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WeatherShieldSample.md

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Weather Shield Sensors
/WeatherShieldSensors.htm

Weather Shield Sensors

Learn how to create a simple app that uses the Weather Shield's sensors.

Required Components

Hooking up Components

Place the weather shield on top of the Galileo board making sure to line the pins up.

Create a new project

  1. Create a new project from the template.
  2. Go to HTU21D Repo{:target="_blank"} and download the HTU21D.cpp and HTU21D.h files.
  3. Go to MPL3115A2 Repo{:target="_blank"} and download the MPL3115A2.cpp and MPL3115A2.h files.
  4. Place the HTU21D and MPL3115A2 library files in your new project.
  5. Replace the existing code in main.cpp with the following code:

Code

Main.cpp

{% highlight C++ %} /* Main.cpp : Defines the entry point for the console application. */

#include "stdafx.h" #include "HTU21D.h" #include "MPL3115A2.h"

#include "arduino.h"

MPL3115A2 myPressure; HTU21D myHumidity;

int _tmain(int argc, _TCHAR* argv []) { return RunArduinoSketch(); }

//Give me temperature in fahrenheit! float readTempF() { return((myPressure.readTemp() * 9.0) / 5.0 + 32.0); // Convert celsius to fahrenheit }

void setup() { Log(L"WeatherShieldSample\n\n");

// initialize the digital pin as an output.
Wire.begin();        // Join i2c bus

// Test Multiple slave addresses:
Wire.beginTransmission(0x40);
Wire.write(0xE7);  // Address of data to get
Wire.endTransmission(false); // Send data to I2C dev with option for a repeated start. THIS IS NECESSARY and not supported before Arduino V1.0.1!
if (Wire.requestFrom(0x40, 1) != 1)
{
    Log(L"Error reading from humidity sensor\n");
}

byte status = Wire.read();
Log(L"Humidity sensor status 0x%0x\n\n", status);

myHumidity.begin();
myPressure.begin();

// Configure the sensor
myPressure.setModeBarometer(); // Measure pressure in Pascals from 20 to 110 kPa
myPressure.setOversampleRate(7); // Set Oversample to the recommended 128
myPressure.enableEventFlags(); // Enable all three pressure and temp event flags

}

void loop() { float pressure = myPressure.readPressure(); Log(L"Pressure(Pa): %lf\n", pressure); float altitude = myPressure.readAltitudeFt(); Log(L"altitude(Ft): %lf\n", altitude); float temperature = readTempF(); Log(L"Temperature(F): %lf\n", temperature); float humidity = myHumidity.readHumidity(); Log(L"Humidity(f): %lf\n\n", humidity); } {% endhighlight %}

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