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85 lines
3.1 KiB
Markdown
85 lines
3.1 KiB
Markdown
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[](https://github.com/marketplace/actions/arduino_ci)
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[](https://github.com/RobTillaart/AverageAngle/actions/workflows/arduino-lint.yml)
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[](https://github.com/RobTillaart/AverageAngle/actions/workflows/jsoncheck.yml)
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[](https://github.com/RobTillaart/AverageAngle/blob/master/LICENSE)
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[](https://github.com/RobTillaart/AverageAngle/releases)
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# AverageAngle
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Arduino library to calculate correctly the average of multiple angles.
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## Description
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AverageAngle is an class to calculate the average of angles.
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This is especially useful when angles are around 0 degrees,
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e.g. from a compass sensor or the resultant of a track.
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Example, the average angle of 359 and 1 is 0, not 179 (most of the time)
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Furthermore the AverageAngle can also include the **length (weight)** of the angle as if it is a vector.
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Default this length is set to 1 so all angles are by default of equal weight.
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Example: The average angle of 359 (length = 2) and 1 (length = 1) is 359.something not zero.
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See also **runningAngle** class.
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## Interface
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- **enum AngleType { DEGREES, RADIANS, GRADIANS } ** idem. 100 GRADIANS == 90 DEGREES.
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- **AverageAngle(AngleType type = DEGREES)** constructor defaults to degrees.
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- **uint32_t add(float alpha, float length = 1.0)** add a new angle, optional with length.
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**add()** returns the number of elements (count).
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- **void reset()** clears internal buffers.
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- **uint32_t count()** the amount of angles added.
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- **float getAverage() ** returns the average.
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- **float getTotalLength() ** the length of the resulting 'angle' when we see them as vectors.
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- **float getAverageLength()** returns the average length of the angles added.
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- **AngleType type()** returns DEGREES = 0, RADIANS = 1 or GRADIANS = 2.
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- **void setType(AngleType type)** changes type DEGREES, RADIANS or GRADIANS.
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## Gradians
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Gradians a.k.a. gon, is a less often used unit for angles.
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There are 100 gradians in a right angle. A full circle = 400 gradians.
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https://en.wikipedia.org/wiki/Gradian
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## Operation
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If you want to average 5 compass readings you can just add the angles and
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do not use the length parameter.
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```cpp
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AA.reset();
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for (int i = 0; i < 5; i++)
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{
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AA.add(compass.readHeading());
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delay(100); // e.g. compass read needs some time
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}
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Serial.println(AA.getAverage());
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```
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If you want to average a track, e.g. 5 steps North, 3 steps west etc,
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you need to include the length of each step.
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```cpp
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AA.reset();
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AA.add(90, 5); // 5 steps north
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AA.add(180, 3); // 3 steps west
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Serial.println(AA.getAverage());
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Serial.println(AA.getTotalLength());
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```
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## Future
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- Improve documentation.
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- check if other units exist to support.
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