I am trying to get the readings from a DS18B20 graphed by Processing, but I can only find examples that use analogue sensors. For the Arduino, I am using this code: http://bildr.org/2011/07/ds18b20-arduino/
Basically, this is what I would like to do:
http://community.cosm.com/arduino/usb/processing#pachube-input
but I will settle for a simple graph for the moment
(Complete rookie, help is appreciated. Sorry if this is the wrong forum.)
Guttemann:
I am trying to get the readings from a DS18B20 graphed by Processing, but I can only find examples that use analogue sensors. For the Arduino, I am using this code: http://bildr.org/2011/07/ds18b20-arduino/
I remember that stuff and was singularly unimpressed but I note that you specifically say "a DS18B20" so, if you have it working, with a result on the monitor, it will suffice for now. If not, you might find the code below useful. It is derived from Hacktronics q.v.
Basically, this is what I would like to do:
http://community.cosm.com/arduino/usb/processing#pachube-input
I believe this is all out of date and should be studiously avoided. Assuming you are using a W5100 Ethernet shield, check the cosm site and make sure you get the latest libraries cosm.h and HttpClient.h. If you don't have an ethernet shield yet, make sure you get a W5100. If you have an enc28 ethernet, it is possible to use it on cosm but you will have a harder time with it. There is recent discussion around on that.
but I will settle for a simple graph for the moment
You might find PLX-DAQ useful. It is an Excel macro that gives a local real time graph. It isn't made with Arduino in mind but it is easily adapted, being merely a matter of formatting. This is shown in the code.
/*
// This Arduino sketch reads DS18B20 "1-Wire" digital
// temperature sensors.
// Copyright (c) 2010 Mark McComb, hacktronics LLC
// Tutorial:
// http://www.hacktronics.com/Tutorials/arduino-1-wire-tutorial.html
// code uses Arduino LCD stuff, for shield on Freetronics EtherTen.
// Serial print commands are for PLX-DAQ
*/
#include <OneWire.h>
#include <DallasTemperature.h>
#include <SPI.h>
#include <Ethernet.h>
#include <LiquidCrystal.h>
#include <SD.h>
// These three are required to create the filename
#include <string.h>
#include "RTClib.h"
RTC_DS1307 RTC;
File myFile;
char filename[] = "00000000.CSV";
#include "Wire.h"
#define DS1307_ADDRESS 0x68
LiquidCrystal lcd(8,9,16,5,6,7);
byte InThermo[8] = {
0x28, 0x69, 0xC2, 0xB0, 0x03, 0x00, 0x00, 0X9F};
byte OutThermo[8] = {
0x28, 0x7A, 0x8B, 0xC0, 0x03, 0x00, 0x00, 0x2F};
byte DrainThermo[8] = {
0x28, 0x09, 0xA9, 0xC0, 0x03, 0x00, 0x00, 0x95};
#define ONE_WIRE_BUS 3
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
int second, minute, hour, weekDay, monthDay, month, year;
int k=0;
float InTemp, OutTemp, DrainTemp; // used for SD write only
// Define the strings for our datastream IDs
char sensorId0[] = "InThermo";
char sensorId1[] = "OutThermo";
char sensorId2[] = "DrainThermo";
char calcId1[] = "diff";
void setup() {
lcd.begin(16, 2);
Wire.begin();
Serial.begin(9600);
Serial.print(" filename ");
delay(300);//Wait for newly restarted system to stabilize
lcd.setCursor (0,0);
lcd.print("Initializing SD");
delay(2000);
lcd.setCursor (0,1);
pinMode(10, OUTPUT);
if (!SD.begin(4)) {
Serial.println("init. failed!");
return;
}
lcd.print("init. OK");
delay(2000);
getFileName();
Serial.println(filename);
lcd.clear();
Serial.println("LABEL,Time,InTemp,OutTemp,diff,DrainTemp");
sensors.setResolution(InThermo, 12);
