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PODHT22 (sensor) to Pachube via Arduino with Ethernet shield error
 

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    <p>I'm trying to connect a DHT22 sensor to the Pachube online service. I am understanding the code and have everything wired up correctly but I get this error:</p> <pre><code>DHT22 Library Demo Requesting data at 6335 Sync Timeout </code></pre> <p>What does sync timeout mean? Is is a network problem? How could I fix this?</p> <p>Here is my code anyway:</p> <pre><code> /* Feed temperature and humidity to Pachube. Based on the following examples: Sample code from nethoncho's DHT22 library: https://github.com/nethoncho/Arduino-DHT22 Tom Igoe's PachubeClient: http://arduino.cc/en/Tutorial/PachubeCient */ #include &lt;DHT22.h&gt; #include &lt;SPI.h&gt; #include &lt;Ethernet.h&gt; // Data wire is plugged into port 7 on the Arduino // Connect a 4.7K resistor between VCC and the data pin (strong pullup) #define DHT22_PIN 2 // Setup a DHT22 instance DHT22 myDHT22(DHT22_PIN); static unsigned long lWaitMillis; // assign a MAC address for the ethernet controller. // fill in your address here: byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED}; // assign an IP address for the controller: byte ip[] = { 192,168,0,30 }; byte gateway[] = { 192,168,1,2}; byte subnet[] = { 255, 255, 255, 0 }; // The address of the server you want to connect to (pachube.com): byte server[] = { 173,203,98,29 }; // initialize the library instance: Client client(server, 80); boolean lastConnected = false; // state of the connection last time through the main loop const long postingInterval = 180000; //delay between updates to Pachube.com int backoff = 0; void setup(void) { // start serial port Serial.begin(9600); Serial.println("DHT22 Library Demo"); // start the ethernet connection: Ethernet.begin(mac, ip); // give the ethernet module time to boot up: delay(1000); lWaitMillis = millis() + 5000; } void loop() { // 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() &amp;&amp; lastConnected) { Serial.println(); Serial.println("disconnecting."); client.stop(); while(client.status() != 0) { Serial.print("Client status: "); Serial.println(client.status()); delay(5); } } // if you're not connected, and ten seconds have passed since // your last connection, then connect again and send data: if(!client.connected() &amp;&amp; (long)( millis() - lWaitMillis ) &gt;= 0 ) { if (readData()) { int temp = myDHT22.getTemperatureC(); int humidity = myDHT22.getHumidity() + .5; sendData(temp, humidity); } lWaitMillis += postingInterval; if (lWaitMillis &lt; millis()) { lWaitMillis = millis() + postingInterval; } Serial.print("Next attempt at "); Serial.println(lWaitMillis); Serial.println(); } // store the state of the connection for next time through // the loop: lastConnected = client.connected(); } boolean readData() { DHT22_ERROR_t errorCode; Serial.print("Requesting data at "); Serial.println(millis()); errorCode = myDHT22.readData(); switch(errorCode) { case DHT_ERROR_NONE: Serial.print("Got Data "); Serial.print(myDHT22.getTemperatureC()); Serial.print("C "); Serial.print(myDHT22.getHumidity()); Serial.println("%"); return true; break; case DHT_ERROR_CHECKSUM: Serial.print("check sum error "); Serial.print(myDHT22.getTemperatureC()); Serial.print("C "); Serial.print(myDHT22.getHumidity()); Serial.println("%"); break; case DHT_BUS_HUNG: Serial.println("BUS Hung "); break; case DHT_ERROR_NOT_PRESENT: Serial.println("Not Present "); break; case DHT_ERROR_ACK_TOO_LONG: Serial.println("ACK time out "); break; case DHT_ERROR_SYNC_TIMEOUT: Serial.println("Sync Timeout "); break; case DHT_ERROR_DATA_TIMEOUT: Serial.println("Data Timeout "); break; case DHT_ERROR_TOOQUICK: Serial.println("Polled too quick "); break; } return false; } // this method makes a HTTP connection to the server: void sendData(int temp, int humidity) { // if there's a successful connection: if (client.connect()) { backoff = 0; Serial.println("connecting..."); // send the HTTP PUT request. // fill in your feed address here: client.print("PUT /v2/feeds/36800.csv HTTP/1.1\n"); client.print("Host: api.pachube.com\n"); // fill in your Pachube API key here: client.print("X-PachubeApiKey: a6714b6a217827edadfd003843c03c259a08add554eda3871b844612eddc6819\n"); client.print("Content-Length: "); // calculate the length of the sensor reading in bytes: int thisLength = 2 + getLength(temp) + 2 + 2 + getLength(humidity); 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.print(0, DEC); client.print(","); client.println(temp, DEC); client.print(1, DEC); client.print(","); client.println(humidity, DEC); } else { // if you couldn't make a connection: Serial.println("connection failed, resetting."); Ethernet.begin(mac, ip); delay(1000); client.stop(); delay(1000); } } // 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 &gt; 0) { dividend = dividend /10; digits++; } // return the number of digits: return digits; } </code></pre>
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