SparkFun Weather Shield

For use with Johnny-Five.

• SparkFun Weather Shield DEV-13956, 13956 (Current)

  • Humidity/Temperature Sensor - Si7021
  • Barometric Pressure - MPL3115A2
  • Light Sensor - ALS-PT19

• SparkFun Weather Shield DEV-12081, 12081 (Retired)

  • Humidity/Temperature Sensor - HTU21D
  • Barometric Pressure - MPL3115A2
  • Light Sensor - ALS-PT19

• SparkFun Photon Weather Shield DEV-13674, 13674 (Current)

  • Humidity/Temperature Sensor - Si7021

  • Barometric Pressure - MPL3115A2

• SparkFun Photon Weather Shield DEV-13630, 13630 (Retired)

  • Humidity/Temperature Sensor - HTU21D
  • Barometric Pressure - MPL3115A2

API & Documentation

For use with Particle Photon:

npm install johnny-five particle-io j5-sparkfun-weather-shield

For use with Arduino:

npm install johnny-five j5-sparkfun-weather-shield

Weather

The Weather class constructs objects that represent the built-in components of the shield.

• Explicit Initialization, defaults "data" to 25ms intervals

  const weather = new Weather({
    variant: "DEV-13956",
  });
  
  ...or...
  
  const weather = new Weather({
    variant: "DEV-13674",
  });
  

• Explicit Initialization, specify "data" to 200ms intervals

  const weather = new Weather({
    variant: "DEV-13956",
    period: 200
  });
  
  ...or...
  
  const weather = new Weather({
    variant: "DEV-13674",
    period: 200
  });
  

Parameters

Property	Type	Value(s)/Description	Default	Required	Version
variant	string	"ARDUINO", "PHOTON"	no	yes	v0.1.0-v1.0.0
variant	string or number	See Variants	no	yes	v2.0.0+
elevation	number	Base elevation in meters (You can use whatismyelevation.com to find out the base elevation for your location)		yes *	yes
freq	number	Use period	25 (ms)	no	v0.1.0-v1.0.0
period	number	Milliseconds. The rate in milliseconds to emit the data event	25 (ms)	no	v2.0.0+

* If elevation is omitted, the value of the feet and meters properties will be null. When elevation is included, there is a 3 second calibration window before all values are reported.

Variants

Shield	Product Name	Variant Values	Retired ?
	SparkFun Weather Shield	"DEV-13956", "DEV13956", 13956	No
	SparkFun Weather Shield	"DEV-12081", "DEV12081", 12081	Yes
	SparkFun Photon Weather Shield	"DEV-13674", "DEV13674", 13674	No
	SparkFun Photon Weather Shield	"DEV-13630", "DEV13630", 13630	Yes

Using the Arduino shield

(Without a specified elevation)

const five = require("johnny-five");
const Weather = require("j5-sparkfun-weather-shield")(five);
const board = new five.Board();

board.on("ready", () => {
  const weather = new Weather({
    variant: "DEV-13956",
    period: 200
  });

  weather.on("data", () => {
    const {
      celsius,
      fahrenheit,
      kelvin,
      pressure,
      relativeHumidity,
      lightLevel
    } = weather;

    console.log("celsius: %d°C", celsius);
    console.log("fahrenheit: %d°F", fahrenheit);
    console.log("kelvin: %d°K", kelvin);
    console.log("pressure: %d kPa", pressure);
    console.log("relativeHumidity: %d RH", relativeHumidity);
    console.log("lightLevel: %d%", lightLevel);
    console.log("----------------------------------------");
  });
});

(With a specified elevation)

const five = require("johnny-five");
const Weather = require("j5-sparkfun-weather-shield")(five);
const board = new five.Board();

board.on("ready", () => {
  const weather = new Weather({
    variant: "DEV-13956",
    period: 200, 
    // Set your base elevation with a value in meters,
    // as reported by http://www.whatismyelevation.com/.
    // `5` is the elevation (meters) of the
    // Bocoup office in downtown Boston
    elevation: 5,
  });

