ESP8266 Community Forum

- Tue Feb 06, 2018 9:40 am #73748 Hi,

I am not sure if this is the right place for this question, but I get a conflict on OneWire.h while compiling. Appearently there is one in DallasTemperature besides the original OneWire library. Following a post here I renamed the "OneWire¨ directory to OneWireStandard, this did not help. Any help woulbe greatly appreciated.
The Error message I get (using Arduino IDE 1.6.8) is:

Code: Select allArduino: 1.6.8 (Linux), Board: "NodeMCU 0.9 (ESP-12 Module), 80 MHz, 4M (1M SPIFFS), v2 Prebuilt (MSS=536), Disabled, None, 115200"

libraries/DallasTemperature/OneWire.cpp.o: In function `OneWire::depower()':
Multiple libraries were found for "OneWire.h"
 Used: /home/peter/Documenten/Arduino/Sketches/libraries/OneWireStandard
 Not used: /home/peter/Documenten/Arduino/Sketches/libraries/DallasTemperature
/home/peter/Documenten/Arduino/Sketches/libraries/DallasTemperature/OneWire.cpp:163: multiple definition of `OneWire::reset()'
libraries/OneWireStandard/OneWire.cpp.o:/home/peter/Documenten/Arduino/Sketches/libraries/OneWireStandard/OneWire.cpp:163: first defined here
libraries/DallasTemperature/OneWire.cpp.o: In function `OneWire::search(unsigned char*, bool)':
/home/peter/Documenten/Arduino/Sketches/libraries/DallasTemperature/OneWire.cpp:197: multiple definition of `OneWire::write_bit(unsigned char)'
libraries/OneWireStandard/OneWire.cpp.o:/home/peter/Documenten/Arduino/Sketches/libraries/OneWireStandard/OneWire.cpp:197: first defined here
libraries/DallasTemperature/OneWire.cpp.o: In function `OneWire::read_bit()':
/home/peter/Documenten/Arduino/Sketches/libraries/DallasTemperature/OneWire.cpp:225: multiple definition of `OneWire::read_bit()'
libraries/OneWireStandard/OneWire.cpp.o:/home/peter/Documenten/Arduino/Sketches/libraries/OneWireStandard/OneWire.cpp:225: first defined here
libraries/DallasTemperature/OneWire.cpp.o: In function `OneWire::write(unsigned char, unsigned char)':
/home/peter/Documenten/Arduino/Sketches/libraries/DallasTemperature/OneWire.cpp:249: multiple definition of `OneWire::write

Last edited by Petervdpol on Fri Feb 09, 2018 2:17 am, edited 3 times in total.

- Tue Feb 06, 2018 3:59 pm #73758 Hi, it's look to me you're including your libraries twice :
- first as : /home/peter/Documenten/Arduino/Sketches/libraries/OneWireStandard/
- secondly as libraries/ which seems to be really /home/peter/Documenten/Arduino/Sketches/libraries/ . It's strange as on my own system, this directory is located in ~/Arduino/libraries

It's an IDE configuration issue, not related to DallasTemperature itself.

Bye

PS : I made my own library for 1wire probes (not only temperature ones, GPIO as well) : https://github.com/destroyedlolo/OWBus
I would be happy to get some feedback, testing or comment
PS2 : by the way, it will not solve your issue.

- Thu Feb 08, 2018 7:16 am #73798 Thank you for your reply, However, I suspect the IDE is confusing things since the OneWire lib is only included once, see below. There is however a OneWire.h in both OneWire (obviously) and the DallasTemperture lib...

Code: Select all#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
#include <WiFiClient.h>
#include <OneWire.h>
#include <DallasTemperature.h>


//------------------------------------------
//DS18B20
#define ONE_WIRE_BUS D3 //Pin to which is attached a temperature sensor
#define ONE_WIRE_MAX_DEV 15 //The maximum number of devices

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature DS18B20(&oneWire);
int numberOfDevices; //Number of temperature devices found
DeviceAddress devAddr[ONE_WIRE_MAX_DEV];  //An array device temperature sensors
float tempDev[ONE_WIRE_MAX_DEV]; //Saving the last measurement of temperature
float tempDevLast[ONE_WIRE_MAX_DEV]; //Previous temperature measurement
long lastTemp; //The last measurement
const int durationTemp = 5000; //The frequency of temperature measurement

//------------------------------------------
//WIFI
const char* ssid = "";
const char* password = "";

