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 displayed on Processing via serial output 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 or not 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 be changed along with the change of the magnetic field. As follows: Video