dfrobot/dfrobot_sht3x

dfrobot_sht3x's Issues

Wire.requestFrom() should not be followed by Wire.endTransmission()

In the file "DFRobot_SHT3x.cpp", in the function "readData()", there is a _pWire->endTransmission() after a _pWire->requestFrom().
That _pWire->endTransmission() can be removed.
Explanation: Common-mistakes#2

How to install this library to Raspberry ?

Hello, I bought the product but could not understand how to install this library and use it with raspi & phyton ??

, first download the library to Raspberry Pi, then open the routines folder. To execute one routine, demox.py, type python demox.py on the command line. To execute the get_gyro_accel_temp_data.py routine, for example, you need to type:

I dont think this is a rich explanation, Where is routines folder ?

from DFRobot_SHT3X import *
SHT3X =  DFRobot_SHT3x(iic_addr = 0x45,bus = 1)

above is from example but of course I cant import library because i could not install it. Plus, I dont know how wiring should be ...

Any support ?

Thanks

Clock streching register cmd xith polling read method

Dear,
in your lib your are using clockstreching register to read data but your are using polling method to read byte data so in this way the sck pin of the sht3w be low and in some case it can block the i2c bus because sck is in low state... Sometimes the sht3x never pullup the sck pin.
so maybe it can be better to use polling register to read in polling mode than use mixed method.

//clock streching
#define SHT3X_CMD_GETDATA_H_CLOCKENBLED (0x2C06)// Measurement:high repeatability
#define SHT3X_CMD_GETDATA_M_CLOCKENBLED (0x2C0D)// Measurement: medium repeatability
#define SHT3X_CMD_GETDATA_L_CLOCKENBLED (0x2C10)// Measurement: low repeatability
//polling
#define SHT3X_CMD_GETDATA_POLLING_H (0x2400) // measurement: polling, high repeatability
#define SHT3X_CMD_GETDATA_POLLING_M (0x240B) // measurement: polling, medium repeatability
#define SHT3X_CMD_GETDATA_POLLING_L (0x2416) // measurement: polling, low repeatability

//Actual method
DFRobot_SHT3x::sRHAndTemp_t DFRobot_SHT3x::readTemperatureAndHumidity(eRepeatability_t repeatability)
{
uint8_t rawData[6];
uint8_t rawTemperature[3];
uint8_t rawHumidity[3];
tempRH.ERR = 0;
switch (repeatability)
{
case eRepeatability_High:
writeCommand(SHT3X_CMD_GETDATA_H_CLOCKENBLED, 2);
break;
case eRepeatability_Medium:
writeCommand(SHT3X_CMD_GETDATA_M_CLOCKENBLED, 2);
break;
case eRepeatability_Low:
writeCommand(SHT3X_CMD_GETDATA_L_CLOCKENBLED, 2);
break;
}
delay(15); //wait polling method sck state not tested !!
readData(rawData, 6);
memcpy(rawTemperature, rawData, 3);
memcpy(rawHumidity, rawData + 3, 3);
if ((checkCrc(rawTemperature) != rawTemperature[2]) || (checkCrc(rawHumidity) != rawHumidity[2]))
{
tempRH.ERR = -1;
return tempRH;
}
tempRH.TemperatureC = convertTemperature(rawTemperature);
tempRH.TemperatureF = (9 / 5) * tempRH.TemperatureC + 32;
tempRH.Humidity = convertHumidity(rawHumidity);
return tempRH;
}

install BME680 driver in Raspberry

How can I install the driver for Bosch BME680 in Raspberry?

note on compile

When compile in Visual Studio for ESP32 I get this note:
DFRobot_SHT3x.h:99: note offset of packed bit-field DFRobot_SHT3x reserved1 has changed in GCC 4.4
typedef struct {
esptool.py v3.0-dev

this part of code is something wrong in DFRobot_SHT3x.h

typedef struct {
uint8_t writeDataChecksumStatus : 1;
uint8_t commandStatus : 1;
uint8_t reserved0 : 2;
uint8_t systemResetDeteced : 1;
uint8_t reserved1 : 5;
uint8_t temperatureAlert : 1;
uint8_t humidityAlert : 1;
uint8_t reserved2 : 1;
uint8_t heaterStaus :1;
uint8_t reserved3 :1;
uint8_t alertPendingStatus :1;
}attribute ((packed)) sStatusRegister_t;

Compiling is OK but need to something change in library

Best regards

Unused parameter in `writeCommand`

size_t size is not used and should be removed imo.

void DFRobot_SHT3x::writeCommand(uint16_t cmd,size_t size)
{
  uint8_t _pBuf[2];
  _pBuf[0] = cmd >> 8;
  _pBuf[1] = cmd & 0xFF;
  delay(1);
  write(_pBuf,2);
}

setTemperatureLimitC member error in array

DFRobot_SHT3x.cpp:294:41: error: array subscript is above array bounds [-Werror=array-bounds]
     _highset = (_highset >> 7) |(limit[1] & 0xfe00);
                                         ^

Converions to F seems wrong

I am converting a program from using the Arduino library for SHT35 sensor to this one but i noticed that the F values are not correct.

From Arduino Lib
<
SHT:
RH : 74.69
T (c): 21.25
T (f): 70.25
SHT:
RH : 74.66
T (c): 21.26
T (f): 70.28
SHT:
RH : 74.65
T (c): 21.22
T (f): 70.20
SHT:
RH : 74.64
T (c): 21.21

From Single Measurement Sample using addr 44

<------------------Read adta in single measurement mode-----------------------
Ambient Temperature(°C/F):21.28 C/53.25 F Relative Humidity(%RH):74.57 %RH
Ambient Temperature(°C/F):21.28 C/53.28 F Relative Humidity(%RH):74.55 %RH
Ambient Temperature(°C/F):21.28 C/53.28 F Relative Humidity(%RH):74.52 %RH
Ambient Temperature(°C/F):21.29 C/53.29 F Relative Humidity(%RH):74.52 %RH
Ambient Temperature(°C/F):21.28 C/53.29 F Relative Humidity(%RH):74.49 %RH
Ambient Temperature(°C/F):21.29 C/53.31 F Relative Humidity(%RH):74.50 %RH
Ambient Temperature(°C/F):21.28 C/53.29 F Relative Humidity(%RH):74.50 %RH