Send integer on Serial to Arduino.

    Oct 16 2009 | 10:48 pm
    hey. Need some help here. Doing a project where were going to control a standard rc car using a iPhone 3g, 1 arduino (possably 2), and some RF modules. we are going to read the accelerometer data on the iphone and turning them in to throttle/turn commands.
    I've managed to get the accelerometer data in to my max-patch(8 bit) so now I have 2 8-bit integers in number boxes which i don't know how to send out on the serial port and to the arduino.
    I need help to make the rest of the patch, so that i can send the two (continuously changing) 8-bit integers to the arduino.
    Just imagine a blank patch with only two number boxes on it. the number in the boxes change continously(whole numbers, no decimals) and i want to send them to the arduino... How do i do that ? since this is real-time control, it needs do update at least 10 times a second.
    Anyone have an idea of what to do ? I think this is a pretty basic thing to do, but i have almost no experience with the max 5 program!
    thanks for reading, and thanks again for all help.
    Daniel Aaroe

    • Oct 17 2009 | 4:40 am
      Try the [serial] object, and run the integers through [itoa] before they go in. or try [spell]. Some combination should get the Arduino to recognize them. You'll have to send them as two-element lists, each with an index number that the Arduino code listens for (and then sends to the right place), or send them as a pair, with a start code for the Arduino to see. It'll take a bit of fiddling but it should be fine. The key is the formatting for [serial].
    • Oct 17 2009 | 9:10 am
      Thanks, I've looked at it, but due to my lack of skills in the program, i can't really make sense of it. It looks like the [serial] makes the "integer" to "binary". But I dont really know anything for sure.
      I'll just upload the program, and whoever wants to, can take a look. I have not tried it yet. Don't know if it does what it should. Left a few short comments there. And one long one.
    • Oct 18 2009 | 12:09 pm
      maybe this can halp you. the arduino code is not tested..
      char id; //max pak input 1( pak 0 1) int data = 0; //max pak input data (pak 0 number)
      void setup() {
      void loop()
      { while ((Serial.available() > 1)){
      id =; data =;
      if (id == 2){
      if (data != 0){ digitalWrite(12, HIGH); } else{ digitalWrite(12, LOW); }
      } if (id == 3){
      if (data != 0){ digitalWrite(13, HIGH); } else{ digitalWrite(13, LOW); } }
    • Oct 18 2009 | 12:23 pm
      Thanks. I shall look at it more closely tonight. Did'nt quite figure out where to input the two integers. Even though it might look like it was at the [pak 2.0].
      I see you made som arduino code as well. That was not necessary but I think it will help a lot when i start to write the arduino code. thanks again
    • Oct 18 2009 | 2:03 pm
      this is should be more clear:
    • Oct 18 2009 | 2:53 pm
      yes it was. will try this. thanks man
    • Oct 18 2009 | 3:51 pm
      Do i put both the data inputs in the same [pak].
      The id number, is that there to seperate the two integers from each other ?(if so, i thought i should just mux/demux the ints to send them on the same serial without identifiers)...
      sorry if the questions are stupid. I'm new at this.
      I tried that, and this is how it looks like. Think this could work? (have not used the id number box. have not muxed them either!)
    • Oct 18 2009 | 7:02 pm
      use for each data stream one [pak] object and give as first argument another id number.