===== Barometer =====

<imgcaption barometer |  MS5637 barometer/altimeter>{{ ::ms5637-30ba_600.jpg?200 |}}</imgcaption>

The Sparrow nodes are using the [[http://www.meas-spec.com/product/pressure/MS5637-02BA03.aspx|MS5637]] pressure sensor for barometric and altimeter measurements. We will use the [[https://github.com/freetronics/BaroSensor|Freetronics]] library to interface with it.

<code C>
#include <Wire.h>
#include <BaroSensor.h>
int controlPin = 7;

void setup()
{
  pinMode(controlPin, OUTPUT);  //sensor on/off control
  delay(100);
  
  digitalWrite(controlPin, LOW);
  
  Serial.begin(9600);
  BaroSensor.begin();
}

void loop()
{
  if(!BaroSensor.isOK()) {
    Serial.print("Sensor not Found/OK. Error: "); 
    Serial.println(BaroSensor.getError());
    BaroSensor.begin(); // Try to reinitialise the sensor if we can
  }
  else {
    Serial.print("Temperature: "); 
    Serial.println(BaroSensor.getTemperature());
    Serial.print("Pressure:    ");
    Serial.println(BaroSensor.getPressure());
  }
  delay(1000);
}
</code>

<note tip>The light sensor on the Sparrow node is very versatile, it can measure visibile, infrared and UV radiation. Check it [[tutorials_light|out]]!</note>