unsigned (can't be negative) integer in decimal
//%o an unsigned integer in octal
//%x an unsigned integer in hexadecimal
//%e a floating point number in scientific notation
//%f a floating point number in fixed decimal notation
//%g same as %e or %f, whichever printf thinks is best.
//%X is the same as %x, except it uses upper-case letters
//%E like %e, but with an upper-case 'E'
//%G same as %E when scientific notation is used for the value.
//%p a pointer; it outputs Perl's value address in hexadecimal.
//%n an odd little bugger that *stores* (in the variable given for the position) the number of characters output so far.
Serial.print(buf);
}
}
Thanks!
