Hi,
iam doing the project to monitoring the temperature and humidity using dht 22 sensor.In my project iam trying to store data in sd card and display in the ethernet.Also provide a link in the ethernet to showing the data stored in the sd card.But its not updating the data in that link. How to link sd file with ethernet.Hereby I am attaching the code.Anyone pls suggest some methods to trobleshoot this problem.
code:
#include <SPI.h>
#include "DHT.h"
int ss=4;
#include <Ethernet.h>
#include <LiquidCrystal.h>
#include <SD.h>
#define DHTPIN 2
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal lcd(A5,A4,A3,A2,A1,A0);
byte mac[] = {0x90, 0xA2, 0xDA, 0x00, 0x23, 0x36};
IPAddress ip(192, 168, 1, 49);
EthernetServer server(80);
File myFile;
int i,j;
void setup()
{
Serial.begin(9600);
Serial.print("Initializing SD card...");
if (!SD.begin(ss)) {
Serial.println("Card failed, or not present");
return;
}
Serial.println("card initialized.");
File myFile;
myFile = SD.open("test.txt", FILE_WRITE);
if (myFile)
{
myFile.print("RH(%) Temp(*C)");
myFile.println();
myFile.close();
}
pinMode(2,INPUT);
pinMode(10,OUTPUT);
digitalWrite(10, HIGH);
dht.begin();
SPI.begin();
Ethernet.begin(mac,ip);
server.begin();
lcd.begin(16, 2);
lcd.clear();
}
void loop()
{
for(j=0;j<3;j++)
{
digitalWrite(ss, HIGH);
float h = dht.readHumidity();
float t = dht.readTemperature();
for(i=0;i<20;i++)
{
float h = dht.readHumidity();
float t = dht.readTemperature();
if (isnan(h) || isnan(t))
{
Serial.println("Failed to read from DHT sensor!");
return;
}
digitalWrite(A0, LOW);
digitalWrite(A1, LOW);
digitalWrite(A2, LOW);
digitalWrite(A3, LOW);
digitalWrite(A4, LOW);
digitalWrite(A5, LOW);
delay(100);
lcd.setCursor(0,0);
lcd.print("Humidity %:");
lcd.print(h);
lcd.setCursor(0,1);
lcd.print("Temp(*c):");
lcd.print(t);
delay(1000);
}
if (isnan(h) || isnan(t))
{
Serial.println("Failed to read from DHT sensor!");
return;
}
digitalWrite(10, LOW);
EthernetClient client = server.available();
if (client) {
Serial.println("new client");
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) {
char c = client.read();
Serial.write(c);
if (c == '\n' && currentLineIsBlank) {
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
// client.println("Content-Disposition: attachment;filename="test.txt"") ; client.println("Connection: close");
//client.println("Refresh: 20"); // refresh the page automatically every 60 sec
client.println();
client.println("");
client.println("");
client.println("Data of Sensor");
client.print("Humidity(%): ");
client.print(h);
client.println("
");
client.print("Temperature(*C): ");
client.print(t);
client.println("
");
client.println("test.txt");
client.println("");
break;
}
if (c == '\n')
{
currentLineIsBlank = true;
}
else if (c != '\r')
{
currentLineIsBlank = false;
}
}
}
delay(1);
client.stop();
}
digitalWrite(10, HIGH);
delay(1000);
}
j=3;
if(j=3)
{
digitalWrite(ss, LOW);
float h = dht.readHumidity();
float t = dht.readTemperature();
File myFile = SD.open("test.txt", FILE_WRITE);
if (myFile)
{
myFile.print(h, 2);
myFile.print(" ");
myFile.print(t, 2);
myFile.println();
myFile.close();
}
else {
Serial.println("error opening test.txt");
}
delay (1);
digitalWrite(ss, HIGH);
}
j=0;
}
