stm32duino / hts221 Goto Github PK

Dear ST Team,

First of all I hope you find yourselves healthy and well in this difficult times.

I was redirected to your Git by a helpful colleague of yours. Who pointed me to your direction to help me solve an Issue.

I am working on a project at the moment, a sort of data logger in which I am integrating an STNucleo030R8 together with the MKI141V2 Evalboard (with embedded HTS221).

I am using the Arduino IDE to program on the ST board, using the implemented Wire. h library from Arduino.

I wanted to know if you can help me get readings realistic to the European weathers (-20 to +40°C ), because at the moment I am limited to readings starting from 20°C with the attached program.
I have not Tested a maximum yet. Ideal would be if we could cover the “Industrial Operating Temperature Range” (-20°C – +85°C).

I have tried to Implement and test your DISCO_IOT_HTS221_DataLog_Terminal.ino example with no success. The serial monitor Prints out correctly "15:48:10.162 -> Hum[%]: 6553.50 | Temp[C]: 74.00" But as you can see, the values seem off.

In Summary. I Want to know if you can help me to get the desired temperature range using the following code.

`// Distributed with a free-will license.
// Use it any way you want, profit or free, provided it fits in the licenses of its associated works.
// HTS221
// This code is designed to work with the HTS221_I2CS I2C Mini Module available from ControlEverything.com.
// https://www.controleverything.com/content/Humidity?sku=HTS221_I2CS#tabs-0-product_tabset-2
/*

• This example has a min threshold of 20°C.
• OPERATING TEMPERATURE RANGES:
• Commercial: 0 °C to 45 °C
• Industrial: −20 °C to 85 °C
• [ Automotive: −40 °C to 125 °C ]
• Extended: −40 °C to 125 °C
• Military: −55 °C to 125 °C
• Guaranteed to operate over a temperature range from -40 °C to +120 °C (Automotive).
• Need to calibrate for Industrial temperature range
• see HTS221_driver.h, HTS221_driver.h, HTS221Sensor.h, HTS221Sensor.cpp, TempSensor.h, HumiditySensor.h
  */
  #include<Wire.h>

// HTS221 I2C address is 0x5F
#define Addr 0x5F

void setup()
{
// Initialise I2C communication as MASTER
Wire.begin();
// Initialise serial communication, set baud rate = 9600
Serial.begin(9600);

// Start I2C Transmission
Wire.beginTransmission(Addr);
// Select average configuration register
Wire.write(0x10);
// Temperature average samples = 256, Humidity average samples = 512
Wire.write(0x1B);
// Stop I2C Transmission
Wire.endTransmission();

// Start I2C Transmission
Wire.beginTransmission(Addr);
// Select control register13
Wire.write(0x20);
// Power ON, Continuous update, Data output rate = 1 Hz
Wire.write(0x85);
// Stop I2C Transmission
Wire.endTransmission();

Serial.println("\nSTEVAL-MKI141v2");

delay(300);
}

void loop()
{
unsigned int data[2];
unsigned int val[4];
unsigned int H0, H1, H2, H3, T0, T1, T2, T3, raw;

                                // Humidity calliberation values

for(int i = 0; i < 2; i++)
{
// Start I2C Transmission
Wire.beginTransmission(Addr);
// Send data register
Wire.write((48 + i));
// Stop I2C Transmission
Wire.endTransmission();

// Request 1 byte of data
Wire.requestFrom(Addr, 1);

// Read 1 byte of data
if(Wire.available() == 1)
{
  data[i] = Wire.read();
}

}

// Convert Humidity data
H0 = data[0] / 2;
H1 = data[1] / 2;

for(int i = 0; i < 2; i++)
{
// Start I2C Transmission
Wire.beginTransmission(Addr);
// Send data register
Wire.write((54 + i));
// Stop I2C Transmission
Wire.endTransmission();

// Request 1 byte of data
Wire.requestFrom(Addr,1);

// Read 1 byte of data
if(Wire.available() == 1)
{
  data[i] = Wire.read();
}

}
// Convert Humidity data
H2 = (data[1] * 256.0) + data[0];

for(int i = 0; i < 2; i++)
{
// Start I2C Transmission
Wire.beginTransmission(Addr);
// Send data register
Wire.write((58 + i));
// Stop I2C Transmission
Wire.endTransmission();

// Request 1 byte of data
Wire.requestFrom(Addr,1);

// Read 1 byte of data
if(Wire.available() == 1)
{
  data[i] = Wire.read();
}

}
// Convert Humidity data
H3 = (data[1] * 256.0) + data[0];

