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@jb1b84
Created August 11, 2015 07:46
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Arduino BBQ Sensor - MAX31855 K-Type Thermocouple
/*
Repeating Wifi Web client
This sketch connects to a a web server and makes a request
using an Arduino Wifi shield.
Circuit:
* Wifi shield attached to pins 10, 11, 12, 13
created 23 April 2012
modifide 31 May 2012
by Tom Igoe
http://arduino.cc/en/Tutorial/WifiWebClientRepeating
This code is in the public domain.
*/
#include <SPI.h>
#include <WiFi.h>
char ssid[] = "myhome"; // your network
char pass[] = "1234"; //your network password
int keyIndex = 0; // your network key Index number (needed only for WEP)
int status = WL_IDLE_STATUS;
// Initialize the Wifi client library
WiFiClient client;
// server address:
char server[] = "mydomain.com";
//IPAddress server(64,131,82,241);
unsigned long lastConnectionTime = 0; // last time you connected to the server, in milliseconds
boolean lastConnected = false; // state of the connection last time through the main loop
const unsigned long postingInterval = 30*1000; // delay between updates, in milliseconds
//thermocouple pins
const int CH1 = 3;
const int mDataPin = 4;
const int mClockPin = 6;
const int deviceId = 1;
const int wStatusPin = 13;
const int resetPin = 2;
String tempF;
char tempHolder[10];
void setup() {
//Initialize serial and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
// check for the presence of the shield:
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present");
// don't continue:
while(true);
}
// attempt to connect to Wifi network:
while ( status != WL_CONNECTED) {
Serial.print("Attempting to connect to SSID: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network. Change this line if using open or WEP network:
status = WiFi.begin(ssid, pass);
// wait 10 seconds for connection:
delay(10000);
}
// you're connected now, so print out the status:
printWifiStatus();
//initialize the thermocouple pins
pinMode(CH1, OUTPUT);
pinMode(mDataPin, INPUT);
pinMode(mClockPin, OUTPUT);
pinMode(wStatusPin, OUTPUT);
//pinMode(resetPin, OUTPUT);
digitalWrite(CH1, 1);
digitalWrite(mClockPin, 0);
digitalWrite(wStatusPin, HIGH);
//digitalWrite(resetPin, LOW);
}
void loop() {
// if there's incoming data from the net connection.
// send it out the serial port. This is for debugging
// purposes only:
while (client.available()) {
char c = client.read();
Serial.write(c);
}
// if there's no net connection, but there was one last time
// through the loop, then stop the client:
if (!client.connected() && lastConnected) {
Serial.println();
Serial.println("disconnecting.");
client.stop();
}
// if you're not connected, and ten seconds have passed since
// your last connection, then connect again and send data:
if(!client.connected() && (millis() - lastConnectionTime > postingInterval)) {
httpRequest();
}
// store the state of the connection for next time through
// the loop:
lastConnected = client.connected();
}
// this method makes a HTTP connection to the server:
void httpRequest() {
client.stop();
// if there's a successful connection:
if (client.connect(server, 80)) {
//get the temp
dtostrf(getTemp(CH1), 1, 2, tempHolder);
tempF = String(tempHolder);
Serial.println("connecting...");
// send the HTTP PUT request:
client.println("GET /bbq/log-temp/sir-smokealot/?temp=" + tempF + " HTTP/1.1");
client.println("Host: mydomain.com");
client.println("User-Agent: arduino-ethernet");
client.println("Connection: close");
client.println();
Serial.println(tempF);
// note the time that the connection was made:
lastConnectionTime = millis();
}
else {
// if you couldn't make a connection:
Serial.println("connection failed");
Serial.println("disconnecting.");
client.stop();
}
}
void printWifiStatus() {
// print the SSID of the network you're attached to:
Serial.print("SSID: ");
Serial.println(WiFi.SSID());
// print your WiFi shield's IP address:
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);
// print the received signal strength:
long rssi = WiFi.RSSI();
Serial.print("signal strength (RSSI):");
Serial.print(rssi);
Serial.println(" dBm");
}
float getTemp(int ch) {
unsigned long value = 0;
float temp = 0;
char bita;
digitalWrite(ch, 0);
for (int i = 0; i < 32; i++) {
digitalWrite(mClockPin, 1);
bita = digitalRead(mDataPin);
if (bita==1) value = value | 1;
digitalWrite(mClockPin, 0);
if (i != 31) value = value << 1;
}
digitalWrite(ch, 1);
value = value >> 18;
temp = (((value * 0.25) * 9) / 5) + 32;
return temp;
}
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