In this instructable (my first instructable) we will create a temperature and humidity datalogger adding the posibility to access the data by web.
The new arduino ethernet makes everything sooooooo easy that it looks like magic. In the same board you get: an ATMega 328, ethernet conectivity, sd card
Only need a RTC (Real Time Clock) in order to have a full datalogger. I will plan to make another instructable about how to conect a RTC to this board.
You can connect to my own arduino server in order to see my server room temperature.
The new arduino ethernet makes everything sooooooo easy that it looks like magic. In the same board you get: an ATMega 328, ethernet conectivity, sd card
Only need a RTC (Real Time Clock) in order to have a full datalogger. I will plan to make another instructable about how to conect a RTC to this board.
You can connect to my own arduino server in order to see my server room temperature.
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Signing UpStep 1: The basic stuff
Lets me show how easy is to make a datalogger that saves sensor data in a SD card and allow remote access by web using any browser.
We will use three DHT11 sensor as source of data. Every DHT11 give us temperature and humidity data. They are really cheap (2€ iin ebay) and more or less acurrate ;-) : 2 Celsius degree and 5% of humidity. In the case you want more acurrate data, the DHT22 could be your election.
I apologize for using Celsius degrees. That is because I radicate in Spain. Changing the units to Fahrenheit degrees it is really easy.
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// close the connection:
client.stop();
}
else
{
//if(nFiles>=0 && file)
{
file= SD.open("datalog.txt", FILE_WRITE);
}
String data="";
for(int i=0;i
}
if(file)
{
file.println(data);
Serial.println(data);
file.close();
nFilas++;
}
delay(1000);
for(int i=0;i getdataDHT(i);
delay(1000);
getdataOneWire();
}
}
This is the code I'm using now in a bit more complex project. You can remove the OneWire part
I hope this helps
#include <SPI.h>
#include <Ethernet.h>
#include <OneWire.h>
#include <dht11.h> // Descargamos la librería desde http://arduino-info.wikispaces.com/DHT11-Humidity-TempSensor
dht11 DHT11;
#define nSensoresDHT 6
#define nSensoresOneWire 3
int puertosDHT[]={2,3,5,6,7,8}; // ¿Por qué nos saltamos el 4?
int puertoOneWire=9;
OneWire ds(puertoOneWire);
float fHumedades[nSensoresDHT];
float fTemperaturas[nSensoresDHT+nSensoresOneWire];
int iNVisitas=0;
// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xEE, 0xEE };
byte ip[] = { 192,168,1, 177 };
// Initialize the Ethernet server library
// with the IP address and port you want to use
// (port 80 is default for HTTP):
EthernetServer server(666);
void setup()
{
// start the Ethernet connection and the server:
Ethernet.begin(mac, ip);
server.begin();
Serial.begin(115200);
}
float tMin=100;
float tMax=0;
float tMedia=0;
int contador=0;
void getdataOneWire()
{
byte i;
byte present = 0;
byte type_s;
byte data[12];
byte addr[8];
float celsius;
if ( !ds.search(addr)) {
Serial.print(contador);
Serial.println(" DS18x20 encontrados");
Serial.print("Tmax=");
Serial.print(tMax);
Serial.print(" Tmin=");
Serial.print(tMin);
Serial.print(" tmedia=");
Serial.println( tMedia/contador);
ds.reset_search();
contador=0;
tMedia=0;
delay(250);
return;
}
Serial.print("ROM =");
for( i = 0; i < 8; i++) {
if(addr[i]<16)
Serial.print(" 0");
else
Serial.write(' ');
Serial.print(addr[i], HEX);
}
if (OneWire::crc8(addr, 7) != addr[7]) {
Serial.println("CRC is not valid!");
return;
}
// Serial.println();
// the first ROM byte indicates which chip
switch (addr[0]) {
case 0x10:
Serial.print(" DS18S20"); // or old DS1820
type_s = 1;
break;
case 0x28:
Serial.print(" DS18B20");
type_s = 0;
break;
case 0x22:
Serial.print(" DS1822");
type_s = 0;
break;
default:
Serial.print("Not a DS18x20");
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