sensors.setResolution(OutThermo, 12);
sensors.setResolution(DrainThermo, 12);
}
void loop() {
GetClock();
myFile = SD.open(filename, FILE_WRITE);//<<<<<<<<<<<<< OPEN
if (hour == 0 && minute == 0 && second <2)
{
getFileName();
}
Serial.print("DATA,TIME, ");
Serial.print(monthDay);
Serial.print("/");
Serial.print(month);
Serial.print("/");
Serial.print(year);
Serial.print(" ");
Serial.print(hour);
Serial.print(":");
Serial.print(minute);
Serial.print(":");
if ((second) < 10)
{
Serial.print("0");
};
Serial.print(second);
Serial.print(" ");
int ret=0;
//get the values from the DS8B20's
sensors.requestTemperatures();
float InTemp = (sensorValue(InThermo));
float OutTemp = (sensorValue(OutThermo));
float DrainTemp = (sensorValue(DrainThermo));
float diff = OutTemp - InTemp;
Serial.print(InTemp);
Serial.print(" , ");
Serial.print(OutTemp);
Serial.print(" , ");
Serial.print(DrainTemp);
Serial.println(" , ");
lcd.setCursor (0,0);
lcd.print(InTemp);
lcd.setCursor (11,0);
lcd.print (OutTemp);
lcd.setCursor(0,1);
lcd.print(diff);
lcd.print(" ");
lcd.setCursor(11,1);
lcd.print(DrainTemp);
k=k+1;
if (k>9 )
{
myFile.print(monthDay);
myFile.print("/");
myFile.print(month);
myFile.print("/");
myFile.print(year);
myFile.print(", ");
myFile.print(hour);
myFile.print(":");
myFile.print(minute);
myFile.print(":");
myFile.print(second);
myFile.print(", ");
myFile.print(InTemp);
myFile.print(", ");
myFile.print(OutTemp);
myFile.print(", ");
myFile.print(DrainTemp);
myFile.print(", ");
k=0;
}
myFile.close();//>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>CLOSE
delay(850);
} // loop ends here
//sensorValue function
float sensorValue (byte deviceAddress[])
{
float tempC = sensors.getTempC (deviceAddress);
return tempC;
}
byte bcdToDec(byte val) {
// Convert binary coded decimal to normal decimal numbers
return ( (val/16*10) + (val%16) );
}
void GetClock(){
// Reset the register pointer
Wire.beginTransmission(DS1307_ADDRESS);
byte zero = 0x00;
Wire.write(zero);
Wire.endTransmission();
Wire.requestFrom(DS1307_ADDRESS, 7);
second = bcdToDec(Wire.read());
minute = bcdToDec(Wire.read());
hour = bcdToDec(Wire.read() & 0b111111); //24 hour time
weekDay = bcdToDec(Wire.read()); //0-6 -> sunday - Saturday
monthDay = bcdToDec(Wire.read());
month = bcdToDec(Wire.read());
year = bcdToDec(Wire.read());
}
void getFileName(){
DateTime now = RTC.now();
filename[0] = (now.year()/1000)%10 + '0'; //To get 1st digit from year()
filename[1] = (now.year()/100)%10 + '0'; //To get 2nd digit from year()
filename[2] = (now.year()/10)%10 + '0'; //To get 3rd digit from year()
filename[3] = now.year()%10 + '0'; //To get 4th digit from year()
filename[4] = now.month()/10 + '0'; //To get 1st digit from month()
filename[5] = now.month()%10 + '0'; //To get 2nd digit from month()
filename[6] = now.day()/10 + '0'; //To get 1st digit from day()
filename[7] = now.day()%10 + '0'; //To get 2nd digit from day()
myFile = SD.open(filename, FILE_WRITE);
myFile.close();
}
Yes, the sensor is giving me readings.
I do not have an ethernet shield. Is all this hard to achieve through USB?
Guttemann:
Is all this hard to achieve through USB?
If I understand you correctly, you are talking about collecting the serial data and sending that to cosm from the networked PC, i.e. the Arduino is merely an interface with the sensor, rather than a stand-alone device that communicates with cosm directly.
I know nothing about that but I'm sure it is possible and I believe I saw some mention about it on the cosm forum quite recently. You should try there.