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Final version of project
Dependencies: FSR LSM9DS1_Library_cal USBMIDI mbed
Fork of LSM9DS1_Demo_wCal by
main.cpp
- Committer:
- 4180_1
- Date:
- 2016-02-03
- Revision:
- 0:e693d5bf0a25
- Child:
- 1:a81deeb5ba58
File content as of revision 0:e693d5bf0a25:
#include "mbed.h" #include "LSM9DS1.h" #define PI 3.14159 // Earth's magnetic field varies by location. Add or subtract // a declination to get a more accurate heading. Calculate // your's here: // http://www.ngdc.noaa.gov/geomag-web/#declination #define DECLINATION -4.94 // Declination (degrees) in Atlanta,GA. DigitalOut myled(LED1); Serial pc(USBTX, USBRX); // Calculate pitch, roll, and heading. // Pitch/roll calculations taken from this app note: // http://cache.freescale.com/files/sensors/doc/app_note/AN3461.pdf?fpsp=1 // Heading calculations taken from this app note: // http://www51.honeywell.com/aero/common/documents/myaerospacecatalog-documents/Defense_Brochures-documents/Magnetic__Literature_Application_notes-documents/AN203_Compass_Heading_Using_Magnetometers.pdf void printAttitude(float ax, float ay, float az, float mx, float my, float mz) { float roll = atan2(ay, az); float pitch = atan2(-ax, sqrt(ay * ay + az * az)); // touchy trig stuff to use arctan to get compass heading (scale is 0..360) mx = -mx; float heading; if (my == 0.0) heading = (mx < 0.0) ? 180.0 : 0.0; else heading = atan2(mx, my)*360.0/(2.0*PI); //pc.printf("heading atan=%f \n\r",heading); heading -= DECLINATION; //correct for geo location if(heading>180.0) heading = heading - 360.0; else if(heading<-180.0) heading = 360.0 + heading; else if(heading<0.0) heading = 360.0 + heading; // Convert everything from radians to degrees: //heading *= 180.0 / PI; pitch *= 180.0 / PI; roll *= 180.0 / PI; pc.printf("Pitch: %f, Roll: %f degress\n\r",pitch,roll); pc.printf("Magnetic Heading: %f degress\n\r",heading); } int main() { //LSM9DS1 lol(p9, p10, 0x6B, 0x1E); LSM9DS1 IMU(p28, p27, 0xD6, 0x3C); IMU.begin(); if (!IMU.begin()) { pc.printf("Failed to communicate with LSM9DS1.\n"); } IMU.calibrate(1); IMU.calibrateMag(0); while(1) { while(!IMU.tempAvailable()); IMU.readTemp(); while(!IMU.magAvailable(X_AXIS)); IMU.readMag(); while(!IMU.accelAvailable()); IMU.readAccel(); while(!IMU.gyroAvailable()); IMU.readGyro(); pc.printf("\nIMU Temperature = %f C\n\r",25.0 + IMU.temperature/16.0); pc.printf(" X axis Y axis Z axis\n\r"); pc.printf("gyro: %9f %9f %9f in deg/s\n\r", IMU.calcGyro(IMU.gx), IMU.calcGyro(IMU.gy), IMU.calcGyro(IMU.gz)); pc.printf("accel: %9f %9f %9f in Gs\n\r", IMU.calcAccel(IMU.ax), IMU.calcAccel(IMU.ay), IMU.calcAccel(IMU.az)); pc.printf("mag: %9f %9f %9f in gauss\n\r", IMU.calcMag(IMU.mx), IMU.calcMag(IMU.my), IMU.calcMag(IMU.mz)); printAttitude(IMU.calcAccel(IMU.ax), IMU.calcAccel(IMU.ay), IMU.calcAccel(IMU.az), IMU.calcMag(IMU.mx), IMU.calcMag(IMU.my), IMU.calcMag(IMU.mz)); myled = 1; wait(0.5); myled = 0; wait(0.5); } }