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Arduino and Mango Step by step working example


    1. Buy or make a Arduino

    2. Download the latest Arduino software I'm using 0020. http://arduino.cc/en/Main/Software

    3. If you are using Arduino Duemilanove or a similar board that runs off USB you’ll have to install the USB drivers. You can find them in the Arduino folder you just downloaded.

    4. plug in a TMP36 temp sensor as shown here: http://tinyurl.com/plbx38
      Plug it into Analog port 3 instead of 0 as shown in the link.

    5. Grab the modbus library from http://www.tucsni.nl/jee/ModbusSlave.zip
      you should check his site http://www.tucsni.nl/jee/ he actually says to use the new version here: http://sites.google.com/site/jpmzometa/arduino-mbrt/arduino-modbus-slave
      but I havent tested it.

    6. Unzip modbusslave.zip to your_arduino_install\libraries\ModBusSlave

    7. open the arduino IDE

    8. Paste the following code:

    #include <ModbusSlave.h>
    
    //TMP36 Pin Variables
    int temperaturePin = 3; //the analog pin the TMP36's Vout (sense) pin is connected to
                            //the resolution is 10 mV / degree centigrade 
                            //(500 mV offset) to make negative temperatures an option
    int temptest = 1 ;                        
    //Arduino sketch example with 2 holding regs:
    void setup()
    {
    	  /* Modbus setup example, the master must use the same COM parameters */
    	  /* 115200 bps, 8N1, two-device network */
    //	  regs[MB_REG0]=153;
    //	  regs[MB_REG1]=456;
    
    	  init_mb_slave(115200, 'n', 0);
    }
    
    
    void loop()
    {
        /* This is all for the Modbus slave */
        start_mb_slave(MB_SLAVE, regs, MB_REGS);
    
        /* your code goes here */
     float temperature = getVoltage(temperaturePin);  //getting the voltage reading from the temperature sensor
     temperature = (((temperature - .5) * 100)*1.8) + 32;          //converting from 10 mv per degree wit 500 mV offset
                                                      //to degrees ((volatge - 500mV) times 100)
    // Serial.println(temperature);    
    // Serial.println(regs[MB_REG0]);    //printing the result
    // delay(100);       
    temptest = (temperature);
    regs[MB_REG0]=temptest;
    
    
        /* handle write event */
        if (written.num_regs) {
       ///     ....
    	  written.num_regs=0;
        }
    }  
    
    /*
     * getVoltage() - returns the voltage on the analog input defined by
     * pin
     */
    float getVoltage(int pin){
    return (analogRead(pin) * .004882814); //converting from a 0 to 1024 digital range
                                            // to 0 to 5 volts (each 1 reading equals ~ 5 millivolts
    }
    
    
    1. upload the code to your Arduino.

    2. Install Mango

    3. Create a new data source.
      [url=http://postimage.org/image/1kmj3h7pg/]image

    4. Create a new datapoint
      [url=http://postimage.org/image/1syvr8io4/]image

    5. you should now be seeing the current temperature updating every 5 seconds on your datapoint.
      You can breathe hard on your tmp36 to see the temp go up in mango.

    have fun.
    hope this helps somebody as it took me about 2 days of scouring the net to make it finally work.


  • Nice. Thanks.


  • Hello.

    I'm trying to compile the sketch buy i get an error in "init_mb_slave(...)" not declared function.

    I think that the library i've got is newer because in new examples the configuration is done in this way:

    mbs.configure(SLAVE,BAUD,PARITY,TXENPIN);

    Can you comment this issue?
    thanks


  • I would use the library here: http://www.tucsni.nl/jee/ModbusSlave.zip
    other than that I have no idea. probably question better for the arduino forums as well.


  • Sketch for new library from http://sites.google.com/site/jpmzometa/arduino-mbrt/arduino-modbus-slave

    With this code you can:
    -See the status of pin 2 in mango (MB_REG0)
    -set the status of pin 13 with mango (MB_CTRL)

    use offset 0,1,... in mango to use MB_REG0, MB_CTRL, MB_TIME,...

    
    
    #include &lt;ModbusSlave.h&gt;
    
    /* First step MBS: create an instance */
    ModbusSlave mbs;
    
    /* slave registers */
    enum {        
            MB_REG0,
            MB_CTRL,        /* Led control on, off or blink */
            MB_TIME,        /* blink time in milliseconds */
            MB_CNT,        /* count the number of blinks */
            MB_REGS	 	/* total number of registers on slave */
    };
    
    int asdf=1;
    int regs[MB_REGS];
    int ledPin = 13;
    
    
    void setup() 
    {
            
    /* the Modbus slave configuration parameters */
    const unsigned char SLAVE = 1;
    const long BAUD = 9600;
    const char PARITY = 'n';
    const char TXENPIN = 1;
    
           /* Second step MBS: configure */
          mbs.configure(SLAVE,BAUD,PARITY,TXENPIN);
    
            pinMode(ledPin, OUTPUT);
            pinMode(2,INPUT);
    }
    
    void loop()
    {
    
    
           asdf=digitalRead(2);
          regs[MB_REG0]=asdf;
    
    
      /* Third and las step MBS: update in loop*/
           mbs.update(regs, MB_REGS);
    
       if(regs[MB_CTRL]==1)
         digitalWrite(ledPin,1);
         else
         digitalWrite(ledPin,0);
    
    }
    
    

  • Nice I was struggling with setting values. Ill have to give this a try.


  • Hi,

    I have a one question. I use the modbus serial for comunication. It is script:

    #include <ModbusSlave.h>
    /* First step MBS: create an instance /
    ModbusSlave mbs;
    /
    slave registers */
    enum {

    MB_CTRL, /* Led control on, off or blink /
    MB_TIME, /
    blink time in milliseconds /
    MB_CNT, /
    count the number of blinks /
    MB_REGS /
    total number of registers on slave */

    };

    int regs[MB_REGS];
    int ledPin = 13;

    void setup()
    {

    /* the Modbus slave configuration parameters /
    const unsigned char SLAVE = 1;
    const long BAUD = 9600;
    const char PARITY = 'n';
    const char TXENPIN = 1;
    /
    Second step MBS: configure */
    mbs.configure(SLAVE,BAUD,PARITY,TXENPIN);
    pinMode(ledPin, OUTPUT);

    }

    void loop()

    {

    /* Third and las step MBS: update in loop*/

    mbs.update(regs, MB_REGS);

    if(regs[MB_CTRL]==1)

    {

    digitalWrite(ledPin,1);

    }

    else{

    digitalWrite(ledPin,0);

    }

    }


    But i want a blink effect in led and i modified the script:

    if(regs[MB_CTRL]==1)
    {
    digitalWrite(ledPin,1);
    delay(3000);
    digitalWrite(ledPin,0);
    delay(3000);
    }
    else{
    digitalWrite(ledPin,0);
    }
    }

    Well, when i set the bit 1, the led blink but it don't enter in the else.

    Anyone had the same problem with supervisory and script?

    tank's

    *sorry, my english is very weak.