48 lines
1.1 KiB
C++
48 lines
1.1 KiB
C++
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/*
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* si7021 library
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* SI7021 Temperature and Humidity Sensor @ ESP32 i2c
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*
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* copyright: Jannik Beyerstedt | http://jannikbeyerstedt.de | code@jannikbeyerstedt.de
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* license: http://www.gnu.org/licenses/gpl-3.0.txt GPLv3 License
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*/
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#ifndef SI7021_H
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#define SI7021_H
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#include <cstdint>
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#define SI7021_DEFAULT_ADDRESS (0x40)
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#define SI7021_MEASRH_HOLD_CMD 0xE5
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#define SI7021_MEASTEMP_HOLD_CMD 0xE3
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#define SI7021_MEASRH_NOHOLD_CMD 0xF5
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#define SI7021_MEASTEMP_NOHOLD_CMD 0xF3
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#define SI7021_READPREVTEMP_CMD 0xE0
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#define SI7021_RESET_CMD 0xFE
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#define SI7021_READRHT_REG_CMD 0xE7
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// #define SI7021_WRITERHT_REG_CMD 0xE6
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// #define SI7021_READHEATER_REG_CMD 0x11
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// #define SI7021_WRITEHEATER_REG_CMD 0x51
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// #define SI7021_ID1_CMD 0xFA0F
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// #define SI7021_ID2_CMD 0xFCC9
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// #define SI7021_FIRMVERS_CMD 0x84B8
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class Si7021 {
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public:
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Si7021(void);
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bool begin(void);
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void reset(void);
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bool measure(void);
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float temperature;
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float humidity;
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private:
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// void writeRegister8(uint8_t reg, uint8_t value);
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uint8_t readRegister8(uint8_t reg);
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int8_t _i2caddr;
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};
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#endif // SI7021_H
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