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+/*
+ Pachube sensor client
+
+ This sketch connects an analog sensor to Pachube (http://www.pachube.com)
+ using a Wiznet Ethernet shield. You can use the Arduino Ethernet shield, or
+ the Adafruit Ethernet shield, either one will work, as long as it's got
+ a Wiznet Ethernet module on board.
+
+ Circuit:
+ * Analog sensor attached to analog in 0
+ * Ethernet shield attached to pins 10, 11, 12, 13
+
+ created 15 March 2010
+ updated 4 Sep 2010
+ by Tom Igoe
+
+ http://www.tigoe.net/pcomp/code/category/arduinowiring/873
+ This code is in the public domain.
+
+ */
+
+#include <SPI.h>
+#include <Ethernet.h>
+
+// assign a MAC address for the ethernet controller.
+// Newer Ethernet shields have a MAC address printed on a sticker on the shield
+// fill in your address here:
+byte mac[] = {
+ 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
+
+// initialize the library instance:
+Client client;
+
+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 int postingInterval = 10000; //delay between updates to Pachube.com
+
+void setup() {
+ // start serial port:
+ Serial.begin(9600);
+ // start the Ethernet connection:
+ if (Ethernet.begin(mac) == 0) {
+ Serial.println("Failed to configure Ethernet using DHCP");
+ // no point in carrying on, so do nothing forevermore:
+ for(;;)
+ ;
+ }
+ // give the ethernet module time to boot up:
+ delay(1000);
+}
+
+void loop() {
+ // read the analog sensor:
+ int sensorReading = analogRead(A0);
+
+ // if there's incoming data from the net connection.
+ // send it out the serial port. This is for debugging
+ // purposes only:
+ if (client.available()) {
+ char c = client.read();
+ Serial.print(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)) {
+ sendData(sensorReading);
+ }
+ // 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 sendData(int thisData) {
+ // if there's a successful connection:
+ if (client.connect("www.pachube.com", 80)) {
+ Serial.println("connecting...");
+ // send the HTTP PUT request.
+ // fill in your feed address here:
+ client.print("PUT /api/YOUR_FEED_HERE.csv HTTP/1.1\n");
+ client.print("Host: www.pachube.com\n");
+ // fill in your Pachube API key here:
+ client.print("X-PachubeApiKey: YOUR_KEY_HERE\n");
+ client.print("Content-Length: ");
+
+ // calculate the length of the sensor reading in bytes:
+ int thisLength = getLength(thisData);
+ client.println(thisLength, DEC);
+
+ // last pieces of the HTTP PUT request:
+ client.print("Content-Type: text/csv\n");
+ client.println("Connection: close\n");
+
+ // here's the actual content of the PUT request:
+ client.println(thisData, DEC);
+
+ // note the time that the connection was made:
+ lastConnectionTime = millis();
+ }
+ else {
+ // if you couldn't make a connection:
+ Serial.println("connection failed");
+ }
+}
+
+
+// This method calculates the number of digits in the
+// sensor reading. Since each digit of the ASCII decimal
+// representation is a byte, the number of digits equals
+// the number of bytes:
+
+int getLength(int someValue) {
+ // there's at least one byte:
+ int digits = 1;
+ // continually divide the value by ten,
+ // adding one to the digit count for each
+ // time you divide, until you're at 0:
+ int dividend = someValue /10;
+ while (dividend > 0) {
+ dividend = dividend /10;
+ digits++;
+ }
+ // return the number of digits:
+ return digits;
+}
+