                              // Temperature callibration values

// Start I2C Transmission
Wire.beginTransmission(Addr);
// Send data register
Wire.write(0x32);
// Stop I2C Transmission
Wire.endTransmission();

// Request 1 byte of data
Wire.requestFrom(Addr,1);

// Read 1 byte of data
if(Wire.available() == 1)
{
T0 = Wire.read();
}

// Start I2C Transmission
Wire.beginTransmission(Addr);
// Send data register
Wire.write(0x33);
// Stop I2C Transmission
Wire.endTransmission();

// Request 1 byte of data
Wire.requestFrom(Addr,1);

// Read 1 byte of data
if(Wire.available() == 1)
{
T1 = Wire.read();
}

// Start I2C Transmission
Wire.beginTransmission(Addr);
// Send data register
Wire.write(0x35);
// Stop I2C Transmission
Wire.endTransmission();

// Request 1 byte of data
Wire.requestFrom(Addr, 1);

// Read 1 byte of data
if(Wire.available() == 1)
{
raw = Wire.read();
}

raw = raw & 0x0F;

// Convert the temperature callib ration values to 10-bits
T0 = ((raw & 0x03) * 256) + T0;
T1 = ((raw & 0x0C) * 64) + T1;

for(int i = 0; i < 2; i++)
{
// Start I2C Transmission
Wire.beginTransmission(Addr);
// Send data register
Wire.write((60 + i));
// Stop I2C Transmission
Wire.endTransmission();

// Request 1 byte of data
Wire.requestFrom(Addr,1);

// Read 1 byte of data
if(Wire.available() == 1)
{
  data[i] = Wire.read();
}

}

// Convert the data
T2 = (data[1] * 256.0) + data[0];

for(int i = 0; i < 2; i++)
{
// Start I2C Transmission
Wire.beginTransmission(Addr);
// Send data register
Wire.write((62 + i));
// Stop I2C Transmission
Wire.endTransmission();

// Request 1 byte of data
Wire.requestFrom(Addr,1);

// Read 1 byte of data
if(Wire.available() == 1)
{
  data[i] = Wire.read();
}

}

// Convert the data
T3 = (data[1] * 256.0) + data[0];

// Start I2C Transmission
Wire.beginTransmission(Addr);
// Send data register
Wire.write(0x28 | 0x80);
// Stop I2C Transmission
Wire.endTransmission();

// Request 4 bytes of data
Wire.requestFrom(Addr,4);

// Read 4 bytes of data
// humidity msb, humidity lsb, temp msb, temp lsb
if(Wire.available() == 4)
{
val[0] = Wire.read(); // humidity msb
val[1] = Wire.read(); // humidity lsb
val[2] = Wire.read(); // temperature msb
val[3] = Wire.read(); // temperature lsb

}

// Convert the data
float humidity = (val[1] * 256.0) + val[0];
humidity = ((1.0 * H1) - (1.0 * H0)) * (1.0 * humidity - 1.0 * H2) / (1.0 * H3 - 1.0 * H2) + (1.0 * H0);
int temp = (val[3] * 256) + val[2];
float cTemp = (((T1 - T0) / 8.0) * (temp - T2)) / (T3 - T2) + (T0 / 8.0);
float fTemp = (cTemp * 1.8 ) + 32;

if (cTemp <= 20 || cTemp > 100) {        // I set this to evade Gibberish
  Serial.println("Out of range...");

} else if (cTemp >= 20 ) {

// Output data to serial monitor
/* // Raw data
Serial.print(val[0]);
Serial.print(" \t");
Serial.print(val[1]);
Serial.print(" \t");
Serial.print(val[2]);
Serial.print(" \t");
Serial.println(val[3]);

Serial.print("Relative humidity : ");
Serial.print(humidity);
Serial.print(" % RH");
Serial.print(" | ");

Serial.print("Temperature in Celsius : ");
Serial.print(cTemp);
Serial.print(" C");
Serial.print(" | ");

Serial.print(val[2], BIN);
Serial.print(" | ");
Serial.print(val[3], BIN);
Serial.print(" | ");

Serial.print("temp total : ");
Serial.println(temp); // temperature msb + lsb
*/

// Converted data
//Serial.print("Relative humidity : ");
Serial.print(humidity);
//Serial.print(" % RH");
Serial.print("\t");

//Serial.print("Celsius");
Serial.print(cTemp);
//Serial.print(" C");
Serial.print("\t");

//Serial.print("Fahrenheit");
Serial.println(fTemp);
//Serial.println(" F");
}

delay(100);
}`

Please excuse the formatting, its the first time i leave a comment in a git.
I appreciate your time. Wish you a great week and health.

Kind Regards

Franz