I am working on a automatic watering plant system and I am trying to use moisturevalues from the potted plant to indicate if the soil has HIGH or LOW moisturevalues.
I want to turn on a red LED when the moisture is below the lowest accepted value called moistureLow.
I really dont get why the LED is not turning ON 
My code is here:
//Case project for SCE1213
//Plant monitoring
//Include libraries
#include <dht11.h>
#include <PhotoResistor.h>
#include <SoilMoisture.h>
#include <Ethernet.h>
#include <Time.h>
byte mac[] = {
0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED
};
IPAddress ip(192, 168, 1, 120);
// Initialize the Ethernet server library
// with the IP address and port you want to use
// (port 80 is default for HTTP):
EthernetServer server(80);
// Declare pin numbers for measurements
//Analog inputs
int soilMoisturePin = A1;
int pResistorPin = A0;
//Digital inputs
int dht11Pin = 2;
//Digital outputs
int moistureVoltagePin = 7;
int pumpPin = 12;
int led1 = 13;
int led2 = 12;
// Declare time variables
float hours = 0; // Change to float or long if using shorter intervals
const unsigned long interval = 0.005 * 60 * 1000UL; //0.5s for test else 30min
const unsigned long pumpInterval = 30 * 60 * 1000UL; //30min
unsigned long currentMillis = 0;
unsigned long prevMillis = 0;
unsigned long pumpMillis = 0;
unsigned long prevPumpMillis = 0;
// Declare measurement variables
int humidity = 0;
int temperature = 0;
int pResistorValue = 0;
unsigned long moistureValue = 0;
//Calibration variables
int moistureLow = 403; //Air
int moistureHigh = 1020; //Water
int lightLow = 1023; //Max voltage
int lightHigh = 0; //Min voltage
// Create class instances
dht11 DHT11;
PhotoResistor photoresistor(pResistorPin);
SoilMoisture soilmoisture(soilMoisturePin,moistureVoltagePin);
//Functions
// Read temperature and humidity from DHT11
void readDHT11()
{
int chk = DHT11.read(dht11Pin);
humidity = DHT11.humidity;
temperature = DHT11.temperature;
}
///
int lightIntensity()
{
pResistorValue = photoresistor.readValue();
//pResistorValue = 7.251*exp(pResistorValue*0.0068); //exponential line fit to lux
pResistorValue = 4*pow(10, -6)*pow(pResistorValue, 3) - 0.0016*pow(pResistorValue, 2) + 0.3867*pResistorValue - 0.5809;
//pResistorValue = map(pResistorValue,lightLow,lightHigh,100,0); // Mapping to 0-100%, remove for raw data
}
unsigned long moisture()
{
moistureValue = soilmoisture.readMoisture();
moistureValue = constrain(moistureValue, moistureLow, moistureHigh); // Check constrain values for correct reading - remove for raw data
moistureValue = map(moistureValue,moistureLow, moistureHigh,100,0); // Map to 0-100% ? - remove for raw data
}
// writetoSD.Initialize();
//Functions end
void setup()
{
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
// start the Ethernet connection and the server:
Ethernet.begin(mac, ip);
server.begin();
Serial.print("server is at ");
Serial.println(Ethernet.localIP());
pinMode(led1, OUTPUT);
//Initialize
Serial.begin(9600);
Serial.println("Program startup....");
Serial.println("Time___moisture___light___humidity___temperature");
}
void loop() //Main program
{
// 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 OK");
client.println("Content-Type: text/html");
client.println("Connection: close"); // the connection will be closed after completion of the response
client.println("Refresh: 5"); // refresh the page automatically every 5 sec
client.println();
client.println("<!DOCTYPE HTML>");
client.println("<html>");
client.println("<head>");
client.println("<title>CP1-Automatic plant watering system width='100'</title>");
client.println("</head>");
client.print("<font color= 'blue'size=’20′> <h1>CP1:Sensor measurements</h1>");
client.println("
"); //linebreak
//client.println("<time></time>");
client.print("<table border=1>");// Generating a table
client.println("<tr>");// Defining a row in table for units
client.print("<th>"); // Header cell
client.print("Moisture:");// defining a cell
client.print("<th>");
client.print("Lightintensity:"); // Header cell
// client.print("<th/>");
//client.println("
");
//client.println((float)pResistorValue, 2);
// client.println("
");
client.print("<th>"); // Header cell
client.print("Temperature (C): ");
client.print("<th>"); // Header cell
client.print("Humidity: ");
client.println("<tr />"); //end of unit row in the table
client.println("<tr>");// Defining a row in table for measurements continously updated measurement values
client.println("<td>"); // cell in table for moisture value
client.println((float) moistureValue, 1); //updated moisture value
client.println("<td>"); // cell in table for photoresistor value
client.println((float)pResistorValue, 2); //updated photoresistor value
client.println("<td>"); // cell in table for temperature value
client.println((float)DHT11.temperature, 3); //updated temperature value
client.println("<td>"); // cell in table for humidity value
client.println((float)DHT11.humidity, 4); //updated humidity value
client.println("<tr />"); // end of row
client.print("</table>"); //end table
client.println("
");
// }
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);
// close the connection:
client.stop();
Serial.println("client disconnected");
}
currentMillis = millis();
pumpMillis = millis();
if (moistureValue<=moistureLow) // alarm detecting low moisturevalue
{
digitalWrite(led1,HIGH); // turn ON red LED
delay (1000);
}
else // indicating sufficent moisturevalue by turning on green light
{
digitalWrite(led2,HIGH); // turn ON green LED
delay (1000);
}
if (currentMillis - prevMillis >= interval) {
prevMillis = currentMillis;
hours = hours + 0.5;
//Read DHT11 sensor data
readDHT11();
lightIntensity();
moisture();
Serial.println(String(hours) +" " + String(moistureValue) + " " + String(pResistorValue) + " " + String(humidity) +
" " + String(temperature));
float pumpTime = pumpMillis - prevPumpMillis;
if(moistureValue < 50 && pumpTime >= pumpInterval){ //Check if low moisture value and time since pump last ran
digitalWrite(pumpPin, HIGH);
delay(10000); //Run pump for 10seconds
digitalWrite(pumpPin, LOW);
prevPumpMillis = pumpMillis;
}
}
}
[code]