mirror of
https://github.com/RobTillaart/Arduino.git
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163 lines
4.1 KiB
C++
163 lines
4.1 KiB
C++
#pragma once
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//
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// FILE: AM232X.h
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// AUTHOR: Rob Tillaart
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// PURPOSE: AM232X Temperature and Humidity sensor library for Arduino
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// VERSION: 0.5.0
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// URL: https://github.com/RobTillaart/AM232X
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//
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// AM232X PIN layout AM2315 COLOR
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// ============================================
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// bottom view DESCRIPTION COLOR
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// +---+
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// |o | VDD RED
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// |o | SDA YELLOW
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// |o | GND BLACK
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// |o | SCL GREY
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// +---+
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//
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// do not forget pull up resistors between SDA, SCL and VDD.
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#include "Arduino.h"
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#include "Wire.h"
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#define AM232X_LIB_VERSION (F("0.5.0"))
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#define AM232X_OK 0
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#define AM232X_ERROR_UNKNOWN -10
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#define AM232X_ERROR_CONNECT -11
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#define AM232X_ERROR_FUNCTION -12
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#define AM232X_ERROR_ADDRESS -13
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#define AM232X_ERROR_REGISTER -14
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#define AM232X_ERROR_CRC_1 -15
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#define AM232X_ERROR_CRC_2 -16
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#define AM232X_ERROR_WRITE_DISABLED -17
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#define AM232X_ERROR_WRITE_COUNT -18
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#define AM232X_MISSING_BYTES -19
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#define AM232X_READ_TOO_FAST -20
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/*
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from datasheet
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0x80: not support function code
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0x81: Read an illegal address
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0x82: write data beyond the scope
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0x83: CRC checksum error
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0x84: Write disabled
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*/
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// optionally detect out of range values.
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// occurs seldom so not enabled by default.
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// #define AM232X_VALUE_OUT_OF_RANGE
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#define AM232X_HUMIDITY_OUT_OF_RANGE -100
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#define AM232X_TEMPERATURE_OUT_OF_RANGE -101
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// allows to overrule AM232X_INVALID_VALUE e.g. to prevent spike in graphs.
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#ifndef AM232X_INVALID_VALUE
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#define AM232X_INVALID_VALUE -999
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#endif
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class AM232X
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{
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public:
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explicit AM232X(TwoWire *wire = &Wire);
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bool begin();
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// datasheet 8.2 - wake up is min 800 us max 3000 us
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bool isConnected(uint16_t timeout = 3000);
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int read();
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// lastRead is in MilliSeconds since start sketch
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uint32_t lastRead() { return _lastRead; };
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// set readDelay to 0 will reset to datasheet values
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uint16_t getReadDelay() { return _readDelay; };
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void setReadDelay(uint16_t readDelay = 0);
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// negative return values are errors
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int getModel();
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int getVersion();
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uint32_t getDeviceID();
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int getStatus();
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int getUserRegisterA();
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int getUserRegisterB();
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int setStatus(uint8_t value);
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int setUserRegisterA(int value);
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int setUserRegisterB(int value);
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float getHumidity();
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float getTemperature();
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// adding offsets works well in normal range
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// might introduce under- or overflow at the ends of the sensor range
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void setHumOffset(float offset = 0) { _humOffset = offset; };
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void setTempOffset(float offset = 0) { _tempOffset = offset; };
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float getHumOffset() { return _humOffset; };
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float getTempOffset() { return _tempOffset; };
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// suppress error values of -999 => check return value of read() instead
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bool getSuppressError() { return _suppressError; };
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void setSuppressError(bool b) { _suppressError = b; };
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bool wakeUp() { return isConnected(); };
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protected:
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uint8_t _bits[8]; // buffer to hold raw data
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float _humidity = 0.0;
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float _temperature = 0.0;
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float _humOffset = 0.0;
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float _tempOffset = 0.0;
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uint32_t _lastRead = 0;
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uint16_t _readDelay = 2000;
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bool _suppressError = false;
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int _readRegister(uint8_t reg, uint8_t cnt);
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int _writeRegister(uint8_t reg, uint8_t cnt, int16_t value);
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int _getData(uint8_t length);
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uint16_t _crc16(uint8_t *ptr, uint8_t len);
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TwoWire* _wire;
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};
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/////////////////////////////////////////////////////////////////////////////
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//
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// AM232X derived classes
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//
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class AM2320 : public AM232X
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{
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public:
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AM2320(TwoWire *wire = &Wire);
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};
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class AM2321 : public AM232X
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{
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public:
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AM2321(TwoWire *wire = &Wire);
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};
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class AM2322 : public AM232X
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{
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public:
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AM2322(TwoWire *wire = &Wire);
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};
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// -- END OF FILE --
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