root / arduino-1.0 / libraries / Ethernet / examples / PachubeClient / PachubeClient.ino @ 58d82c77
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/* |
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Pachube sensor client |
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|
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This sketch connects an analog sensor to Pachube (http://www.pachube.com) |
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using a Wiznet Ethernet shield. You can use the Arduino Ethernet shield, or |
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the Adafruit Ethernet shield, either one will work, as long as it's got |
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a Wiznet Ethernet module on board. |
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|
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Circuit: |
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* Analog sensor attached to analog in 0 |
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* Ethernet shield attached to pins 10, 11, 12, 13 |
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|
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created 15 March 2010 |
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updated 26 Oct 2011 |
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by Tom Igoe |
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|
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http://www.tigoe.net/pcomp/code/category/arduinowiring/873 |
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This code is in the public domain. |
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|
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*/ |
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#include <SPI.h> |
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#include <Ethernet.h> |
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|
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// assign a MAC address for the ethernet controller. |
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// Newer Ethernet shields have a MAC address printed on a sticker on the shield |
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// fill in your address here: |
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byte mac[] = { |
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0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED}; |
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|
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// fill in an available IP address on your network here, |
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// for manual configuration: |
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IPAddress ip(10,0,1,20); |
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// initialize the library instance: |
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EthernetClient client; |
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|
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long lastConnectionTime = 0; // last time you connected to the server, in milliseconds |
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boolean lastConnected = false; // state of the connection last time through the main loop |
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const int postingInterval = 10000; //delay between updates to Pachube.com |
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|
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void setup() { |
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// start serial port: |
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Serial.begin(9600); |
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// start the Ethernet connection: |
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if (Ethernet.begin(mac) == 0) { |
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Serial.println("Failed to configure Ethernet using DHCP"); |
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// no point in carrying on, so do nothing forevermore: |
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for(;;) |
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; |
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} |
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// give the ethernet module time to boot up: |
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delay(1000); |
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// start the Ethernet connection: |
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if (Ethernet.begin(mac) == 0) { |
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Serial.println("Failed to configure Ethernet using DHCP"); |
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// Configure manually: |
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Ethernet.begin(mac, ip); |
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} |
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} |
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|
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void loop() { |
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// read the analog sensor: |
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int sensorReading = analogRead(A0); |
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|
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// if there's incoming data from the net connection. |
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// send it out the serial port. This is for debugging |
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// purposes only: |
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if (client.available()) { |
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char c = client.read(); |
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Serial.print(c); |
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} |
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|
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// if there's no net connection, but there was one last time |
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// through the loop, then stop the client: |
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if (!client.connected() && lastConnected) { |
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Serial.println(); |
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Serial.println("disconnecting."); |
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client.stop(); |
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} |
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|
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// if you're not connected, and ten seconds have passed since |
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// your last connection, then connect again and send data: |
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if(!client.connected() && (millis() - lastConnectionTime > postingInterval)) { |
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sendData(sensorReading); |
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} |
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// store the state of the connection for next time through |
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// the loop: |
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lastConnected = client.connected(); |
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} |
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|
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// this method makes a HTTP connection to the server: |
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void sendData(int thisData) { |
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// if there's a successful connection: |
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if (client.connect("www.pachube.com", 80)) { |
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Serial.println("connecting..."); |
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// send the HTTP PUT request. |
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// fill in your feed address here: |
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client.print("PUT /api/YOUR_FEED_HERE.csv HTTP/1.1\n"); |
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client.print("Host: www.pachube.com\n"); |
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// fill in your Pachube API key here: |
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client.print("X-PachubeApiKey: YOUR_KEY_HERE\n"); |
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client.print("Content-Length: "); |
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|
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// calculate the length of the sensor reading in bytes: |
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int thisLength = getLength(thisData); |
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client.println(thisLength, DEC); |
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|
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// last pieces of the HTTP PUT request: |
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client.print("Content-Type: text/csv\n"); |
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client.println("Connection: close\n"); |
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|
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// here's the actual content of the PUT request: |
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client.println(thisData, DEC); |
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|
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// note the time that the connection was made: |
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lastConnectionTime = millis(); |
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} |
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else { |
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// if you couldn't make a connection: |
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Serial.println("connection failed"); |
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} |
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} |
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|
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|
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// This method calculates the number of digits in the |
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// sensor reading. Since each digit of the ASCII decimal |
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// representation is a byte, the number of digits equals |
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// the number of bytes: |
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|
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int getLength(int someValue) { |
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// there's at least one byte: |
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int digits = 1; |
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// continually divide the value by ten, |
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// adding one to the digit count for each |
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// time you divide, until you're at 0: |
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int dividend = someValue /10; |
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while (dividend > 0) { |
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dividend = dividend /10; |
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digits++; |
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} |
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// return the number of digits: |
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return digits; |
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} |
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