DS18B20 temperature sensor problem

Projects Programming
1

i have 2 18B20 temp sensors ...

Found '1-Wire' device with address:
0x28, 0xC2, 0x39, 0x77, 0x03, 0x00, 0x00, 0x52
Found '1-Wire' device with address:
0x28, 0x3F, 0x2B, 0x77, 0x03, 0x00, 0x00, 0x95

1 HD74480 LCD and an arduino uno

i can make each of them work seperatly (lcd hello world and 18B20 read temp through serial monitor)

i cant get it to work together.
here is the code im using...

// This Arduino sketch reads DS18B20 "1-Wire" digital
// temperature sensors.
// Tutorial:
// Arduino 1-Wire Tutorial

#include <OneWire.h>
#include <DallasTemperature.h>
#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 10, 5, 4, 3, 2);

int backLight = 13; // pin 13 will control the backlight

// Data wire is plugged into pin 8 on the Arduino
#define ONE_WIRE_BUS 8

// Setup a oneWire instance to communicate with any OneWire devices
OneWire oneWire(ONE_WIRE_BUS);

// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);

// Assign the addresses of your 1-Wire temp sensors.
// See the tutorial on how to obtain these addresses:
// Arduino 1-Wire Address Finder

DeviceAddress insideThermometer = { 0x28, 0xC2, 0x39, 0x77, 0x03, 0x00, 0x00, 0x52 };
DeviceAddress outsideThermometer = { 0x28, 0x3F, 0x2B, 0x77, 0x03, 0x00, 0x00, 0x95 };

void setup(void)
{
// Start up the library
sensors.begin();
// set the resolution to 10 bit (good enough?)
sensors.setResolution(insideThermometer, 10);
sensors.setResolution(outsideThermometer, 10);

pinMode(backLight, OUTPUT);
digitalWrite(backLight, HIGH); // turn backlight on. Replace 'HIGH' with 'LOW' to turn it off.
lcd.begin(16,2); // columns, rows. use 16,2 for a 16x2 LCD, etc.
lcd.clear(); // start with a blank screen
}

void printTemperature(DeviceAddress deviceAddress)
{
float tempC = sensors.getTempC();
if (tempC == -127.00) {
lcd.print("Error");
} else {
lcd.print(tempC);
lcd.print("/");
lcd.print(DallasTemperature::toFahrenheit(tempC));
}
}

void loop(void)
{
delay(2000);
sensors.requestTemperatures();
lcd.setCursor(0,0);
lcd.print("In: ");
printTemperature(insideThermometer);
lcd.setCursor(0,1);
lcd.print("Out: ");
printTemperature(outsideThermometer);
}

this is the error im getting

sketch_oct13a:7: error: variable or field 'printTemperature' declared void
sketch_oct13a:7: error: 'DeviceAddress' was not declared in this scope
sketch_oct13a:20: error: no matching function for call to 'DallasTemperature::DallasTemperature(OneWire*)'
C:\Users\Chad\Downloads\arduino-0023\arduino-0023\libraries\DallasTemperature/DallasTemperature.h:48: note: candidates are: DallasTemperature::DallasTemperature(NewOneWire&, uint8_t, StratBase*)
C:\Users\Chad\Downloads\arduino-0023\arduino-0023\libraries\DallasTemperature/DallasTemperature.h:20: note: DallasTemperature::DallasTemperature(const DallasTemperature&)
sketch_oct13a:26: error: 'DeviceAddress' does not name a type
sketch_oct13a:27: error: 'DeviceAddress' does not name a type
sketch_oct13a.cpp: In function 'void setup()':
sketch_oct13a:34: error: 'class DallasTemperature' has no member named 'setResolution'
sketch_oct13a:34: error: 'insideThermometer' was not declared in this scope
sketch_oct13a:35: error: 'class DallasTemperature' has no member named 'setResolution'
sketch_oct13a:35: error: 'outsideThermometer' was not declared in this scope
sketch_oct13a.cpp: At global scope:
sketch_oct13a:43: error: variable or field 'printTemperature' declared void
sketch_oct13a:43: error: 'DeviceAddress' was not declared in this scope

any guidance is appreciated.

please dont do the " just use the search function of the forum" i already have as well as crawled all over the net searching before i posted.

