Skip to content

Data Values are far off #7

@trawinlegacy

Description

@trawinlegacy

Board: Wio LTE Cat. 1

Values:
Altitude : 1027.88 m
Pressure : 89.58 kPa
Temperature in Celsius : 245.81 C
Temperature in Fahrenheit : 474.46 F

When the altitude should be 443 m and temperature should be 17 C.

`// 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.
// MPL3115A2
// This code is designed to work with the MPL3115A2_I2CS I2C Mini Module available from ControlEverything.com.
// https://www.controleverything.com/content/Analog-Digital-Converters?sku=MPL3115A2_I2CS#tabs-0-product_tabset-2

#include <Wire.h>
#include <WioLTEforArduino.h>
#include <WioLTEClient.h>

// MPL3115A2 I2C address is 0x60(96)
#define Addr 0x60

WioLTE Wio;

void setup()
{
SerialUSB.println("### I/O Initialize.");
Wio.Init();

SerialUSB.println("### Power supply ON.");
Wio.PowerSupplyLTE(true);
delay(500);
Wio.TurnOnOrReset();

// Initialise I2C communication
Wire.begin();
// Initialise Serial Communication, set baud rate = 9600
SerialUSB.begin(9600);

// Start I2C transmission
Wire.beginTransmission(Addr);
// Select control register
Wire.write(0x26);
// Active mode, OSR = 128, altimeter mode
Wire.write(0xB9);
// Stop I2C transmission
Wire.endTransmission();

// Start I2C transmission
Wire.beginTransmission(Addr);
// Select data configuration register
Wire.write(0x13);
// Data ready event enabled for altitude, pressure, temperature
Wire.write(0x07);
// Stop I2C transmission
Wire.endTransmission();
delay(300);

}

void loop()
{
unsigned int data[6];

// Start I2C transmission
Wire.beginTransmission(Addr);
// Select control register
Wire.write(0x26);
// Active mode, OSR = 128, altimeter mode
Wire.write(0xB9);
// Stop I2C transmission
Wire.endTransmission();
delay(1000);

// Start I2C transmission
Wire.beginTransmission(Addr);
// Select data register
Wire.write(0x00);
// Stop I2C transmission
Wire.endTransmission();

// Request 6 bytes of data
Wire.requestFrom(Addr, 6);

// Read 6 bytes of data from address 0x00(00)
// status, tHeight msb1, tHeight msb, tHeight lsb, temp msb, temp lsb
if (Wire.available() == 6)
{
data[0] = Wire.read();
data[1] = Wire.read();
data[2] = Wire.read();
data[3] = Wire.read();
data[4] = Wire.read();
data[5] = Wire.read();
}

// Convert the data to 20-bits
int tHeight = (((data[1] * 65536) + (data[2] * 256) + (data[3] & 0xF0)) / 16);
int temp = ((data[4] * 256) + (data[5] & 0xF0)) / 16;
float altitude = tHeight / 16.0;
float cTemp = (temp / 16.0);
float fTemp = cTemp * 1.8 + 32;

// Start I2C transmission
Wire.beginTransmission(Addr);
// Select control register
Wire.write(0x26);
// Active mode, OSR = 128, barometer mode
Wire.write(0x39);
// Stop I2C transmission
Wire.endTransmission();
delay(1000);

// Start I2C transmission
Wire.beginTransmission(Addr);
// Select data register
Wire.write(0x00);
// Stop I2C transmission
Wire.endTransmission();

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

// Read 4 bytes of data
// status, pres msb1, pres msb, pres lsb
if (Wire.available() == 4)
{
data[0] = Wire.read();
data[1] = Wire.read();
data[2] = Wire.read();
data[3] = Wire.read();
}

// Convert the data to 20-bits
long pres = (((long)data[1] * (long)65536) + (data[2] * 256) + (data[3] & 0xF0)) / 16;
float pressure = (pres / 4.0) / 1000.0;

// Output data to serial monitor
SerialUSB.print("Altitude : ");
SerialUSB.print(altitude);
SerialUSB.println(" m");
SerialUSB.print("Pressure : ");
SerialUSB.print(pressure);
SerialUSB.println(" kPa");
SerialUSB.print("Temperature in Celsius : ");
SerialUSB.print(cTemp);
SerialUSB.println(" C");
SerialUSB.print("Temperature in Fahrenheit : ");
SerialUSB.print(fTemp);
SerialUSB.println(" F");
delay(500);
}`

Metadata

Metadata

Assignees

No one assigned

    Labels

    No labels
    No labels

    Type

    No type

    Projects

    No projects

    Milestone

    No milestone

    Relationships

    None yet

    Development

    No branches or pull requests

    Issue actions