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Topic: Send dynamic tweet strings via the Twitter library (Read 1 time) previous topic - next topic


Hello everyone!

I use the Twitter library that supports OAuth http://www.arduino.cc/playground/Code/TwitterLibrary and i want to post the values from a temperature sensor along with some additional text, in the same tweet.

As such, a tweet should contain a static text as well as the dynamic temperature value taken from the temp sensor.

So here is my question:

How can i concatenate a static text with a dynamic value in order to send the entire string via a single tweet ?

I test the following code taken from the Twitter library page:

Code: [Select]
/* Post a simple message to Twitter  */
#include <Ethernet.h>
#include <Twitter.h>

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
byte ip[] = { 10, 0, 0, 177 };
byte gateway[] = { 10, 0, 0, 1 };
byte subnet[] = { 255, 255, 0, 0 };

Twitter twitter("YOUR-TOKEN");
char msg[] = "Hello, World! I'm Arduino!";

void setup()
 Ethernet.begin(mac, ip, gateway, subnet);


 Serial.println("connecting ...");
 if (twitter.post(msg)) {
   int status = twitter.wait();
   if (status == 200) {
   } else {
     Serial.print("failed : code ");
 } else {
   Serial.println("connection failed.");

void loop()

In the example code above, the string array variable contains a static string
Code: [Select]
char msg[] = "Hello, World! I'm Arduino!";

The "post" function of the twitter library
Code: [Select]
twitter.post(msg) expects a const char *message variable.

What do i need to do to concatenate a static text and a dynamic value ?

Any help to the right direction is much appreciated!



Something like this:
Code: [Select]
char buffer[80];
sprintf(buffer, "Current temp: %d", tempC);



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