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fix: correct calc to uT based on res and gain. #2

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fix: correct calc to uT based on res and gain. #2

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17 changes: 10 additions & 7 deletions Adafruit_MLX90395.cpp
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Original file line number Diff line number Diff line change
@@ -56,8 +56,10 @@ bool Adafruit_MLX90395::_init(void) {
_gain = getGain();
if (_gain == 8) { // default high field gain
_uTLSB = 7.14;
_gain_default = 8;
} else {
_uTLSB = 2.5; // medium field gain
_gain_default = 9;
}

_resolution = getResolution();
@@ -121,14 +123,15 @@ bool Adafruit_MLX90395::readMeasurement(float *x, float *y, float *z) {
yi = (rx[4] << 8) | rx[5];
zi = (rx[6] << 8) | rx[7];

*x = xi;
*y = yi;
*z = zi;
// makes a resolution correction, see DS 18.6. Sensitivity for details
*x = (float)(xi << _resolution);
*y = (float)(yi << _resolution);
*z = (float)(zi << _resolution);

// multiply by gain & LSB
*x *= gainMultipliers[_gain] * _uTLSB;
*y *= gainMultipliers[_gain] * _uTLSB;
*z *= gainMultipliers[_gain] * _uTLSB;
// multiply by current gain setting & LSB/uT
*x *= _uTLSB * gainMultipliers[_gain_default] / gainMultipliers[_gain];
*y *= _uTLSB * gainMultipliers[_gain_default] / gainMultipliers[_gain];
*z *= _uTLSB * gainMultipliers[_gain_default] / gainMultipliers[_gain];

return true;
}
1 change: 1 addition & 0 deletions Adafruit_MLX90395.h
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Original file line number Diff line number Diff line change
@@ -75,6 +75,7 @@ class Adafruit_MLX90395 : public Adafruit_Sensor {

mlx90393_res_t _resolution = MLX90395_RES_17;
uint8_t _gain = 0;
uint8_t _gain_default = 0;
float _uTLSB = 0;
int32_t _sensorID = 90395;
};