for ( i = 0; i < 9; i++) { // we need 9 bytes
data[i] = ds.read();
}
// convert the data to actual temperature
unsigned int raw = (data[1] << 8) | data[0];
if (type_s) {
raw = raw << 3; // 9 bit resolution default
if (data[7] == 0x10) {
// count remain gives full 12 bit resolution
raw = (raw & 0xFFF0) + 12 - data[6];
}
} else {
byte cfg = (data[4] & 0x60);
if (cfg == 0x00) raw = raw << 3; // 9 bit resolution, 93.75 ms
else if (cfg == 0x20) raw = raw << 2; // 10 bit res, 187.5 ms
else if (cfg == 0x40) raw = raw << 1; // 11 bit res, 375 ms
// default is 12 bit resolution, 750 ms conversion time
}
celsius = (float)raw / 16.0;
fTemperaturas[nSensoresDHT+contador]=celsius;
if(tMin>celsius)
tMin=celsius;
if(tMax<celsius)
tMax=celsius;
tMedia+=celsius;
Serial.print(" Temp.= ");
Serial.print(celsius);
Serial.println("C");
contador++;
}
void getdataDHT(int iIndice)
{
int chk = DHT11.read(puertosDHT[iIndice]);
fHumedades[iIndice]=-1;
fTemperaturas[iIndice]=-1;
Serial.print("Sensor ");
Serial.print(iIndice);
Serial.print(" ");
switch (chk)
{
case 0:
fHumedades[iIndice]=(float)DHT11.humidity;
Serial.print(fHumedades[iIndice], 2);
Serial.print(" % ");
fTemperaturas[iIndice]=(float)DHT11.temperature;
Serial.print(fTemperaturas[iIndice], 2);
Serial.println(" o C");
break;
case -1: Serial.println(" Checksum error"); break;
case -2: Serial.println(" Time out error"); break;
default: Serial.println(" Unknown error"); break;
}
}
void loop()
{
// listen for incoming clients
EthernetClient client = server.available();
String sURL;
if (client) {
// an http request ends with a blank line
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) {
char c = client.read();
// if you've gotten to the end of the line (received a newline
// character) and the line is blank, the http request has ended,
// so you can send a reply
if (c == '\n' && currentLineIsBlank) {
sURL=sURL.substring(0,9);
Serial.println(sURL);
if(sURL.endsWith("csv "))
{
for(int i=0;i<nSensoresDHT;i++){
client.print(fHumedades[i], 2);
client.print(";");
client.print(fTemperaturas[i], 2);
client.print(";");
}
for(int i=0;i<nSensoresOneWire;i++){
client.print(fTemperaturas[nSensoresDHT+i]);
client.print(";");
}
client.println("");
}
else
{
// send a standard http response header
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println();
// client.println("<meta http-equiv=\"refresh\" content=\"1\" />"); //Autorefresh de la página
// output the value of each analog input pin
for(int i=0;i<nSensoresDHT;i++){
client.print("sensorDHT ");
client.print(i);
client.print(": ");
if(fHumedades[i]==-1)
client.print(" error leyendo el sensor");
else
{
client.print(fHumedades[i], 2);
client.print(" % ");
client.print(fTemperaturas[i], 2);
client.println(" C");
}
client.println("<br />");
}
for(int i=0;i<nSensoresOneWire;i++){
client.print("sensorOneWire ");
client.print(i);
client.print(": ");
client.print(fTemperaturas[nSensoresDHT+i]);
client.println(" C<br />");
}
client.print((iNVisitas++)/2);
client.println(" visitas <br />");
}
break;
}
if (c == '\n') {
// you're starting a new line
currentLineIsBlank = true;
}
else if (c != '\r') {
// you've gotten a character on the current line
sURL+=c;
currentLineIsBlank = false;
}
}
}
// give the web browser time to receive the data
delay(1);
// close the connection:
client.stop();
}
else
{
for(int i=0;i<nSensoresDHT;i++)
getdataDHT(i);
delay(100);
getdataOneWire();
}
}
sensor 0: error leyendo el sensor
sensor 1: error leyendo el sensor
sensor 2: error leyendo el sensor
i think there are much more differences between old and new versions
You can fix it changing the declaration of puertos with this one
int puertos[]={2,3,4};
I hope this helps
can you say why does line
puertos={2,3,4};
give me an error?
expected primary expression before { token
Maybe my code need a revision for arduino 1.0
No serás forococheros verdad? te encontrarias un monton de cosas en la plataforma...
so nice.
i can try =)
I'll check it