2

What version of the IDE are you using? If it is 1.0.1, try compiling that code on 1.0, and show the messages from that.

3

ok started over with the programming. now im using ...

// LCD Thermostat
// www.hacktronics.com

#include <OneWire.h>
#include <LiquidCrystal.h>

// Connections:
// rs (LCD pin 4) to Arduino pin 12
// rw (LCD pin 5) to Arduino pin 11
// enable (LCD pin 6) to Arduino pin 10
// LCD pin 15 to Arduino pin 13
// LCD pins d4, d5, d6, d7 to Arduino pins 5, 4, 3, 2
LiquidCrystal lcd(12, 11, 10, 5, 4, 3, 2);
int backLight = 13; // pin 13 will control the backlight

OneWire ds(8); // ds18b20 pin #2 (middle pin) to Arduino pin 8

byte i;
byte present = 0;
byte data[12];
byte addr[8];

int HighByte, LowByte, SignBit, Whole, Fract, TReading, Tc_100, FWhole;

void setup(void) {
pinMode(backLight, OUTPUT);
digitalWrite(backLight, HIGH); // turn backlight on. Replace 'HIGH' with 'LOW' to turn it off.
lcd.begin(2,16); // rows, columns. use 2,16 for a 2x16 LCD, etc.
lcd.clear(); // start with a blank screen
lcd.setCursor(0,0); // set cursor to column 0, row 0

if ( !ds.search(addr)) {
lcd.clear(); lcd.print("No more addrs");
delay(1000);
ds.reset_search();
return;
}

if ( OneWire::crc8( addr, 7) != addr[7]) {
lcd.clear(); lcd.print("CRC not valid!");
delay(1000);
return;
}
}

void getTemp() {
int foo, bar;

ds.reset();
ds.select(addr);
ds.write(0x44,1);

present = ds.reset();
ds.select(addr);
ds.write(0xBE);

for ( i = 0; i < 9; i++) {
data = ds.read();

  • }*

  • LowByte = data[0];*

  • HighByte = data[1];*

  • TReading = (HighByte << 8) + LowByte;*

  • SignBit = TReading & 0x8000; // test most sig bit*

  • if (SignBit) {*

  • TReading = -TReading;*

  • }*
    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;*

  • if (Fract > 49) {*

  • if (SignBit) {*

  • --Whole;*

  • } else {*

  • ++Whole;*

  • }*

  • }*

  • if (SignBit) {*

  • bar = -1;*

  • } else {*

  • bar = 1;*

  • }*
    _ foo = ((Whole * bar) * 18); // celsius to fahrenheit conversion section_
    _ FWhole = (((Whole * bar) * 18) / 10) + 32;_

  • if ((foo % 10) > 4) { // round up if needed*

  • ++FWhole;*

  • }*
    }
    void printTemp(void) {

  • lcd.clear();*

  • lcd.setCursor(0,0);*

  • lcd.print("Temp is: ");*

  • lcd.setCursor(0,1); *

  • if (SignBit) { *

  • lcd.print("-");*

  • }*

  • lcd.print(Whole);*

  • lcd.print(" C / ");*

  • lcd.print(FWhole);*

  • lcd.print(" F");*
    }
    void loop(void) {

  • getTemp();*

  • printTemp();*

  • delay(1000);*
    }[/quote]
    and everything is working fine except the lcd always says "Temp is: 85C / 185F "
    no matter what i do am i overlooking something in the coding

4

I don't suppose those smiley faces are doing what you think they are. There is an icon with a # sign on it that is to be used when posting code, so that doesn't happen.

  int foo, bar;
  if (SignBit) {
    bar = -1;
  } else {
    bar = 1;
  }
  foo = ((Whole * bar) * 18);      // celsius to fahrenheit conversion section

Might I politely suggest that you need to get real. Meaningful names help more than you believe.

5

Have you tried the - MilesBurton.com - ?
It contains some example code to run with multiple sensors.

in your code there is no check for a 'failed' read ...