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0.2.0 A1301
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@ -1,33 +1,44 @@
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//
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// FILE: A1301.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.2
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// VERSION: 0.2.0
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// DATE: 2010-07-22
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// PURPOSE: Arduino library for A1301 A1302 magnetometer.
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// URL: https://github.com/RobTillaart/A1301
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#include "A1301.h"
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/////////////////////////////////////////////////////////////////////////////
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//
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// CONSTRUCTOR
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//
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HALL::HALL(uint8_t pin)
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{
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_pin = pin;
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_midPoint = 512;
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_maxADC = 1023;
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_mVStep = 5000.0 / _maxADC; // default 10 bit 5V ADC (UNO)
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_midPoint = _maxADC * 0.5; // default middle
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_prevGauss = 0;
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_lastGauss = 0;
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_mVGauss = 2.5;
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_mVStep = 5000.0 / 1023; // default 10 bit 5V ADC
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_maxADC = 1023;
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_maxGauss = 500.0;
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}
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void HALL::begin(float voltage, uint16_t steps)
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{
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_maxADC = steps;
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_mVStep = voltage / steps;
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_maxADC = steps;
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_mVStep = voltage / steps;
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_midPoint = steps * 0.5;
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}
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/////////////////////////////////////////////////////////////////////////////
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//
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// MIDPOINT
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//
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void HALL::setMidPoint(float midPoint)
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{
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_midPoint = midPoint;
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@ -40,6 +51,10 @@ float HALL::getMidPoint()
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}
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/////////////////////////////////////////////////////////////////////////////
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//
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// SENSITIVITY
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//
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void HALL::setSensitivity(float sensitivity)
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{
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_mVGauss = sensitivity;
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@ -62,6 +77,7 @@ float HALL::raw(uint8_t times)
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if (times == 0) times = 1;
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for (int i = 0; i < times; i++)
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{
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// yield();
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sum += analogRead(_pin);
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}
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if (times > 1) sum /= times;
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@ -91,6 +107,12 @@ float HALL::readExt(float raw)
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//
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// ANALYSE
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//
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bool HALL::isNull()
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{
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return (_lastGauss == 0);
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}
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bool HALL::isNorth()
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{
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return (_lastGauss > 0);
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@ -115,7 +137,10 @@ float HALL::prevGauss()
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}
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// CONVERTORs
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/////////////////////////////////////////////////////////////////////////////
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//
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// CONVERTORS
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//
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float HALL::Tesla(float Gauss)
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{
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return Gauss * 0.0001;
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@ -136,11 +161,11 @@ float HALL::uTesla(float Gauss)
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/////////////////////////////////////////////////////////////////////////////
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//
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// EXPERIMENTAL
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// SATURATION LEVEL
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//
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void HALL::setMaxGauss(uint16_t maxGauss)
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void HALL::setMaxGauss(float maxGauss)
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{
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_maxGauss = maxGauss;
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_maxGauss = abs(maxGauss);
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}
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@ -152,11 +177,16 @@ float HALL::getMaxGauss()
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bool HALL::isSaturated()
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{
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// experimental, depends on sensor? to elaborate
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return (abs(_lastGauss) >= _maxGauss);
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}
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float HALL::saturationLevel()
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{
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return 100.0 * abs(_lastGauss / _maxGauss);
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}
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/////////////////////////////////////////////////////////////////////////////
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//
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// DERIVED
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@ -2,9 +2,11 @@
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//
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// FILE: A1301.h
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.2
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// VERSION: 0.2.0
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// DATE: 2010-07-22
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// PURPOSE: Arduino library for A1301 A1302 magnetometer.
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// URL: https://github.com/RobTillaart/A1301
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// always check datasheet.
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// PIN A1301
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@ -16,7 +18,7 @@
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#include "Arduino.h"
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#define A1301_LIB_VERSION (F("0.1.2"))
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#define A1301_LIB_VERSION (F("0.2.0"))
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class HALL
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@ -27,6 +29,7 @@ public:
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// ADC parameters
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void begin(float voltage, uint16_t steps);
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// midpoint depends on ADC.
