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80 lines
2.7 KiB
Markdown
80 lines
2.7 KiB
Markdown
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[](https://github.com/marketplace/actions/arduino_ci)
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[](https://github.com/RobTillaart/PIR/actions/workflows/arduino-lint.yml)
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[](https://github.com/RobTillaart/PIR/actions/workflows/jsoncheck.yml)
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[](https://github.com/RobTillaart/PIR/blob/master/LICENSE)
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[](https://github.com/RobTillaart/PIR/releases)
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# PIR
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PIR library for Arduino. Supports up to 8 PIR sensors.
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## Description
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The PIR library implements a class to monitor 1 or more PIR sensors.
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The library supports up to 8 PIR sensors per object, which typically are added in **setup()**.
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It is possible to add a sensor (pin) multiple times.
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The library accepts duplicates.
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The library has two **read()** functions, one to read a specific sensor, and one to read all of them.
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The latter will return a mask indicating HIGH and LOW.
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The first added PIR will have the LSB.
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Instead of PIR sensors one can add other DigitalOut sensors or even switches.
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## Interface
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#### Base
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- **PIR()** constructor. Allocated room for 8 PIRs.
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- **uint8_t add(uint8_t pin)** adds a PIR pin to the set of pins.
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Returns the index or PIR_ARRAY_FULL (0xFE)
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- **uint8_t count** returns number of PIR sensors added.
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#### Read
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- **uint8_t read()** read all PIR sensors in the set.
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Returns a bit mask of HIGH / LOW values.
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Not used slots will return 0.
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- **uint8_t read(uint8_t index)** read a specific PIR sensor.
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Faster than read() above.
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- **uint8_t lastValue()** returns last values read (bit mask) with read().
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- **uint8_t changed()** returns bit mask of pins that changed since last read().
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This can improve processing in some cases.
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## Future
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#### Must
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- update documentation
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#### Should
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- add examples
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- interrupts?
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#### Could
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- investigate PIR16 PIR32 class that can hold more
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- think MEGA2560.
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- or dynamic allocation? 0.2.0
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- one lastRead for all?
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- **uint8_t pin(uint8_t index)** to get back configuration
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- **bool add(uint8_t array, length)** faster configuration. Return true if there was enough room.
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- **clear()** to reset whole object?
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#### Wont
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- PIR class based upon a PCF8574?
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- separate class
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- timestamp per PIR
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- lastRead, lastTriggered?
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- taking "a lot of RAM" for every pin
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- add statistics?
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- nr of calls - high% - low%
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- duration
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- investigate noise (what noise)
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- **remove(pin)**
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- difficult, more admin, expectations...
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