Hi, I'm trying to get the project configuration working but I have an error on line 16 of easyTransfer.cpp:

_serial->print(0x06, BYTE);

It says: "BYTE was not declared in this scope"
What do you think it could be?

Tx
Gabriele

Thank you!

Keep in mind that this is a 3.3V board. If you are connecting it to a 5V Arduino, you may want to have a look at the last link on the sparkfun site on how to connect it safely.

Not a prob, i disabled atmega internal pullup editing the twi.c file, i will use external pull up to 3.3v

Sorry for the delay, well what i can suggest you is to try isolating the problem.
Is it arduino side or computer side? if it is computer side is it a protocol problem, a live problem?

You can send the midi to a real midi instrument (an hardware one) and see what happen so that you can test arduino side.

I suppose you are sending midi over arduino integrated usb, try to use an adapter (they are really cheap), connect arduino to a midi to usb adapter wiring the midi socket to arduino this way:

http://arduino.cc/en/Tutorial/Midi

then read midi from the midi/usb interface.

Therefore there is a library that includes midi function you can find it here:

http://arduinomidilib.sourceforge.net/a00001.html#a3a80e9bd2cfdb619be91d80e8f3b7825

Good Catch!

Hi, i just discovered a way to send serial to multiple software, if you use bluetooth connection to send serial to your computer you can assign multiple serial port  to a single device, well, at least on mac osx.

Hi, i made a sensor board and i want to make it wireless using the RN 41 (http://www.sparkfun.com/products/10559). From what i understood all i need to do is to attach the Rx and TX pin to arduino's TX and RX and all i will print with Serial.print(...) will be sent over the bluetooth, so that i can read it from bluetooth serial port using the internal bluetooth module of my macbook pro is that right?

Tx
Gabriele

Well, you have to be a little bit more detailed... how do you send data to the computer?

Another option is to write a pseudo driver that read the serial from arduino, open a socket and mirror the serial data into it.
You can do it with few lines of python if you are not familiar with low level coding but with C you have more control.

Well, thanks to Fabio Varesano help i figured it out:

-Wire enable pull-ups by default so SDA-SCL lines are 5v

Reference:  http://www.varesano.net/blog/fabio/how-disable-internal-arduino-atmega-pullups-sda-and-scl-i2c-bus

-Internal pull-ups actually degrade the signal so i suggest you to disable them also with sensor that tolerate 5v voltage

Reference: http://www.dsscircuits.com/articles/effects-of-varying-i2c-pull-up-resistors.html

well, i guess you would have to better understand how these sensor work. I suggest you to read this:

http://www.starlino.com/imu_guide.html

Using this hardware is a bit more complicated than you think i use this sensors a lot, you can find a lot of well made tutorials, google fabio varesano or starlino for example.
Btw for the adxl345 you have to:

Code:

//Define byte to read:
#define ACC (0x53)           
#define A_TO_READ (6)   

// Init the sensor
writeTo(ACC, 0x2D, 0);     
writeTo(ACC, 0x2D, 16);
writeTo(ACC, 0x2D, 8);

//Use functions to get data out (following functions were made i think by fabio varesano) 

void getAccelerometerData(int * result) {
  int regAddress = 0x32;                                   //first axis-acceleration-data register on the ADXL345
  byte buff[A_TO_READ];
 
 

readFrom(ACC, regAddress, A_TO_READ, buff); //read the acceleration data from the ADXL345
 
  //each axis reading comes in 10 bit resolution, ie 2 bytes.  Least Significat Byte first!!
  //thus we are converting both bytes in to one int
  result[0] = (((int)buff[1]) << 8) | buff[0];   
  result[1] = (((int)buff[3])<< 8) | buff[2];
  result[2] = (((int)buff[5]) << 8) | buff[4];
}

//reads num bytes starting from address register on device in to buff array
void readFrom(int DEVICE, byte address, int num, byte buff[]) {
  Wire.beginTransmission(DEVICE); //start transmission to device
  Wire.send(address);        //sends address to read from
  Wire.endTransmission(); //end transmission
 
  Wire.beginTransmission(DEVICE); //start transmission to ACC
  Wire.requestFrom(DEVICE, num);    // request 6 bytes from ACC
 
  int i = 0;
  while(Wire.available())    //ACC may send less than requested (abnormal)
  {
    buff[i] = Wire.receive(); // receive a byte
    i++;
  }
  Wire.endTransmission(); //end transmission
}




//Writes val to address register on device
void writeTo(int DEVICE, byte address, byte val) {
   Wire.beginTransmission(DEVICE); //start transmission to device
   Wire.send(address);        // send register address
   Wire.send(val);        // send value to write
   Wire.endTransmission(); //end transmission
}

There are libraries for those sensors you can use if you want to simplify your work, remember the first rule of coding is not to reinvent the weel!
Cheers

Well i think i will first use a level converter on SDA-SCL and then i will do further investigation, if anyone is interested i'll post the results here

Well, i already fried a mag 3110 and i'm going to try a hmc 5883l. I didn't understand already if the 5883l from spark fun can handle 5v SDA-SCL

Hi, i'm a little bit confused about the I2C and wiring library.
I need to use a sensor witch need 3.3v both on the Vcc and on the SDA-SCL.
From what i understood arduino has an internal pull-up resistor on SDA-SCL lines therefore their voltage is 5v, is this right?
If this is right all i need to do is to disable the internal pullups and use two external pull-ups resistor between SDA-SCL and the 3.3v to have SDA-SCL running at 3.3v right?

Tx.

Gabriele

ok, done typing:

sudo python setup.py install

Hi, i'm trying to install pyserial on osx lion.
when i launch install from terminal i have this error:


MacBook-Pro-di-Gabri:pyserial-2.5 Gabri$ python setup.py install
running install
running build
running build_py
running build_scripts
running install_lib
creating /Library/Python/2.7/site-packages/serial
error: could not create '/Library/Python/2.7/site-packages/serial': Permission denied
MacBook-Pro-di-Gabri:pyserial-2.5 Gabri$


what can i do to enable permission to create the folder?

tx

Gabriele