52 lines
1.8 KiB
C++
52 lines
1.8 KiB
C++
#ifndef DFRobot_SHT20_h
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#define DFRobot_SHT20_h
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#if defined(ARDUINO) && ARDUINO >= 100
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#include "Arduino.h"
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#else
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#include "WProgram.h"
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#endif
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#include <Wire.h>
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#define ERROR_I2C_TIMEOUT 998
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#define ERROR_BAD_CRC 999
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#define SLAVE_ADDRESS 0x40
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#define TRIGGER_TEMP_MEASURE_HOLD 0xE3
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#define TRIGGER_HUMD_MEASURE_HOLD 0xE5
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#define TRIGGER_TEMP_MEASURE_NOHOLD 0xF3
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#define TRIGGER_HUMD_MEASURE_NOHOLD 0xF5
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#define WRITE_USER_REG 0xE6
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#define READ_USER_REG 0xE7
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#define SOFT_RESET 0xFE
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#define USER_REGISTER_RESOLUTION_MASK 0x81
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#define USER_REGISTER_RESOLUTION_RH12_TEMP14 0x00
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#define USER_REGISTER_RESOLUTION_RH8_TEMP12 0x01
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#define USER_REGISTER_RESOLUTION_RH10_TEMP13 0x80
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#define USER_REGISTER_RESOLUTION_RH11_TEMP11 0x81
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#define USER_REGISTER_END_OF_BATTERY 0x40
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#define USER_REGISTER_HEATER_ENABLED 0x04
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#define USER_REGISTER_DISABLE_OTP_RELOAD 0x02
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#define MAX_WAIT 100
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#define DELAY_INTERVAL 10
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#define SHIFTED_DIVISOR 0x988000
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#define MAX_COUNTER (MAX_WAIT/DELAY_INTERVAL)
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class DFRobot_SHT20
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{
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public:
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void checkSHT20(void);
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void setResolution(byte resBits);
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void writeUserRegister(byte val);
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void initSHT20(TwoWire &wirePort = Wire);
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void showReslut(const char *prefix, int val);
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float readHumidity(void);
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float readTemperature(void);
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byte readUserRegister(void);
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private:
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TwoWire *i2cPort;
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byte checkCRC(uint16_t message_from_sensor, uint8_t check_value_from_sensor);
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uint16_t readValue(byte cmd);
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};
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#endif |