//------------------------------------------
//HTTP
ESP8266WebServer server(80);

//------------------------------------------
//Convert device id to String
String GetAddressToString(DeviceAddress deviceAddress) {
  String str = "";
  for (uint8_t i = 0; i < 8; i++) {
    if ( deviceAddress[i] < 16 ) str += String(0, HEX);
    str += String(deviceAddress[i], HEX);
  }
  return str;
}

//Setting the temperature sensor
void SetupDS18B20() {
  DS18B20.begin();

  Serial.print("Parasite power is: ");
  if ( DS18B20.isParasitePowerMode() ) {
    Serial.println("ON");
  } else {
    Serial.println("OFF");
  }

  numberOfDevices = DS18B20.getDeviceCount();
  Serial.print( "Device count: " );
  Serial.println( numberOfDevices );

  lastTemp = millis();
  DS18B20.requestTemperatures();

  // Loop through each device, print out address
  for (int i = 0; i < numberOfDevices; i++) {
    // Search the wire for address
    if ( DS18B20.getAddress(devAddr[i], i) ) {
      //devAddr[i] = tempDeviceAddress;
      Serial.print("Found device ");
      Serial.print(i, DEC);
      Serial.print(" with address: " + GetAddressToString(devAddr[i]));
      Serial.println();
    } else {
      Serial.print("Found ghost device at ");
      Serial.print(i, DEC);
      Serial.print(" but could not detect address. Check power and cabling");
    }

    //Get resolution of DS18b20
    Serial.print("Resolution: ");
    Serial.print(DS18B20.getResolution( devAddr[i] ));
    Serial.println();

    //Read temperature from DS18b20
    float tempC = DS18B20.getTempC( devAddr[i] );
    Serial.print("Temp C: ");
    Serial.println(tempC);
  }
}

//Loop measuring the temperature
void TempLoop(long now) {
  if ( now - lastTemp > durationTemp ) { //Take a measurement at a fixed time (durationTemp = 5000ms, 5s)
    for (int i = 0; i < numberOfDevices; i++) {
      float tempC = DS18B20.getTempC( devAddr[i] ); //Measuring temperature in Celsius
      tempDev[i] = tempC; //Save the measured value to the array
    }
    DS18B20.setWaitForConversion(false); //No waiting for measurement
    DS18B20.requestTemperatures(); //Initiate the temperature measurement
    lastTemp = millis();  //Remember the last time measurement
  }
}

//------------------------------------------
void HandleRoot() {
  String message = "Number of devices: ";
  message += numberOfDevices;
  message += "\r\n<br>";
  char temperatureString[6];

  message += "<table border='1'>\r\n";
  message += "<tr><td>Device id</td><td>Temperature</td></tr>\r\n";
  for (int i = 0; i < numberOfDevices; i++) {
    dtostrf(tempDev[i], 2, 2, temperatureString);
    Serial.print( "Sending temperature: " );
    Serial.println( temperatureString );

    message += "<tr><td>";
    message += GetAddressToString( devAddr[i] );
    message += "</td>\r\n";
    message += "<td>";
    message += temperatureString;
    message += "</td></tr>\r\n";
    message += "\r\n";
  }
  message += "</table>\r\n";

  server.send(200, "text/html", message );
}

void HandleNotFound() {
  String message = "File Not Found\n\n";
  message += "URI: ";
  message += server.uri();
  message += "\nMethod: ";
  message += (server.method() == HTTP_GET) ? "GET" : "POST";
  message += "\nArguments: ";
  message += server.args();
  message += "\n";
  for (uint8_t i = 0; i < server.args(); i++) {
    message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
  }
  server.send(404, "text/html", message);
}


//------------------------------------------
void setup() {
  //Setup Serial port speed
  Serial.begin(115200);

  //Setup WIFI
  WiFi.begin(ssid, password);
  Serial.println("");

  //Wait for WIFI connection
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  server.on("/", HandleRoot);
  server.onNotFound( HandleNotFound );
  server.begin();
  Serial.println("HTTP server started at ip " + WiFi.localIP().toString() );

  //Setup DS18b20 temperature sensor
  SetupDS18B20();

}

void loop() {
  long t = millis();

  server.handleClient();
  TempLoop( t );
}


- Thu Feb 08, 2018 10:45 am #73805 It is confusing as it is not obvious that the Dallas already has the OneWire in it.

Renaming the OneWire library will not help as the IDE still finds it.

Just remove it altogether or zip it and delete the original.