  // Including elevation for altitude readings will
  // incure an additional 3 second calibration time.
  weather.on("data", () => {
    const {
      celsius,
      fahrenheit,
      kelvin,
      pressure,
      feet,
      meters,
      relativeHumidity,
      lightLevel
    } = weather;

    console.log("celsius: %d°C", celsius);
    console.log("fahrenheit: %d°F", fahrenheit);
    console.log("kelvin: %d°K", kelvin);
    console.log("pressure: %d kPa", pressure);
    console.log("feet: %d'", feet);
    console.log("meters: %d", meters);
    console.log("relativeHumidity: %d RH", relativeHumidity);
    console.log("lightLevel: %d%", lightLevel);
    console.log("----------------------------------------");
  });
});

Using the Photon shield

(Without a specified elevation)

const Particle = require("particle-io");
const five = require("johnny-five");
const Weather = require("j5-sparkfun-weather-shield")(five);
const board = new five.Board({
  io: new Particle({
    token: process.env.PARTICLE_TOKEN,
    deviceId: process.env.PARTICLE_PHOTON_DEVICE_ID
  })
});

board.on("ready", function() {
  var weather = new Weather({
    variant: "DEV-13674",
    period: 200
  });

  weather.on("data", () => {
    const {
      celsius,
      fahrenheit,
      kelvin,
      pressure,
      relativeHumidity,
      lightLevel
    } = weather;

    console.log("celsius: %d°C", celsius);
    console.log("fahrenheit: %d°F", fahrenheit);
    console.log("kelvin: %d°K", kelvin);
    console.log("pressure: %d kPa", pressure);
    console.log("relativeHumidity: %d RH", relativeHumidity);
    console.log("lightLevel: %d%", lightLevel);
    console.log("----------------------------------------");
  });
});

(With a specified elevation)

const Particle = require("particle-io");
const five = require("johnny-five");
const Weather = require("j5-sparkfun-weather-shield")(five);
const board = new five.Board({
  io: new Particle({
    token: process.env.PARTICLE_TOKEN,
    deviceId: process.env.PARTICLE_PHOTON_DEVICE_ID
  })
});

board.on("ready", () => {
  const weather = new Weather({
    variant: "DEV-13674",
    period: 200,
    // Set your base elevation with a value in meters,
    // as reported by http://www.whatismyelevation.com/.
    // `5` is the elevation (meters) of the
    // Bocoup office in downtown Boston
    elevation: 5,  
  });

  // Including elevation for altitude readings will
  // incure an additional 3 second calibration time.
  weather.on("data", () => {
    const {
      celsius,
      fahrenheit,
      kelvin,
      pressure,
      feet,
      meters,
      relativeHumidity,
      lightLevel
    } = weather;

    console.log("celsius: %d°C", celsius);
    console.log("fahrenheit: %d°F", fahrenheit);
    console.log("kelvin: %d°K", kelvin);
    console.log("pressure: %d kPa", pressure);
    console.log("feet: %d'", feet);
    console.log("meters: %d", meters);
    console.log("relativeHumidity: %d RH", relativeHumidity);
    console.log("lightLevel: %d%", lightLevel);
    console.log("----------------------------------------");
  });
});

Convenient serialization for data payloads:

const weather = new Weather({
  variant: ...
});

weather.on("data", () => {
  console.log(JSON.stringify(weather, null, 2));
});

Produces:

{
  "celsius": 24,
  "fahrenheit": 75.2,
  "kelvin": 297.15,
  "pressure": 125.5,
  "feet": 3.28,
  "meters": 1,
  "relativeHumidity": 48,
  "lightLevel": 50
}

Since the Photon shield does not include the ALS-PT19 light sensor, the lightLevel property will always be null for that variant.

NOTE

The examples shown here are provided for illustration and do no specifically indicate variant support. This component class is expected to work with any variant that has I2C support.