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73 lines
2.7 KiB
Markdown
73 lines
2.7 KiB
Markdown
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[](https://github.com/marketplace/actions/arduino_ci)
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[](https://github.com/RobTillaart/MINMAX/actions/workflows/arduino-lint.yml)
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[](https://github.com/RobTillaart/MINMAX/actions/workflows/jsoncheck.yml)
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[](https://github.com/RobTillaart/MINMAX/blob/master/LICENSE)
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[](https://github.com/RobTillaart/MINMAX/releases)
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# MINMAX
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Library for finding peaks (minimum and maximum) in signal.
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## Description
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The MINMAX library is a simple peak finder in a stream of floats.
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It indicates if after adding a number the minimum and/or the maximum value has been changed by means of a bit flag that is returned. If a peak is found, it will be used as the new reference until a reset.
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The library can reset the minimum and maximum to 0 to start again.
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The library has also the option to auto-reset after a predefined number of **add()** calls.
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## Interface
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- **MINMAX** Constructor
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- **uint8_t add(float value)** add next value. Returns status (bit flags), see table below.
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- **void reset()** resets the minimum and maximum to 0.
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- **void setAutoResetCount(uint32_t count)** sets an auto-reset moment after count calls to **add()**.
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There will be at least one value processed.
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- **uint32_t getAutoResetCount()** returns set value.
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- **float minimum()** returns last minimum. Can be higher than previous call due to **reset()** or **autoReset()**.
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If no call to **add()** is made it will return 0.
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- **float maximum()** returns last maximum. Can be lower than previous call due to **reset()** or **autoReset()**.
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If no call to **add()** is made it will return 0.
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- **uint32_t count()** returns number of **add()** calls since last (auto)reset.
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Return values of **add()**
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| flag | description |
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|:----:|:----------------|
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| 0x00 | no change |
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| 0x01 | minimum changed |
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| 0x02 | maximum changed |
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| 0x80 | reset done |
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## Obsolete
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- **void autoReset(uint32_t count)** obsolete, replaced by **void setAutoResetCount()**
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## Operation
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The examples show the basic working of the functions.
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## Future
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- update documentation.
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- define FLAGS
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- add call back functions?
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- thresholds, windowing + triggers (separate class?)
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- auto-reset after time? (would affect all functions ?)
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- need a uint32_t start;
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- need a uint32_t threshold;
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- millis() - start > threshold) => action.
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-
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