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JoelEB
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Updated code for new revision V12
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‎firmware/Weather_Shield_Basic/Weather_Shield_Basic.ino‎ renamed to ‎firmware/Retired HTU21D code/Weather_Shield_Basic/Weather_Shield_Basic.ino‎

File renamed without changes.

‎firmware/Weather_Shield_Weather_Station/Weather_Shield_Weather_Station.ino‎ renamed to ‎firmware/Retired HTU21D code/Weather_Shield_Weather_Station/Weather_Shield_Weather_Station.ino‎

File renamed without changes.

‎firmware/Weather_Shield_with_GPS/Weather_Shield_with_GPS.ino‎ renamed to ‎firmware/Retired HTU21D code/Weather_Shield_with_GPS/Weather_Shield_with_GPS.ino‎

File renamed without changes.

‎firmware/Weather_Shield_Basic/Weather_Shield_Basic_V12/Weather_Shield_Basic_V12.ino‎

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/*
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Weather Shield Example
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By: Nathan Seidle
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SparkFun Electronics
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Date: June 10th, 2016
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License: This code is public domain but you buy me a beer if you use this and we meet someday (Beerware license).
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This example prints the current humidity, air pressure, temperature and light levels.
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The weather shield is capable of a lot. Be sure to checkout the other more advanced examples for creating
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your own weather station.
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Updated by Joel Bartlett
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03/02/2017
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Removed HTU21D code and replaced with Si7021
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*/
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#include <Wire.h> //I2C needed for sensors
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#include "SparkFunMPL3115A2.h" //Pressure sensor - Search "SparkFun MPL3115" and install from Library Manager
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#include "SparkFun_Si7021_Breakout_Library.h" //Humidity sensor - Search "SparkFun Si7021" and install from Library Manager
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MPL3115A2 myPressure; //Create an instance of the pressure sensor
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Weather myHumidity;//Create an instance of the humidity sensor
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//Hardware pin definitions
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//-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
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const byte STAT_BLUE = 7;
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const byte STAT_GREEN = 8;
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const byte REFERENCE_3V3 = A3;
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const byte LIGHT = A1;
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const byte BATT = A2;
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//Global Variables
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//-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
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long lastSecond; //The millis counter to see when a second rolls by
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void setup()
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{
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Serial.begin(9600);
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Serial.println("Weather Shield Example");
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pinMode(STAT_BLUE, OUTPUT); //Status LED Blue
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pinMode(STAT_GREEN, OUTPUT); //Status LED Green
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pinMode(REFERENCE_3V3, INPUT);
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pinMode(LIGHT, INPUT);
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//Configure the pressure sensor
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myPressure.begin(); // Get sensor online
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myPressure.setModeBarometer(); // Measure pressure in Pascals from 20 to 110 kPa
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myPressure.setOversampleRate(7); // Set Oversample to the recommended 128
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myPressure.enableEventFlags(); // Enable all three pressure and temp event flags
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//Configure the humidity sensor
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myHumidity.begin();
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lastSecond = millis();
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Serial.println("Weather Shield online!");
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}
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void loop()
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{
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//Print readings every second
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if (millis() - lastSecond >= 1000)
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{
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digitalWrite(STAT_BLUE, HIGH); //Blink stat LED
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lastSecond += 1000;
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//Check Humidity Sensor
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float humidity = myHumidity.getRH();
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if (humidity == 998) //Humidty sensor failed to respond
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{
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Serial.println("I2C communication to sensors is not working. Check solder connections.");
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//Try re-initializing the I2C comm and the sensors
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myPressure.begin();
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myPressure.setModeBarometer();
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myPressure.setOversampleRate(7);
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myPressure.enableEventFlags();
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myHumidity.begin();
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}
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else
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{
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Serial.print("Humidity = ");
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Serial.print(humidity);
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Serial.print("%,");
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float temp_h = myHumidity.getTempF();
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Serial.print(" temp_h = ");
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Serial.print(temp_h, 2);
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Serial.print("F,");
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//Check Pressure Sensor
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float pressure = myPressure.readPressure();
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Serial.print(" Pressure = ");
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Serial.print(pressure);
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Serial.print("Pa,");
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//Check tempf from pressure sensor
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float tempf = myPressure.readTempF();
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Serial.print(" temp_p = ");
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Serial.print(tempf, 2);
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Serial.print("F,");
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//Check light sensor
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float light_lvl = get_light_level();
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Serial.print(" light_lvl = ");
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Serial.print(light_lvl);
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Serial.print("V,");
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//Check batt level
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float batt_lvl = get_battery_level();
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Serial.print(" VinPin = ");
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Serial.print(batt_lvl);
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Serial.print("V");
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Serial.println();
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}
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digitalWrite(STAT_BLUE, LOW); //Turn off stat LED
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}
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delay(100);
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}
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//Returns the voltage of the light sensor based on the 3.3V rail
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//This allows us to ignore what VCC might be (an Arduino plugged into USB has VCC of 4.5 to 5.2V)
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float get_light_level()
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{
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float operatingVoltage = analogRead(REFERENCE_3V3);
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float lightSensor = analogRead(LIGHT);
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operatingVoltage = 3.3 / operatingVoltage; //The reference voltage is 3.3V
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lightSensor = operatingVoltage * lightSensor;
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return (lightSensor);
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}
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//Returns the voltage of the raw pin based on the 3.3V rail
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//This allows us to ignore what VCC might be (an Arduino plugged into USB has VCC of 4.5 to 5.2V)
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//Battery level is connected to the RAW pin on Arduino and is fed through two 5% resistors:
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//3.9K on the high side (R1), and 1K on the low side (R2)
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float get_battery_level()
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{
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float operatingVoltage = analogRead(REFERENCE_3V3);
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float rawVoltage = analogRead(BATT);
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operatingVoltage = 3.30 / operatingVoltage; //The reference voltage is 3.3V
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rawVoltage = operatingVoltage * rawVoltage; //Convert the 0 to 1023 int to actual voltage on BATT pin
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rawVoltage *= 4.90; //(3.9k+1k)/1k - multiple BATT voltage by the voltage divider to get actual system voltage
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return (rawVoltage);
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}
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‎firmware/Weather_Shield_Basic_V12.ino/Weather_Shield_Basic_V12.ino.ino‎

