MATLAB: Simulink and arduino connection using instrumentation control toolbox

arduinoarduino serialinstrument control too boxserial communicationsimulinkto instrument

Hello, I am trying to send data from simulink to matlab using instrumentation toolbox. I have a 'constant block' connected to a 'to instrument block '. I want to turn a couple of lights on and off. (In reality i want to do something more complex but i need arduino to receive numbers from simulink(0-180)) As of now the arduino receives a signal but the arduino is not able to understand the received signal(I know this cause the receive light turns on when i run the simulation). The arduino code i am using is shown below
/************************* Private Variables(serial reading)*****************/ unsigned long loopTime, currentTime; const int serStrLen = 30; char serInStr[ serStrLen ]; // array that will hold the serial input string /*************************************************************/ const int ledPin = 13; const int ledPin2 = 12;
int ch; // Values to send on channels (duration of pulse minus start, in microseconds)
void setup() {
 pinMode(ledPin, OUTPUT); 
  pinMode(ledPin2, OUTPUT); // Set servo pin as an output pin
  Serial.begin(9600);         // connect to the serial port
  Serial.flush();
}
void loop() {
     if( readSerialString() ) 
     {
     Serial.println(serInStr); 
     }
    ch = abs(atoi( serInStr )); 
    if (ch==5 )
    {digitalWrite(ledPin,HIGH);
     digitalWrite(ledPin2, LOW);}
   else
    {digitalWrite(ledPin2, HIGH);
     digitalWrite(ledPin, LOW);}
}
/************* Serial Reading ************************************/
uint8_t readSerialString() { if(!Serial.available()) { return 0; } delay(10); // wait a little for serial data
memset( serInStr, 0, sizeof(serInStr) ); // set it all to zero
int i = 0;
while(Serial.available() && i<serStrLen ) {
  serInStr[i] = Serial.read();   // FIXME: doesn't check buffer overrun
  i++;
}
return i;  // return number of chars read
}
The know the above code works because when I send numbers via serial monitor, it works how it is supposed to.But when i try to send number 5 via simulink, the arduino does no respond the same way.
I am guessing i have to set a particular datatype in the 'to instrument' box or the ascii format string section in the 'to instrument' box settings.
Pls Help, any help would be appreciated.

Best Answer

hi Shacks, I have a quick question for you: how did you configure your 'to instrument'? i.e. under 'hardware configuration'I am wondering if that is my problem. I am not having any luck getting the simplest toy model, a constant-connected-to-a'to instrument' model to build. I get a generic 'errors encountered while building' error.
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