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void setMidPoint(float midPoint);
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float getMidPoint();
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@ -34,6 +37,7 @@ public:
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void setSensitivity(float sensitivity);
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float getSensitivity();
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// READ
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// times > 1 ==> more stable read / averaging.
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// uses internal ADC
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@ -42,37 +46,43 @@ public:
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// for external ADC
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float readExt(float raw);
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// ANALYSE
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bool isNull();
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bool isNorth();
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bool isSouth();
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float lastGauss();
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float prevGauss();
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// CONVERTERs
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float Tesla(float Gauss);
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float mTesla(float Gauss);
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float uTesla(float Gauss);
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// EXPERIMENTAL
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// SATURATION LEVEL = EXPERIMENTAL
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// manual override default maxGauss
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void setMaxGauss(uint16_t maxGauss);
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void setMaxGauss(float maxGauss);
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float getMaxGauss();
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bool isSaturated();
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float saturationLevel();
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protected:
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uint8_t _pin = 0;
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float _midPoint = 512;
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float _prevGauss = 0;
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float _lastGauss = 0;
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float _mVGauss = 2.5;
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float _mVStep = 5000.0 / 1023;
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uint16_t _maxADC = 1023;
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uint8_t _pin;
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float _midPoint;
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float _prevGauss;
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float _lastGauss;
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float _mVGauss;
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float _mVStep;
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uint16_t _maxADC;
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// Experimental
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float _maxGauss = 500;
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float _maxGauss;
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};
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////////////////////////////////////////////////////
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//
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// DERIVED
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@ -6,18 +6,30 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
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and this project adheres to [Semantic Versioning](http://semver.org/).
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## [0.2.0] - 2023-04-24
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- add **isNull()** is no magnetic field is detected.
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- add **saturationLevel()** returns 0..100%
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- update examples (plotter + test)
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- fix midPoint in **begin()**
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- fix constructor **maxGauss**
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- update readme.md
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- update unit test
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- update keywords.txt
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- minor edits
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----
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## [0.1.2] - 2023-03-01
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- update GitHub actions
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- update license
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- minor edits
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## [0.1.1] - 2022-12-02
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- update keywords
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- update keywords.txt
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- boolean => bool
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- add isSaturated();
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- add **isSaturated()**
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- update readme.md
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- add A1324/25/26 derived classes.
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- add A1324/A1325/A1326 derived classes.
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- update unit test
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## [0.1.0] - 2022-12-01
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@ -13,13 +13,14 @@ Arduino library for A1301 and A1302 magnetometer.
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## Description
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The A1301 and A1302 are continuous-time, ratiometric, linear
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Hall-effect sensors. They are optimized to accurately provide
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a voltage output that is proportional to an applied magnetic
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field. These devices have a quiescent output voltage that is
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50% of the supply voltage. Two output sensitivity options are
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provided: 2.5 mV/G typical for the A1301, and 1.3 mV/G
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typical for the A1302. (from datasheet)
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The A1301 and A1302 are continuous-time, Ratio-metric, linear Hall-effect sensors.
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They are optimized to accurately provide a voltage output that is proportional to
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an applied magnetic field.
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These devices have a quiescent output voltage that is 50% of the supply voltage.
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This voltage level is a.k.a. the midPoint.
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Two output sensitivity options are provided: 2.5 mV/G typical for the A1301,
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and 1.3 mV/G typical for the A1302. (from datasheet)
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The following 5 classes are supported:
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@ -54,6 +55,11 @@ Please open an issue on GitHub.
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## Interface
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```cpp
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#include "A1301.h"
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```
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#### Constructor
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- **HALL(uint8_t pin)** base class constructor.
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@ -90,7 +96,7 @@ Returns Gauss.
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Note: **raw** is an ADC measurement, not a voltage.
