By setting the lower limits, upper limits and switch on/off using a browser, one can monitor the conditions of all switches remotely.
To control the web server outside the local area network, the NAT function of IP router should be enabled. To secure your web server, the SSH or VNC connection should be established.
Pins Used
Sensors: A2, A3
Switches: D2, D3, D4, D5, D6, D7, D8, D9
Output
Sketch
// Freeduino/Arduino Web Controlled Automatic Switches version 1.0
// By Befun Hung on Nov. 16 2012
// Modified From Freeduino/Arduino Web Sensors And Switches At cheaphousetek Blog
// The Sketch Works On Arduino IDE 1.02
#include <Ethernet.h>
#include <SPI.h>
//network NB: Pins 10, 11, 12 and 13 are reserved for Ethernet module.
#define sensorPinStart 2
#define noOfSensors 2
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
byte ip[] = { 192, 168, 1, 177 };
byte gateway[] = { 192, 168, 1, 1 };
byte subnet[] = { 255, 255, 255, 0 };
String inString = String(100);
String minValue, maxValue;
int defaultMinValue[] = {55, 56, 57, 58, 59, 60, 61, 62, 63};
int defaultMaxValue[] = {60, 61, 62, 63, 64, 65, 66, 67, 68};
String defaultOnValue[] = {"Low", "Low", "Low", "Low", "Low", "Low", "Low", "Low", "Low"};
String Led;
int led[] = {00, 2, 3, 4 ,5 ,6 ,7 ,8 ,9 }; //pin num 0 in arry is not used
int numofleds = 8; //number of switches
String value[] = {"off","off","off","off","off","off","off","off","off"}; //startup all led are off
EthernetServer server(80);
void setup()
{
delay(250);
Serial.begin(9600);
Ethernet.begin(mac, ip,gateway,subnet);
server.begin();
//set pin mode
for (int j = 1; j < (numofleds + 1); j++)
{
pinMode(led[j], OUTPUT);
}
Serial.println("Serial READY");
Serial.println("Ethernet READY");
Serial.println("Server READY");
}
void loop()
{
EthernetClient client = server.available();
if (client)
{
// an http request ends with a blank line
boolean current_line_is_blank = true;
while (client.connected())
{
if (client.available())
{
char c = client.read();
// if we've gotten to the end of the line (received a newline
// character) and the line is blank, the http request has ended,
// so we can send a reply
if (inString.length() < 35)
{
inString.concat(c);
}
if (c == '\n' && current_line_is_blank)
{
// send a standard http response header
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println();
client.println("<html>");
client.println("<meta http-equiv=\"refresh\" content=\"5\">");
client.println("<body><form method=get>");
client.println("<center><p><h1>Freeduino/Arduino Web Controlled Automatic Switches</h1></p><hr></center>");
client.println("<h2>");
// Sensor Reading and Setting -----------------------------------------------------------------------------
client.println("Sensor Reading And Setting:<br>");
for (int analogChannel = sensorPinStart ; analogChannel < sensorPinStart+noOfSensors ; analogChannel++)
{
minValue = String("Low") + analogChannel;
// fixValue = String("Fix") + analogChannel;
maxValue = String("High") + analogChannel;
Led = String("RelayOn") + analogChannel;
int sensorReading = analogRead(analogChannel);
if (inString.indexOf(minValue+"=Dn") > 0) defaultMinValue[analogChannel] -= 1;
if (inString.indexOf(minValue+"=Up") > 0) defaultMinValue[analogChannel] += 1;
if (inString.indexOf(maxValue+"=Dn") > 0) defaultMaxValue[analogChannel] -= 1;
if (inString.indexOf(maxValue+"=Up") > 0) defaultMaxValue[analogChannel] += 1;
if (inString.indexOf(Led+"=High") > 0) defaultOnValue[analogChannel] = "Low";
if (inString.indexOf(Led+"=Low") > 0) defaultOnValue[analogChannel] = "High";
client.print("Input A");
client.print(analogChannel);
client.print(":");
client.print(sensorReading);
client.print(" Low");
// client.print(analogChannel);
client.print(":");
client.print(defaultMinValue[analogChannel]);
client.print("<input type=submit name="+minValue+" value=Dn><input type=submit name="+minValue+" value=Fix><input type=submit name="+minValue+" value=Up>");
client.print(" High");
// client.print(analogChannel);
client.print(":");
client.print(defaultMaxValue[analogChannel]);
client.print("<input type=submit name="+maxValue+" value=Dn><input type=submit name="+maxValue+" value=Fix><input type=submit name="+maxValue+" value=Up>");
client.print(" On");
// client.print(analogChannel);
client.print(":");
client.print("<input type=submit name="+Led+" value="+defaultOnValue[analogChannel]+">");
client.println("<br>");
}
// Switch Monitoring -------------------------------------------------------------------------------------------
client.println("<p></p>Switches Status:<br>");
for (int i=1; i < (noOfSensors+1) ; i++)
{
Led = String("Switch") + i;
int sensorReading = analogRead(sensorPinStart+i-1);
if ((sensorReading > defaultMaxValue[sensorPinStart+i-1]) && (defaultOnValue[sensorPinStart+i-1] == "High")) {
digitalWrite(led[i], HIGH);
value[i] = "on";
}
if ((sensorReading < defaultMinValue[sensorPinStart+i-1]) && (defaultOnValue[sensorPinStart+i-1] == "High")) {
digitalWrite(led[i], LOW);
value[i] = "off";
}
if ((sensorReading < defaultMinValue[sensorPinStart+i-1]) && (defaultOnValue[sensorPinStart+i-1] == "Low")) {
digitalWrite(led[i], HIGH);
value[i] = "on";
}
if ((sensorReading > defaultMaxValue[sensorPinStart+i-1]) && (defaultOnValue[sensorPinStart+i-1] == "Low")) {
digitalWrite(led[i], LOW);
value[i] = "off";
}
client.println(Led+" <input type=submit name="+Led+" value="+value[i]+">"+"<br>");
}
client.println("</form><hr></h2>");
client.println("<center>The web page will automatically refresh every 5 seconds.</center>");
client.println("</html></body>");
break;
}
if (c == '\n')
{
// we're starting a new line
current_line_is_blank = true;
}
else if (c != '\r')
{
// we've gotten a character on the current line
current_line_is_blank = false;
}
} // End of if (client.available)
} // End of while (client.connected())
// give the web browser time to receive the data
delay(1);
inString = "";
client.stop();
} //End of if (client)
}
