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[on:]

Hello all  - I'm quite new to Arduino programming and am having issues with datatypes, concatenating values and Serial.write.  My project will read the values from a joystick and send the values via an xbee to a robot, receiving it via another xbee.  My goal is to read the values of the joystick, concatenate the 3 values into a string, and send that value to my robot.

When I send a test string to the robot such as:

Code:

Serial.print("600 601 602");
Serial.write("\n");

The receiving code is able to successfully extract the 3 numbers.

My issue is how to use the proper data types and concatenation to read the joystick values and send a similarly formatted value to "Serial.print". The following code seems to convert the numbers into their ascii values

Code:

//  Serial.print(analogRead(0)); //Read the position of the joysticks X axis and print it on the serial port
//  Serial.print(" ");
//  Serial.print(analogRead(1)); //Read the position of the joysticks Y axis and print it on the serial port
//  Serial.print(" ");
//  Serial.print(digitalRead(8)); //Read the position of the select button and print it on the serial port
//  Serial.print("\n");

So my question, poorly worded, is how do I read the 3 values and send it in the same format as my testing sample above?

Thanks for any help or direction,

Todd

[Reply #1 on:]

This should do. It reads the analog pins and then compiles the integer values into a string as you had before.

Code:

char buffer[16] = {0}
int x = analogRead(0);
int y = analogRead(1);
int select = analogRead(8);
sprintf(buffer,"%d %d %d\n",x,y,select );
Serial.print(buffer);

(Oh, and just to mention, for your original code, this is a shorter equivalent:

Code:

Serial.print("600 601 602\n");

)

[Reply #2 on:]

Excellent!  Thanks for your help.  It makes perfect sense now that I look at it :-)

Todd