Data Values are far off
trawinlegacy opened this issue · comments
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);
}`