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103 lines
2.6 KiB
C++
103 lines
2.6 KiB
C++
#pragma once
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//
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// FILE: SHT31.h
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// AUTHOR: Rob Tillaart
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// VERSION: 0.3.0
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// DATE: 2019-02-08
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// PURPOSE: Arduino library for the SHT31 temperature and humidity sensor
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// https://www.adafruit.com/product/2857
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// URL: https://github.com/RobTillaart/SHT31
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//
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#include "Arduino.h"
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#include "Wire.h"
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#define SHT31_LIB_VERSION "0.3.0"
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// fields readStatus
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#define SHT31_STATUS_ALERT_PENDING (1 << 15)
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#define SHT31_STATUS_HEATER_ON (1 << 13)
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#define SHT31_STATUS_HUM_TRACK_ALERT (1 << 11)
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#define SHT31_STATUS_TEMP_TRACK_ALERT (1 << 10)
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#define SHT31_STATUS_SYSTEM_RESET (1 << 4)
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#define SHT31_STATUS_COMMAND_STATUS (1 << 1)
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#define SHT31_STATUS_WRITE_CRC_STATUS (1 << 0)
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// error codes
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#define SHT31_OK 0x00
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#define SHT31_ERR_WRITECMD 0x81
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#define SHT31_ERR_READBYTES 0x82
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#define SHT31_ERR_HEATER_OFF 0x83
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#define SHT31_ERR_NOT_CONNECT 0x84
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#define SHT31_ERR_CRC_TEMP 0x85
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#define SHT31_ERR_CRC_HUM 0x86
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#define SHT31_ERR_CRC_STATUS 0x87
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class SHT31
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{
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public:
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SHT31();
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#if defined(ESP8266) || defined(ESP32)
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bool begin(const uint8_t address, uint8_t dataPin, uint8_t clockPin);
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#endif
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bool begin(const uint8_t address);
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bool begin(const uint8_t address, TwoWire *wire);
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// blocks 15 milliseconds + actual read + math
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bool read(bool fast = true);
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// check senosr is reachable over I2C
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bool isConnected();
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// details see datasheet; summary in SHT31.cpp file
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uint16_t readStatus();
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// lastRead is in milliSeconds since start
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uint32_t lastRead() { return _lastRead; };
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bool reset(bool hard = false);
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// do not use heater for long periods,
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// use it for max 3 minutes to heat up
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// and let it cool down an equal period.
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void setHeatTimeout(uint8_t seconds);
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bool heatOn();
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bool heatOff();
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bool isHeaterOn(); // is the sensor still heating up?
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bool heatUp() { return isHeaterOn(); }; // will be obsolete in future
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float getHumidity() { return humidity; };
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float getTemperature() { return temperature; };
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// ASYNC INTERFACE
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bool requestData();
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bool dataReady();
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bool readData(bool fast = true);
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int getError(); // clears error flag
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private:
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uint8_t crc8(const uint8_t *data, uint8_t len);
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bool writeCmd(uint16_t cmd);
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bool readBytes(uint8_t n, uint8_t *val);
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TwoWire* _wire;
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uint8_t _addr;
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uint8_t _heatTimeOut; // seconds
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uint32_t _lastRead;
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uint32_t _lastRequest; // for async interface
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uint32_t _heaterStart;
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float humidity;
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float temperature;
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uint8_t _error;
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};
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// -- END OF FILE --
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