Hello Community,
me and a friend are really struggling at the moment on our project.
We have a Arduino Uno , Ethernet Shield, DHT22 and TinyRTC.
We are hosting a website with the Humidity , Temperature and Time.
Now we want to make something like a circular buffer with arrays so we can get the temperatur from the last 5 hours.
Actually the site works fine but we don't know how to do the Array thing.
#include <RTClib.h>
#include <Wire.h>
#include <DHT.h>
#define DHTPIN 2 // what pin we're connected to
#define DHTTYPE DHT22 // DHT 22 (AM2302)
RTC_DS1307 rtc;
// Connect pin 1 (on the left) of the sensor to +5V
// Connect pin 2 of the sensor to whatever your DHTPIN is
// Connect pin 4 (on the right) of the sensor to GROUND
// Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor
DHT dht(DHTPIN, DHTTYPE);
#include <SPI.h>
#include <Ethernet.h>
// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = {
0x90, 0xA2, 0xDA, 0x00, 0x23, 0x36
}; //MAC address found on the back of your ethernet shield.
IPAddress ip(not relevant); // IP address dependent upon your network addresses.
// Initialize the Ethernet server library
// with the IP address and port you want to use
// (port 80 is default for HTTP):
EthernetServer server(80);
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(1200);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
dht.begin();
// start the Ethernet connection and the server:
Ethernet.begin(mac, ip);
server.begin();
Serial.print("server is at ");
Serial.println(Ethernet.localIP());
if (! rtc.begin()) {
Serial.println("No RTC found");
while (1);
}
if (! rtc.isrunning()) {
Serial.println("RTC is not configured");
}
rtc.adjust(DateTime(2018, 4, 28, 13, 31, 0));
}
void loop() {
DateTime now = rtc.now();
Serial.print(now.year(), DEC);
Serial.print('-');
Serial.print(now.month(), DEC);
Serial.print('-');
Serial.print(now.day(), DEC);
Serial.print(" ");
Serial.print(now.hour(), DEC);
Serial.print(':');
Serial.print(now.minute(), DEC);
Serial.print(':');
Serial.print(now.second(), DEC);
Serial.println();
delay(3000);
// Reading temperature or humidity takes about 250 milliseconds!
// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
float h = dht.readHumidity();
float t = dht.readTemperature();
// check if returns are valid, if they are NaN (not a number) then something went wrong!
if (isnan(t) || isnan(h)) {
Serial.println("Failed to read from DHT");
} else {
Serial.print("Humidity: ");
Serial.print(h);
Serial.print(" %\t");
Serial.print("Temperature: ");
Serial.print(t);
Serial.println(" *C");
}
// listen for incoming clients
EthernetClient client = server.available();
if (client) {
Serial.println("new client");
// an http request ends with a blank line
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) {
char c = client.read();
Serial.write(c);
// 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) {
// send a standard http response header
client.println("HTTP/1.1 200 Temporary Redirect");
client.println("Content-Type: text/html");
client.println("Connection: persisent"); // the connection will be closed after completion of the response
client.println("Refresh: 60"); // Alle 5 Sekunden aktualisierung
client.println();
client.println("<!DOCTYPE HTML>");
client.println("<html>");
// Datenausgabe RTC
client.println("<H2>");
client.print(now.day(), DEC);
client.print('.');
client.print(now.month(), DEC);
client.print('.');
client.print(now.year(), DEC);
client.print(" ");
client.print(now.hour(), DEC);
client.print(':');
client.print(now.minute(), DEC);
client.print(':');
client.print(now.second(), DEC);
client.println();
// Datenausgabe DHT-22
client.println("<H2>");
client.print("Luftfeuchtigkeit: ");
client.println("</H2>");
client.println("<p />");
client.println("<H1>");
client.print(h);
client.print(" %\t");
client.println("</H1>");
client.println("<p />");
client.println("<H2>");
client.print("Temperatur: ");
client.println("</H2>");
client.println("<H1>");
client.print(t);
client.println(" °");
client.println("C");
client.println("</H1>");
client.println("</html>");
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
currentLineIsBlank = false;
}
}
}
// give the web browser time to receive the data
delay(1);
// Verbindung schließen:
client.stop();
Serial.println("client disonnected");
}
}
This is our code right now. A bit messed up but it works. Right now we only need to add the Temperatur Statistic of the last 5 hours and then we would be finished with our projects.
I hope someone can help us.
Thank you so much !
