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prajwal98

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  1. #ifdef OUTPUT_READABLE_WORLDACCEL #ifdef OUTPUT_READABLE_WORLDACCEL // display initial world-frame acceleration, adjusted to remove gravity // and rotated based on known orientation from quaternion mpu.dmpGetQuaternion(&q, fifoBuffer); mpu.dmpGetAccel(&aa, fifoBuffer); mpu.dmpGetGravity(&gravity, &q); mpu.dmpGetLinearAccel(&aaReal, &aa, &gravity); mpu.dmpGetLinearAccelInWorld(&aaWorld, &aaReal, &q); Serial.print("aworld\t"); Serial.print(aaWorld.x); Serial.print("\t"); Serial.print(aaWorld.y); Serial.print("\t"); Serial.println(aaWorld.z); #endif I want to ask that what is the unit of above aaWorld values ? I understand that if i need to get the acceleration without gravity i need to use these values , but the values that we get from these are in m/s^2? or do i need to do something acc_in_ms2=(aaWorld.x*9.8)/16384.0 ? or something else. my offset are as follows mpu.setXGyroOffset(220); mpu.setYGyroOffset(76); mpu.setZGyroOffset(6); mpu.setZAccelOffset(1262); and my output is as follows without doing any changes in code provided after 10-15 sec (the sensor is horizontal) aworld 0 28 60 aworld -1 29 40 aworld 5 29 33 aworld 6 24 20 aworld 2 23 22 aworld -4 13 26 aworld -6 11 28 aworld -10 11 30 aworld -15 5 38 aworld -7 -1 36 aworld 7 -4 37 aworld 7 0 33 aworld 4 5 29 aworld 0 2 30 aworld -3 -7 35 seems coreect all the values converging to zeros.. but when i move the sensor in one direction , i get totally unexpected values.. aworld -415 -306 304 aworld -505 -277 318 aworld -577 -270 399 aworld -587 -207 265 aworld -572 -166 63 aworld -589 -200 -28 aworld -631 -258 -7 aworld -638 -292 30 aworld -637 -334 29 aworld -647 -404 -23 aworld -640 -483 -75 aworld -611 -542 -72 aworld -633 -503 -24 aworld -723 -344 17 aworld -816 -125 36 aworld -908 72 1 aworld -988 241 -45 aworld -1015 378 -68 I am moving the sesor only to and fro in one direction but i am getting these values Why so? please help if you have any information /knowledge about this... I want acceleration mithout gravity affect in m/s^2
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