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Can be positive (North) or negative (South).
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Returns Gauss.
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Can also be used for testing, e.g. replay of a series of data.
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#### Analyse
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@ -101,9 +107,15 @@ Returns Gauss.
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- **float prevGauss()** returns previous measurement in Gauss.
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#### Experimental
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#### Saturation.
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- **bool isSaturated()** true when ADC (lastRead) seems to max out. Experimental for now.
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Experimental saturation level.
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- **void setMaxGauss(float maxGauss)** set the saturation level.
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If maxGauss < 0 the absolute value is set.
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- **float getMaxGauss()** returns the set saturation level.
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- **bool isSaturated()** true when ADC (lastRead) seems to max out.
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- **float saturationLevel()** returns value between 0..100%.
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#### Tesla
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@ -122,23 +134,54 @@ The examples show the basic working of the functions.
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## Future
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#### Must
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- improve documentation
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- buy hardware A1301 / A1302 / ...
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- buy hardware A1301 / A1302 / etc...
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- test with hardware (again)
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#### Should
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- plotter example
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- unit tests
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- test **isSaturated()**
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- test **isSaturated()** + **saturationLevel()**
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- limits might be sensor dependant.
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- optimize math
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- multiplications instead of divisions.
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- other constants needed?
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#### Could
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- **float findZero()** how exactly.
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- **float determineNoise()** related
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- printable interface
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- **float findZero()** how exactly => ACS712 **autoMidPoint()**
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- investigate **float determineNoise()** (set/get)
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- add examples.
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- performance read()
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- Possible compatible
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- HoneyWell - SS39ET/SS49E/SS59ET
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- HoneyWell - SS490 Series
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- temperature correction functions?
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- see datasheet.
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#### Ideas
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(thinking out loud section)
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- isEast() and isWest() meaning?
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- **isEast()** field strength is "rising" ==> lastGauss > prevGauss
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- **isWest()** field strength is "sinking" ==> lastGauss < prevGauss
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- should that be absolute or not? or just **bool isRising()**
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- **float readDelta(uint8_t times = 1)** returns the relative change.
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- atan2(prevGauss, lastGauss)?
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- angle indicates relative delta compared to magnitude and direction.
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- 45 135 degrees is no change.
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- can the strength of the signal be converted to distance?
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- for a given magnet
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- repeatability + noise.
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- influence of angle of the field-lines?
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- defaults for parameters of some functions?
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#### Won't
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- printable interface
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- does not add much.
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@ -2,6 +2,7 @@
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// FILE: A1301_demo
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// AUTHOR: Rob Tillaart
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// PURPOSE: demo A1301 A1302 magnetometer.
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// URL: https://github.com/RobTillaart/A1301
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#include "Arduino.h"
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@ -2,6 +2,7 @@
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// FILE: A1301_plotter.ino
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// AUTHOR: Rob Tillaart
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// PURPOSE: demo A1301 A1302 magnetometer.
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// URL: https://github.com/RobTillaart/A1301
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//
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// to be used with Arduino Serial plotter
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61
libraries/A1301/examples/A1301_test/A1301_test.ino
Normal file
61
libraries/A1301/examples/A1301_test/A1301_test.ino
Normal file
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//
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// FILE: A1301_test.ino
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// AUTHOR: Rob Tillaart
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// PURPOSE: demo A1301 A1302 magnetometer.
