please save me,,, i am writing code to sht30 sensor for i2c communication

[Imhyeonu]

At this point, the I2C statuses all look normal. I have written code to extract temperature and humidity data values via high-resolution single-shot mode, but the data values are not being extracted correctly. Do I need to set the high-speed mode and access write, read before entering single-shot mode? I don't know what the heck is wrong.

board:NUCLEOF303K8 / sensor: SHT30DLS, gpio / i2c source and header file is no problem / i2c = fast mode

if you help me. i'm will bless to you every every every day... 

[padawan]

Ok some questions:

why do you not use the HAL_I2C_Master_Transmit ans HAL_I2C_Master_Receive?

There are some "Pullups" on SDL SCL?

The first command to the Sht3xx i send is  "WriteCommand(CMD_MEAS_POLLING_H);"

By

uint8_t sht3x::WriteCommand(etCommands command)

{

etError error; // error code

HAL_StatusTypeDef _hal;

uint8_t _sbuff[2] ={0x00, 0x00}; // Array to transmit /PE

_sbuff[0] = (command >> 8);

_sbuff[1] = (command & 0xFF);

_hal = HAL_I2C_Master_Transmit(_i2c,_adr, _sbuff, 2,1000);

_ok = _hal;

error = (etError)_ok;

return error;

}

If you read from the Sensor you have to read 3 Bytes, 2 data and CRC

or 5 bytes (2 Temp 2 Hum 1 CRC).

If you look at https://www.sensirion.com/products/downloads/?category=Humidity

in section Software Sample Code SHT3x.

I change the "i2c.h" and "i2c.c" to the STM HAL.

You can first read the serialnumber before you try to read and calculate the temp.

HTH

padawan

[padawan · Accepted solution]

Second reply

in your conv you 

calc  *Temperature = -40.0f + 125.0f * ((float)tempRaw / 65535.0f);

in the datasheet it is 

so there is a wrong formular in your source code.

padawan

[Imhyeonu]

Thank you for your response. I apologize for the delay in getting back to you.
The code I'm currently writing is intended to be written entirely in C, to build a foundation and avoid using the HAL library as much as possible. I changed the formula, thanks a lot!!!! 🙂