Go Down

Topic: Need help with connecting 9DOF (ITG3205 ADXL345 HMC5883L) module! (Read 6822 times) previous topic - next topic



I've recently purchased this device:

And would like to ask help to connect it to Arduino.
Would be nice if somebody could guide me in the right direction.



It's a typical I2C wiring; here's a similar example. You will still need to chase down the software libraries to interface with each of your specific sensors.

Some tutorials will show a level shifter, but you do not need a level shifter with this board as it already has one.


Thanks for link.
Looks like it explains it better than any I found.


Here's photo of my Arduino and Sensors.

So hopefully I didn't mess with power!?

According to this now I have to choose to connect other things to analog or digital pins.
Still need to figure out what are they.
I would appreciate any help.


Yours follows the "classic" (as Adafruit describes it) wiring. SDA to analog pin 4 and SCL to analog pin 5.


That's for all three chips; no more wiring needed. I2C devices have a built-in address that your code (or more specifically the library to interface with the chips) will report when it's communicating with a specific chip.


Right about to test magnetometer  with this tutorial - https://www.loveelectronics.co.uk/Tutorials/8/hmc5883l-tutorial-and-arduino-library

Do I need any resistors between SDA and VCC, and SCL and VCC?


Got it working:

Code: [Select]

Setting scale to +/- 1.3 Ga
Entered scale was not valid, valid gauss values are: 0.88, 1.3, 1.9, 2.5, 4.0, 4.7, 5.6, 8.1
Setting measurement mode to continuous.
Entered scale was not valid, valid gauss values are: 0.88, 1.3, 1.9, 2.5, 4.0, 4.7, 5.6, 8.1
Raw: -93   -68   482   Scaled: -85.56   -62.56   443.44   Heading: 3.77 Radians   216.17 Degrees  
Raw: -93   -69   477   Scaled: -85.56   -63.48   438.84   Heading: 3.78 Radians   216.57 Degrees  
Raw: -94   -68   483   Scaled: -86.48   -62.56   444.36   Heading: 3.77 Radians   215.88 Degrees  

Chagrin thank you very much for help. That's a good start for me.
Understood all logic, so should be able to get data from all sensors and use it in my app.

P.S. hopefully I didn't need any resistors, as I was running it without them.


That message about being invalid,  always seems to occur.


I think that might happen due to connection/disconnection of sensor.
I was holding everything in hands - so few times sensor disconnected and shown following error few times through log.


Hello, i bought that same module
can you put your code on the forum?
i dont understand how to adress the chip from the links given on this page
do you have any datasheet ?



Sorry for delay, didn't see message updates.

Following code works with compass:
(it was copied from somewhere on internet,
don't remember the author)

Code: [Select]
#include <Wire.h>
#include <HMC5883L.h>

HMC5883L compass;

void setup()
  Serial.println("Serial started.");
  compass = HMC5883L();
  Serial.println("Setting scale to +/- 1.3 Ga");
  int error = compass.SetScale(1.3); // Set the scale of the compass.
  if(error != 0) // If there is an error, print it out.

  Serial.println("Setting measurement mode to continuous.");
  error = compass.SetMeasurementMode(Measurement_Continuous); // Set the measurement mode to Continuous
  if(error != 0) // If there is an error, print it out.

void loop()
   // Retrive the raw values from the compass (not scaled).
  MagnetometerRaw raw = compass.ReadRawAxis();
  // Retrived the scaled values from the compass (scaled to the configured scale).
  MagnetometerScaled scaled = compass.ReadScaledAxis();
  // Calculate heading when the magnetometer is level, then correct for signs of axis.
  float heading = atan2(raw.YAxis, raw.XAxis);
  // Correct for when signs are reversed.
  if(heading < 0)
    heading += 2*PI;
  // Convert radians to degrees for readability.
  float headingDegrees = heading * 180/M_PI;

  // Output the data via the serial port.
  Output(raw, scaled, heading, headingDegrees);

void Output(MagnetometerRaw raw, MagnetometerScaled scaled, float heading, float headingDegrees)
   Serial.print("   ");   
   Serial.print("   ");   
   Serial.print("   \tScaled:\t");
   Serial.print("   ");   
   Serial.print("   ");   

   Serial.print("   \tHeading:\t");
   Serial.print(" Radians   \t");
   Serial.println(" Degrees   \t");

Go Up

Please enter a valid email to subscribe

Confirm your email address

We need to confirm your email address.
To complete the subscription, please click the link in the email we just sent you.

Thank you for subscribing!

via Egeo 16
Torino, 10131