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#include "Arduino.h"
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#include "A1301.h"
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A1301 mm(A0);
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uint32_t lastTime = 0;
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void setup()
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{
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Serial.begin(115200);
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Serial.println();
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Serial.println(__FILE__);
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Serial.print("A1301_LIB_VERSION: ");
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Serial.println(A1301_LIB_VERSION);
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mm.begin(5000, 1023);
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for (float r = 505; r < 515; r += 0.5)
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{
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test(r);
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}
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Serial.println("\ndone...");
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}
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void loop()
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{
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}
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void test(float raw)
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{
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Serial.print(raw);
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Serial.print("\t");
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Serial.print(mm.readExt(raw));
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Serial.print("\t");
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Serial.print(mm.isNull());
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Serial.print("\t");
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Serial.print(mm.isNorth());
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Serial.print("\t");
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Serial.print(mm.isSouth());
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Serial.print("\t");
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Serial.print(mm.isSaturated());
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Serial.print("\t");
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Serial.print(mm.prevGauss());
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Serial.print("\t");
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Serial.print(mm.lastGauss());
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Serial.print("\t");
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Serial.print(mm.saturationLevel());
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Serial.print("\n");
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}
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// -- END OF FILE --
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@ -0,0 +1,61 @@
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//
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// FILE: A1301_test_saturation.ino
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// AUTHOR: Rob Tillaart
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// PURPOSE: demo A1301 A1302 magnetometer.
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#include "Arduino.h"
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#include "A1301.h"
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A1301 mm(A0);
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uint32_t lastTime = 0;
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void setup()
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{
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Serial.begin(115200);
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Serial.println();
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Serial.println(__FILE__);
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Serial.print("A1301_LIB_VERSION: ");
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Serial.println(A1301_LIB_VERSION);
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mm.begin(5000, 1023);
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for (float r = 0; r < 1023; r += 10)
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{
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test(r);
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}
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Serial.println("\ndone...");
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}
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||||
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void loop()
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{
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}
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void test(float raw)
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{
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Serial.print(raw);
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Serial.print("\t");
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Serial.print(mm.readExt(raw));
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Serial.print("\t");
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Serial.print(mm.isNull());
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Serial.print("\t");
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Serial.print(mm.isNorth());
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Serial.print("\t");
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Serial.print(mm.isSouth());
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Serial.print("\t");
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Serial.print(mm.isSaturated());
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Serial.print("\t");
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Serial.print(mm.prevGauss());
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Serial.print("\t");
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Serial.print(mm.lastGauss());
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Serial.print("\t");
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Serial.print(mm.saturationLevel());
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Serial.print("\n");
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}
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// -- END OF FILE --
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@ -1,8 +1,12 @@
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# Syntax Colouring Map For A1301
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# Data types (KEYWORD1)
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HALL KEYWORD1
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A1301 KEYWORD1
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A1302 KEYWORD1
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A1324 KEYWORD1
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A1325 KEYWORD1
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A1326 KEYWORD1
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# Methods and Functions (KEYWORD2)
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@ -18,6 +22,7 @@ raw KEYWORD2
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read KEYWORD2
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readExt KEYWORD2
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isNull KEYWORD2
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isNorth KEYWORD2
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isSouth KEYWORD2
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lastGauss KEYWORD2
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@ -30,6 +35,7 @@ uTesla KEYWORD2
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setMaxGauss KEYWORD2
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getMaxGauss KEYWORD2
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isSaturated KEYWORD2
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saturationLevel KEYWORD2
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# Constants (LITERAL1)
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|
@ -1,6 +1,6 @@
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{
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"name": "A1301",
|
||||
"keywords": "A1301,A1302,A1324,A1325,A1326, magnetic",
|
||||
"keywords": "A1301,A1302,A1324,A1325,A1326, magnetic, HALL",
|
||||
"description": "Arduino library for A1301, A1302, A1324, A1325, A1326 magnetometer.",
|
||||
"authors":
|
||||
[
|
||||
@ -15,7 +15,7 @@
|
||||
"type": "git",
|
||||
"url": "https://github.com/RobTillaart/A1301.git"
|
||||
},
|
||||
"version": "0.1.2",
|
||||
"version": "0.2.0",
|
||||
"license": "MIT",
|
||||
"frameworks": "arduino",
|
||||
"platforms": "*",
|
||||
|
@ -1,9 +1,9 @@
|
||||
name=A1301
|
||||
version=0.1.2
|
||||
version=0.2.0
|
||||
author=Rob Tillaart <rob.tillaart@gmail.com>
|
||||
maintainer=Rob Tillaart <rob.tillaart@gmail.com>
|
||||
sentence=Arduino library for A1301 et al magnetometer.
