ds18b20 newbie

Other Hardware Sensors
1

this is joel
i just started with the arduino uno
i can get the example blink to work properly on the uno
trying to get the ds18b20 temp sensor to work
i have the onewire library downloaded and installed
i get the error below, below that is the code i am using
also i am using windows xp, don't know if that makes a difference

Blink:4: error: 'OneWire' does not name a type
Blink.ino: In function 'void loop()':
Blink:18: error: 'ds' was not declared in this scope
Blink:30: error: 'OneWire' has not been declared

#include <OneWire.h>

// DS18S20 Temperature chip i/o
OneWire ds(10); // on pin 10 << error happens here

void setup(void) {
// initialize inputs/outputs
// start serial port
Serial.begin(9600);
}

void loop(void) {
byte i;
byte present = 0;
byte data[12];
byte addr[8];

if ( !ds.search(addr)) {
Serial.print("No more addresses.\n");
ds.reset_search();
return;
}

Serial.print("R=");
for( i = 0; i < 8; i++) {
Serial.print(addr*, HEX);*

  • Serial.print(" ");*
  • }*
  • if ( OneWire::crc8( addr, 7) != addr[7]) {*
  • Serial.print("CRC is not valid!\n");*
  • return;*
  • }*
  • if ( addr[0] == 0x10) {*
  • Serial.print("Device is a DS18S20 family device.\n");*
  • }*
  • else if ( addr[0] == 0x28) {*
  • Serial.print("Device is a DS18B20 family device.\n");*
  • }*
  • else {*
  • Serial.print("Device family is not recognized: 0x");*
  • Serial.println(addr[0],HEX);*
  • return;*
  • }*
  • ds.reset();*
  • ds.select(addr);*
  • 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); *
  • ds.write(0xBE); // Read Scratchpad*
  • Serial.print("P=");*
  • Serial.print(present,HEX);*
  • Serial.print(" ");*
  • for ( i = 0; i < 9; i++) { // we need 9 bytes*
    _ data = ds.read();_
    _ Serial.print(data*, HEX);
     Serial.print(" ");
     }
     Serial.print(" CRC=");
     Serial.print( OneWire::crc8( data, 8), HEX);
     Serial.println();
    }*_
2

A blinking led is already a good result. That means that everything is working.

This is the main page for OneWire: Arduino Playground - OneWire
The OneWire library is not included with the Arduino software, you have to add that.
http://arduino.cc/en/Guide/Libraries

3

Here is a good source. Note that there are two programmes, one to determine the built-in address, and the other to use the devices(es)

4

The "'OneWire' does not name a type" error means that OneWire.h is not being loaded. You either placed it in an incorrect directory, the file is corrupt, or need to restart your IDE.

5

got past the OneWire ds(10); // on pin 10 error
have this sketch built in the libraries directory so all libraries should be accessable
now i get this error using the above code

BareMinimum.ino: In function 'void loop()':
BareMinimum:26: error: call of overloaded 'print(byte [8], int)' is ambiguous
C:\arduino\arduino-1.0.5-r2-windows\arduino-1.0.5-r2\hardware\arduino\cores\arduino/Print.h:59: note: candidates are: size_t Print::print(unsigned char, int)
C:\arduino\arduino-1.0.5-r2-windows\arduino-1.0.5-r2\hardware\arduino\cores\arduino/Print.h:60: note: size_t Print::print(int, int)
C:\arduino\arduino-1.0.5-r2-windows\arduino-1.0.5-r2\hardware\arduino\cores\arduino/Print.h:61: note: size_t Print::print(unsigned int, int)
C:\arduino\arduino-1.0.5-r2-windows\arduino-1.0.5-r2\hardware\arduino\cores\arduino/Print.h:62: note: size_t Print::print(long int, int)
C:\arduino\arduino-1.0.5-r2-windows\arduino-1.0.5-r2\hardware\arduino\cores\arduino/Print.h:63: note: size_t Print::print(long unsigned int, int)
BareMinimum:62: error: incompatible types in assignment of 'uint8_t' to 'byte [12]'
BareMinimum:63: error: call of overloaded 'print(byte [12], int)' is ambiguous
C:\arduino\arduino-1.0.5-r2-windows\arduino-1.0.5-r2\hardware\arduino\cores\arduino/Print.h:59: note: candidates are: size_t Print::print(unsigned char, int)
C:\arduino\arduino-1.0.5-r2-windows\arduino-1.0.5-r2\hardware\arduino\cores\arduino/Print.h:60: note: size_t Print::print(int, int)
C:\arduino\arduino-1.0.5-r2-windows\arduino-1.0.5-r2\hardware\arduino\cores\arduino/Print.h:61: note: size_t Print::print(unsigned int, int)
C:\arduino\arduino-1.0.5-r2-windows\arduino-1.0.5-r2\hardware\arduino\cores\arduino/Print.h:62: note: size_t Print::print(long int, int)
C:\arduino\arduino-1.0.5-r2-windows\arduino-1.0.5-r2\hardware\arduino\cores\arduino/Print.h:63: note: size_t Print::print(long unsigned int, int)
BareMinimum:67: error: 'smiley' was not declared in this scope
BareMinimum:67: error: 'cool' was not declared in this scope