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162 lines
4.9 KiB
C++
162 lines
4.9 KiB
C++
/*
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Cosm sensor client
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This sketch connects an analog sensor to Cosm (http://www.cosm.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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This example has been updated to use version 2.0 of the cosm.com API.
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To make it work, create a feed with a datastream, and give it the ID
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sensor1. Or change the code below to match your feed.
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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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created 15 March 2010
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updated 14 May 2012
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by Tom Igoe with input from Usman Haque and Joe Saavedra
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http://arduino.cc/en/Tutorial/CosmClient
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This code is in the public domain.
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*/
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#include <SPI.h>
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#include <Ethernet.h>
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#define APIKEY "YOUR API KEY GOES HERE" // replace your Cosm api key here
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#define FEEDID 00000 // replace your feed ID
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#define USERAGENT "My Project" // user agent is the project name
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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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// 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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// if you don't want to use DNS (and reduce your sketch size)
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// use the numeric IP instead of the name for the server:
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//IPAddress server(216,52,233,121); // numeric IP for api.cosm.com
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char server[] = "api.cosm.com"; // name address for cosm API
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unsigned 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 unsigned long postingInterval = 10L*1000L; // delay between updates to cosm.com
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// the "L" is needed to use long type numbers
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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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// DHCP failed, so use a fixed IP address:
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Ethernet.begin(mac, ip);
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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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// 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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// 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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// 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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// 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(server, 80)) {
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Serial.println("connecting...");
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// send the HTTP PUT request:
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client.print("PUT /v2/feeds/");
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client.print(FEEDID);
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client.println(".csv HTTP/1.1");
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client.println("Host: api.cosm.com");
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client.print("X-ApiKey: ");
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client.println(APIKEY);
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client.print("User-Agent: ");
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client.println(USERAGENT);
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client.print("Content-Length: ");
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// calculate the length of the sensor reading in bytes:
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// 8 bytes for "sensor1," + number of digits of the data:
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int thisLength = 8 + getLength(thisData);
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client.println(thisLength);
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// last pieces of the HTTP PUT request:
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client.println("Content-Type: text/csv");
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client.println("Connection: close");
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client.println();
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// here's the actual content of the PUT request:
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client.print("sensor1,");
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client.println(thisData);
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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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Serial.println();
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Serial.println("disconnecting.");
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client.stop();
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}
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// note the time that the connection was made or attempted:
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lastConnectionTime = millis();
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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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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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