|
||||
paragraph=A1301, A1302, A1324, A1325, A1326, magnetic.
|
||||
paragraph=A1301, A1302, A1324, A1325, A1326, magnetic, HALL.
|
||||
category=Signal Input/Output
|
||||
url=https://github.com/RobTillaart/A1301
|
||||
architectures=*
|
||||
|
@ -3,7 +3,7 @@
|
||||
// AUTHOR: Rob Tillaart
|
||||
// DATE: 2022-12-01
|
||||
// PURPOSE: unit tests for the A1301 magnetic sensor
|
||||
// https://github.com/RobTillaart/A1301
|
||||
// URL: https://github.com/RobTillaart/A1301
|
||||
// https://www.adafruit.com/product/2857
|
||||
// https://github.com/Arduino-CI/arduino_ci/blob/master/REFERENCE.md
|
||||
//
|
||||
@ -75,7 +75,15 @@ unittest(test_midPoint)
|
||||
|
||||
H.begin(3.3, 4095);
|
||||
H.setMidPoint(2020);
|
||||
assertEqual(2020, H.getMidPoint());
|
||||
assertEqualFloat(2020, H.getMidPoint(), 0.1);
|
||||
|
||||
|
||||
H.begin(2.5, 1000);
|
||||
assertEqualFloat(500, H.getMidPoint(), 0.1);
|
||||
|
||||
|
||||
H.begin(2.5, 1023);
|
||||
assertEqualFloat(511.5, H.getMidPoint(), 0.1);
|
||||
}
|
||||
|
||||
|
||||
@ -100,10 +108,13 @@ unittest(test_read_external_ADC)
|
||||
|
||||
assertEqualFloat(-0.337494, H.readExt(1000.0), 0.01);
|
||||
assertTrue(H.isSouth());
|
||||
|
||||
assertEqualFloat(-0.176322, H.readExt(1500.0), 0.01);
|
||||
assertTrue(H.isSouth());
|
||||
|
||||
assertEqualFloat(-0.0151502, H.readExt(2000.0), 0.01);
|
||||
assertTrue(H.isSouth());
|
||||
|
||||
assertEqualFloat(0.307194, H.readExt(3000.0), 0.01);
|
||||
assertTrue(H.isNorth());
|
||||
}
|
||||
@ -114,11 +125,12 @@ unittest(test_converters)
|
||||
HALL H(4);
|
||||
|
||||
H.begin(3.3, 4095);
|
||||
H.setMidPoint(2047);
|
||||
|
||||
assertEqualFloat(0.005, H.Tesla(50), 0.01);
|
||||
assertEqualFloat(5.00, H.mTesla(50), 0.01);
|
||||
assertEqualFloat(5000, H.uTesla(50), 0.01);
|
||||
float Gauss = 50;
|
||||
|
||||
assertEqualFloat(0.005, H.Tesla(Gauss), 0.01);
|
||||
assertEqualFloat(5.00, H.mTesla(Gauss), 0.01);
|
||||
assertEqualFloat(5000, H.uTesla(Gauss), 0.01);
|
||||
}
|
||||
|
||||
|
||||
@ -127,11 +139,10 @@ unittest(test_maxGauss)
|
||||
HALL H(4);
|
||||
|
||||
H.begin(3.3, 4095);
|
||||
H.setMidPoint(2047);
|
||||
|
||||
assertEqual(500, H.getMaxGauss());
|
||||
assertEqualFloat(500, H.getMaxGauss(), 0.1);
|
||||
H.setMaxGauss(400);
|
||||
assertEqual(400, H.getMaxGauss());
|
||||
assertEqualFloat(400, H.getMaxGauss(), 0.1);
|
||||
}
|
||||
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user