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/*
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Weather Shield Example
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By: Nathan Seidle
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SparkFun Electronics
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Date: June 10th, 2016
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License: This code is public domain but you buy me a beer if you use this and we meet someday (Beerware license).
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This example prints the current humidity, air pressure, temperature and light levels.
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The weather shield is capable of a lot. Be sure to checkout the other more advanced examples for creating
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your own weather station.
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*/
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#include <Wire.h> //I2C needed for sensors
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#include "SparkFunMPL3115A2.h" //Pressure sensor - Search "SparkFun MPL3115" and install from Library Manager
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#include "SparkFun_Si7021_Breakout_Library.h" //Humidity sensor - Search "SparkFun Si7021" and install from Library Manager
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MPL3115A2 myPressure; //Create an instance of the pressure sensor
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Weather myHumidity;//Create an instance of the humidity sensor
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//Hardware pin definitions
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//-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
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const byte STAT_BLUE = 7;
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const byte STAT_GREEN = 8;
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const byte REFERENCE_3V3 = A3;
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const byte LIGHT = A1;
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const byte BATT = A2;
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//Global Variables
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//-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
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long lastSecond; //The millis counter to see when a second rolls by
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void setup()
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{
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Serial.begin(9600);
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Serial.println("Weather Shield Example");
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pinMode(STAT_BLUE, OUTPUT); //Status LED Blue
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pinMode(STAT_GREEN, OUTPUT); //Status LED Green
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pinMode(REFERENCE_3V3, INPUT);
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pinMode(LIGHT, INPUT);
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//Configure the pressure sensor
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myPressure.begin(); // Get sensor online
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myPressure.setModeBarometer(); // Measure pressure in Pascals from 20 to 110 kPa
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myPressure.setOversampleRate(7); // Set Oversample to the recommended 128
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myPressure.enableEventFlags(); // Enable all three pressure and temp event flags
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//Configure the humidity sensor
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myHumidity.begin();
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lastSecond = millis();
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Serial.println("Weather Shield online!");
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}
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void loop()
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{
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//Print readings every second
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if (millis() - lastSecond >= 1000)
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{
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digitalWrite(STAT_BLUE, HIGH); //Blink stat LED
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lastSecond += 1000;
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//Check Humidity Sensor
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float humidity = myHumidity.getRH();
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if (humidity == 998) //Humidty sensor failed to respond
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{
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Serial.println("I2C communication to sensors is not working. Check solder connections.");
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//Try re-initializing the I2C comm and the sensors
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myPressure.begin();
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myPressure.setModeBarometer();
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myPressure.setOversampleRate(7);
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myPressure.enableEventFlags();
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myHumidity.begin();
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}
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else
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{
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Serial.print("Humidity = ");
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Serial.print(humidity);
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Serial.print("%,");
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float temp_h = myHumidity.getTempF();
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Serial.print(" temp_h = ");
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Serial.print(temp_h, 2);
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Serial.print("F,");
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//Check Pressure Sensor
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float pressure = myPressure.readPressure();
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Serial.print(" Pressure = ");
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Serial.print(pressure);
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Serial.print("Pa,");
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//Check tempf from pressure sensor
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float tempf = myPressure.readTempF();
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Serial.print(" temp_p = ");
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Serial.print(tempf, 2);
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Serial.print("F,");
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//Check light sensor
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float light_lvl = get_light_level();
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Serial.print(" light_lvl = ");
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Serial.print(light_lvl);
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Serial.print("V,");
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//Check batt level
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float batt_lvl = get_battery_level();
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Serial.print(" VinPin = ");
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Serial.print(batt_lvl);
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Serial.print("V");
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Serial.println();
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}
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digitalWrite(STAT_BLUE, LOW); //Turn off stat LED
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}
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delay(100);
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}
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//Returns the voltage of the light sensor based on the 3.3V rail
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//This allows us to ignore what VCC might be (an Arduino plugged into USB has VCC of 4.5 to 5.2V)
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float get_light_level()
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{
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float operatingVoltage = analogRead(REFERENCE_3V3);
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float lightSensor = analogRead(LIGHT);
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operatingVoltage = 3.3 / operatingVoltage; //The reference voltage is 3.3V
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lightSensor = operatingVoltage * lightSensor;
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return (lightSensor);
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}
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//Returns the voltage of the raw pin based on the 3.3V rail
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//This allows us to ignore what VCC might be (an Arduino plugged into USB has VCC of 4.5 to 5.2V)
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//Battery level is connected to the RAW pin on Arduino and is fed through two 5% resistors:
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//3.9K on the high side (R1), and 1K on the low side (R2)
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float get_battery_level()
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{
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float operatingVoltage = analogRead(REFERENCE_3V3);
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float rawVoltage = analogRead(BATT);
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operatingVoltage = 3.30 / operatingVoltage; //The reference voltage is 3.3V
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rawVoltage = operatingVoltage * rawVoltage; //Convert the 0 to 1023 int to actual voltage on BATT pin
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rawVoltage *= 4.90; //(3.9k+1k)/1k - multiple BATT voltage by the voltage divider to get actual system voltage
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return (rawVoltage);
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}
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