Tutorial arduino: room light and temperature levels check and adjust with autorefresh
For this tutorial, we’re going to explain you all about this project, which consists on controlling the temperature and the light from the web page. It’s based on old projects but this one has new features.
Here are the components we used:
- 1 Arduino
- 1 Ethernet Shield
- 1 Relay
- 1 Temperature sensor
- 1 Light sensor
- 3 Leds
- 3 Resistors
The web page has two different tables, one for the temperature and one for the light. Above the text boxes appears the value we put in the text box, which represents the temperature/light we want it to be. Above that there’s the actual temperature/light in the room where the sensor is located.
Depending on the values we put comparing with the temperature, above the table appears text saying when to turn on/off the air conditioner.
How it looks:
Same temperature:
Lower temperature:
Higher temperature:
Code:
#include <String.h> #include <SPI.h> #include <Ethernet.h> byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; // mac address byte ip[] = { 192, 168, 1, 25 }; // ip arduino internet in byte subnet[] = { 255, 255, 255, 0 }; //subnet mask EthernetServer server(80); //server port int outPin = 9; // pin String readString; //string int temp1=0 , temp2=0; int vrif = 1.1; int Rele = 0; void setup(){ Ethernet.begin(mac, ip, subnet); pinMode(outPin, OUTPUT); analogReference(INTERNAL); //lowers the voltage reference pinMode(8,OUTPUT); //cold pinMode(9,OUTPUT); // hot pinMode(7,OUTPUT); // rele pinMode(5,INPUT); pinMode(0,INPUT); Serial.begin(9600); } void loop() { /*Client*/ String string; int i=0; //y1 = temperatura e light = light level from user long int Rlight=0; float TempAverage=0; int y1=0, light=0; // references posted by the user! EthernetClient client = server.available(); TempAverage=analogRead(5); Rlight=analogRead(0); TempAverage = (95.0 * vrif * TempAverage) / 1024.0; Rlight*=100; Rlight/=1024; if (client) { boolean currentLineIsBlank = true; while (1) { if (client.available()) { char c = client.read(); readString.concat(c); //Serial.println(readString); //if HTTP request has ended if (c == '\n' && currentLineIsBlank) { Serial.println(readString); string = readString; if(readString.indexOf("T=") > 0) { for(i=0;string[i];i++) { if(string[i] == 'T' && string[i+1] == '=' && string[i+2] >=48 && string[i+3] <= 57) { switch(string[i+2]) { case 48: y1+= 0; break; case 49: y1+=10; break; case 50: y1+=20; break; case 51: y1+=30; break; case 52: y1+=40; break; case 53: y1+=50; break; case 54: y1+=60; break; case 55: y1+=70; break; case 56: y1+=80; break; case 57: y1+=90; break; } switch(string[i+3]) { case 48: y1+= 0; break; case 49: y1+=1; break; case 50: y1+=2; break; case 51: y1+=3; break; case 52: y1+=4; break; case 53: y1+=5; break; case 54: y1+=6; break; case 55: y1+=7; break; case 56: y1+=8; break; case 57: y1+=9; break; } } } } if(readString.indexOf("L=") > 0) { for(i=0;string[i];i++) { if(string[i] == 'L' &&string[i+1] == '=' && string[i+2] >=48 && string[i+3] <= 57) { switch(string[i+2]) { case 48: light+= 0; break; case 49: light+=10; break; case 50: light+=20; break; case 51: light+=30; break; case 52: light+=40; break; case 53: light+=50; break; case 54: light+=60; break; case 55: light+=70; break; case 56: light+=80; break; case 57: light+=90; break; } switch(string[i+3]) { case 48: light+= 0; break; case 49: light+=1; break; case 50: light+=2; break; case 51: light+=3; break; case 52: light+=4; break; case 53: light+=5; break; case 54: light+=6; break; case 55: light+=7; break; case 56: light+=8; break; case 57: light+=9; break; } } } } break; } } } if(temp1 < (int)TempAverage && temp1 != 0) { Rele=1; } if(temp1 > (int)TempAverage && temp1 != 0) { Rele=1; } if(temp1 == (int)TempAverage && temp1 != 0) { Rele=0; } // Web page: client.println("<!DOCTYPE html>"); client.println("<?php session_start(); ?>"); client.println("<html> "); client.println("<table><tr><th>"); /* client.println("<table border=""><tr><th>System Status</th><th> "); if(Rele == 1) { client.println("ON"); client.println("</th></table><th></th></tr>"); } else { client.println("OFF"); client.println("</th></table><th></th></tr>"); } */ client.println(" <tr><td><table border=""><tr><th>Reference Temperature </th>"); client.println("<th><form action="" method=""get""><input type=""text"" name=""T"" value=""Insert value""><input type=""submit"" value=""check""><?phpif(!isset($_GET['temp']))$var_1 = "";else$var_1 = $_GET['temp'];$_SESSION['data'] = $var_1;?></th>"); client.println("<tr></tr><th>Reference temperature set to </th><th>"); if(y1 == 0) client.print(temp1); else client.print(y1); client.print("</th><tr>"); client.println("<tr><th>Temperature of the room </th><th>"); if(Rele == 1) TempAverage-=12; else { } client.println(TempAverage); client.print("</th></tr>"); client.println("</table></td>"); client.println("<td></td><td><table border=""><tr><th>Reference Light</th><th>"); client.println("<form action="" method=""get""><input type=""text"" name=""L"" value=""Insert percentage""><input type=""submit"" value=""Try""><?phpif(!isset($_GET['temp']))$var_2 = "";else$var_2 = $_GET['temp'];$_SESSION['data'] = $var_2;?></th></tr>"); client.println("<tr></tr><th>Refence light set to </th><th>"); if(light == 0) client.print(temp2); else client.print(light); client.print("%</th>"); client.println("<tr><th>Light leven of the room </th><th>"); client.print(Rlight); client.print("%</th></tr></table></td></tr>"); client.println("</table>"); if(temp1 < (int)TempAverage && temp1 != 0) { client.println("<p>Turn heater ON!</p>"); digitalWrite(7,HIGH); // RELE digitalWrite(8,LOW); // blue digitalWrite(9,HIGH); // reed } if(temp1 > (int)TempAverage && temp1 != 0) { client.println("<p>Turn Air conditioner ON!</p>"); digitalWrite(7,HIGH); // RELE digitalWrite(8,HIGH); // blue digitalWrite(9,LOW); // reed } if(temp1 == (int)TempAverage && temp1 != 0) { client.println("<p>Teperature OK!</p>"); digitalWrite(7,LOW); // REL digitalWrite(8,LOW); // green digitalWrite(9,LOW); // reed } client.println("</body></html>"); readString=""; if(y1 != temp1 && y1 != 0) temp1=y1; if(light != temp2 && light != 0) temp2=light; client.stop(); } }
29 of July 2014
Alexandre Leitao
Gonçalo Neto