Difference between revisions of "Compass"

Objective

The course will show you how to simulate a compass on Processing by presenting the data of magnetic field strength detected by Microduino-10DOF module.

Equipment

• Microduino-Core
• Microduino-FT232R
• Microduino-10DOF

• Other Hardware Equipment
  • A USB cable

Schematic Diagram

The HMC5883L magnetic field strength sensor of Microduino-10DOF will be available.

Program

Referring to compassMicroduino

compass_simulator

Debugging

Step 1：Building the hardware environment according to the schematic diagram, just like this:

Step 2：Here is the code we need:

The code of the two ends (Processing and Microduino)

Microduino:

//The data of the magnetic field strength will be exported into the serial port to be displayed on Processing

 void loop()
 {
   mag.getHeading(&mx, &my, &mz);
   Serial.print(mx);
   Serial.print(",");
   Serial.println(my); 
 }

Processing:

//After getting the data of the first serial port, defining them or caching them if there is a new line // is always my Arduino, so I open Serial.list()[0].

 // Open whatever port is the one you're using.
 myPort = new Serial(this, Serial.list()[0], 9600);
 myPort.bufferUntil('\n'); // Trigger a SerialEvent on new line

//Presenting the data obtained from Microduino on the screen in the form of curves with different color and then marking them

Function Description:

//Drawing a magnetic field pointer arrow(int x1, int y1, int x2, int y2, color c)

//Judging whether can convert them into numbers isNumeric(String str)

Step 3：Uploading the code and compiling them successfully.

Step 4：After the system goes smoothly, you can use a magnet to change the magnetic field and see if there is any change.

Result

There will be a simple compass displayed on the screen and the pointer will change along with the magnetic field. As follows:

Video