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1  Topics / Home Automation and Networked Objects / Re: Ethernet Shield Connection Problems on: January 02, 2013, 07:01:32 am
Thank you, it works!!
2  Topics / Home Automation and Networked Objects / Ethernet Shield Connection Problems on: January 02, 2013, 03:20:33 am
Hi!

I'm checking arduino ethernet shield with a little example and only once it's connected.
This is the code of the example:

Code:
#include <Ethernet.h>
#include <SPI.h>

byte mac[] = {0x00,0x4F,0x6A,0x05,0x12,0x40};
byte ip[] = {192, 168, 0, 11};        // Ip adress
byte server[] = {173, 194, 34, 31};   // Google server

EthernetClient client;

void setup()
{
  Ethernet.begin(mac,ip);            // start ethernet using the mac and IP adress
  Serial.begin(9600);                 // start the serial library;
  delay(1000);
 
  Serial.println("connecting...");
 
  if (client.connect(server, 80))
  {
    Serial.println("Connected");
    client.println("GET /search?q=arduino HTTP/1.0");    // the HTTP request
    client.println();
  }
  else
  {
    Serial.println("connection failed");
  }
}

void loop()
{
  if(client.available())
  {
    char c = client.read();
    Serial.print(c);                  // echo all data received to the Serial Monitor
  }
  if(!client.connected())
  {
    Serial.println();
    Serial.println("disconnnecting.");
    client.flush();
    client.stop();
    for(;;)
    ;
  }
}

In my opinion, I think It's a router problem but I don't know because it's very weird.
A few days ago, it happened the same problem and magically today it's connected again but now I have the same problem.
3  Using Arduino / Sensors / Re: Checksum Error in DHT11 on: December 04, 2012, 06:42:54 am
Today I checked with other DHT11 and it runs correctly so maybe it was the PCB or own sensor.

Thank you very much!
4  Using Arduino / Sensors / Re: Checksum Error in DHT11 on: December 03, 2012, 05:38:37 am
OK, this is the code

//
//   FILE:  dht11_test1.pde
// PURPOSE: DHT11 library test sketch for Arduino
//

//Celsius to Fahrenheit conversion
double Fahrenheit(double celsius)
{
   return 1.8 * celsius + 32;
}

//Celsius to Kelvin conversion
double Kelvin(double celsius)
{
   return celsius + 273.15;
}

// dewPoint function NOAA
// reference: http://wahiduddin.net/calc/density_algorithms.htm
double dewPoint(double celsius, double humidity)
{
   double A0= 373.15/(273.15 + celsius);
   double SUM = -7.90298 * (A0-1);
   SUM += 5.02808 * log10(A0);
   SUM += -1.3816e-7 * (pow(10, (11.344*(1-1/A0)))-1) ;
   SUM += 8.1328e-3 * (pow(10,(-3.49149*(A0-1)))-1) ;
   SUM += log10(1013.246);
   double VP = pow(10, SUM-3) * humidity;
   double T = log(VP/0.61078);   // temp var
   return (241.88 * T) / (17.558-T);
}

// delta max = 0.6544 wrt dewPoint()
// 5x faster than dewPoint()
// reference: http://en.wikipedia.org/wiki/Dew_point
double dewPointFast(double celsius, double humidity)
{
   double a = 17.271;
   double b = 237.7;
   double temp = (a * celsius) / (b + celsius) + log(humidity/100);
   double Td = (b * temp) / (a - temp);
   return Td;
}


#include <dht11.h>

dht11 DHT11;

#define DHT11PIN 2

void setup()
{
  Serial.begin(115200);
  Serial.println("DHT11 TEST PROGRAM ");
  Serial.print("LIBRARY VERSION: ");
  Serial.println(DHT11LIB_VERSION);
  Serial.println();
}

void loop()
{
  Serial.println("\n");

  int chk = DHT11.read(DHT11PIN);

  Serial.print("Read sensor: ");
  switch (chk)
  {
    case DHTLIB_OK:
      Serial.println("OK");
      break;
    case DHTLIB_ERROR_CHECKSUM:
      Serial.println("Checksum error");
      break;
    case DHTLIB_ERROR_TIMEOUT:
      Serial.println("Time out error");
      break;
    default:
      Serial.println("Unknown error");
      break;
  }

  Serial.print("Humidity (%): ");
  Serial.println((float)DHT11.humidity, 2);

  Serial.print("Temperature (oC): ");
  Serial.println((float)DHT11.temperature, 2);

  Serial.print("Temperature (oF): ");
  Serial.println(Fahrenheit(DHT11.temperature), 2);

  Serial.print("Temperature (K): ");
  Serial.println(Kelvin(DHT11.temperature), 2);

  Serial.print("Dew Point (oC): ");
  Serial.println(dewPoint(DHT11.temperature, DHT11.humidity));

  Serial.print("Dew PointFast (oC): ");
  Serial.println(dewPointFast(DHT11.temperature, DHT11.humidity));

  delay(2000);
}
//
// END OF FILE
//

I have tried without ethernet and nothing.

Sometimes appears Timeout error and other times Checksum error.
5  Using Arduino / Sensors / Checksum Error in DHT11 on: November 30, 2012, 10:23:56 am
Hi!!!

I'm testing DHT11 sensor with the code I saw in this page:

http://arduino.cc/playground/Main/DHT11Lib

And it's impossible always the same problem "Checksum Error". I've tried with other codes and the same problem always happens.

I've checked elctrical parts, ports... I use Arduino One with Ethernet Shield.

Somebody can I help me?

In advance, thank you very much.
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