I am doing my MSc project in Greenwich Uni UK. It would be very helpful if I could get some literature for the gas measurement project.

Regards.

I am glad this article will be of use! Unfortunately I cannot say specifically what the gains may or may not be because it is not recommended to use a different antenna and I have not tried it.

Regards

Richard.

#include
#include
#include

#include
#include
#include

// — [ Pin setup ] —
int sensorPin = 5;
int ledPin = 9;
int fanPin = 7;
int tempPin = 3;
int unlockPin = 8;

// — [ Ethernet setup ] —
static uint8_t mac[6] = { 0×02, 0xAA, 0xAA, 0xCC, 0×00, 0×22 };
static uint8_t ip[4] = { 192,168,123,99};
static uint8_t gateway[4] = { 192,168,123,254};
int serverPort = 80;

String url = String(25);
int maxLength=25;

// — [ Variables to control when the unit fan kicks in/cuts out... ] —
float maxTemp = 26.0;
float minTemp = 24.0;

// — [ Variables to store our sensor values ] —
volatile int totalTicks = 0;
float tempc = 0.0;
int maxi = -100, mini = 100;

// — [ Misc. vars ] —
float inputVolts = 5.01;
int previousState = -2;
int delayMs = 1500;
int i;
boolean lock;

EthernetServer server(serverPort);

void setup() {
pinMode(ledPin, OUTPUT);
pinMode(fanPin, OUTPUT);
pinMode(sensorPin, INPUT);
pinMode(unlockPin, INPUT);
previousState = digitalRead(sensorPin);
Serial.begin(115200); // Use serial for debugging locally…
Serial.println(“Ardugas server saying: Howdy!”);
Ethernet.begin(mac, ip, gateway);
server.begin();
}

void loop() {
checkUnitTemp(); // Take action based on unit temp
checkSensor(); // Check the gas meter sensor

listenWeb(); // Handle any web connections
digitalWrite(ledPin, !digitalRead(sensorPin)); // Light LED if sensor is LOW
}

// Serve pachube EEML and accept a querystring param to set the current value
void listenWeb() {

boolean read_url = true;
boolean unlock = false;

EthernetClient client = server.available();
if (client) {

Serial.println(“Ethernet client connected…”);

// an http request ends with a blank line
boolean current_line_is_blank = true;
int valuesChanged = 0;
while (client.connected()) {

if (client.available()) {

char c = client.read();
if (url.length() 0) && unlock) {
Serial.println(url);
String v = String(10);
int startIndex = url.indexOf(‘=’) + 1;
int stopIndex = url.indexOf(‘H’);
v = url.substring(startIndex, stopIndex);
Serial.println(v);
char buf[100];
v.toCharArray(buf, 100);
totalTicks = atoi(buf);
}

int t = tempc;

// EEML
client.println(“”);
client.println(“”);

client.println(“”);
client.println(“Ardugas Server”);
client.println(“”);

// Gas Meter Reading
client.println(“”);
client.println(“gascubic metres”);
client.print(“”);
client.print(totalTicks);
client.println(“”);
client.println(“”);

client.println(“”);
client.println(“temperaturedegreescelsius”);
client.print(“”);
client.print(t);
client.print(“”);
client.println(“”);

client.println(“”);
client.println(“”);

client.println();

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;
}

}
}
// give the web browser time to receive the data
url = “”;
delay(5);
client.stop();
}

}

// Switch the cooling fan on if it’s too hot!
void checkUnitTemp() {
if (tempc >= maxTemp) {
digitalWrite(fanPin, HIGH);
}
if (tempc > maxi) {maxi = tempc;} // record max temperature
if(tempc < mini) {mini = tempc;} // record min temperature
}

// Count sensor values
void checkSensor() {
int currentState = digitalRead(sensorPin);
if (currentState == LOW && previousState == HIGH) {
if (!lock) {
lock = true;
delay(delayMs);
totalTicks++;
}
}
if (currentState == HIGH && previousState == LOW) {
lock = false;
}
previousState = currentState;
}

Mark