Hi Everyone,
I’m having some trouble writing some of my first code. I wanted to create a weather station, using the photon, and the sparkfun weathershield, and upload the data to wunderground,
I currently have it “working” but I have a couple of problems and hoping someone can assist.
1.) I can’t get the wind direction to publish to wunderground.com. (Note, I did have to mount the weather station “backwards” (North is South, and East is West)
2.) I do get winds peed results published to wunderground…but they are not correct. I know this because the wind constantly blows at about 10-20 on top of the hill where I have it mounthed.
I modified the sparkfun code that they provide in the tutorial, and habe been modifyingit heavily (taking out alot, trying to troubleshoot)
Hoping some one an lend a hand and help out:
~Clayton
Code below from web build.particle;
// This #include statement was automatically added by the Particle IDE.
#include "SparkFun_Photon_Weather_Shield_Library/SparkFun_Photon_Weather_Shield_Library.h"
#include "math.h" //For Dew Point Calculation
/******************************************************************************
SparkFun_Photon_Weather_Basic_Soil_Meters.ino
SparkFun Photon Weather Shield basic example with soil moisture and temp
and weather meter readings including wind speed, wind direction and rain.
Joel Bartlett @ SparkFun Electronics
Original Creation Date: May 18, 2015
Based on the Wimp Weather Station sketch by: Nathan Seidle
https://github.com/sparkfun/Wimp_Weather_Station
This sketch prints the temperature, humidity, barrometric preassure, altitude,
soil moisture, and soil temperature to the Seril port. This sketch also
incorporates the Weather Meters avaialbe from SparkFun (SEN-08942), which allow
you to measure Wind Speed, Wind Direction, and Rainfall. Upload this sketch
after attaching a soil moisture and or soil temperature sensor and Wetaher
Meters to test your connections.
Hardware Connections:
This sketch was written specifically for the Photon Weather Shield,
which connects the HTU21D and MPL3115A2 to the I2C bus by default.
If you have an HTU21D and/or an MPL3115A2 breakout, use the following
hardware setup:
HTU21D ------------- Photon
(-) ------------------- GND
(+) ------------------- 3.3V (VCC)
CL ------------------- D1/SCL
DA ------------------- D0/SDA
MPL3115A2 ------------- Photon
GND ------------------- GND
VCC ------------------- 3.3V (VCC)
SCL ------------------ D1/SCL
SDA ------------------ D0/SDA
Soil Moisture Sensor ----- Photon
GND ------------------- GND
VCC ------------------- D5
SIG ------------------- A1
DS18B20 Temp Sensor ------ Photon
VCC (Red) ------------- 3.3V (VCC)
GND (Black) ----------- GND
SIG (White) ----------- D4
Development environment specifics:
IDE: Particle Dev
Hardware Platform: Particle Photon
Particle Core
This code is beerware; if you see me (or any other SparkFun
employee) at the local, and you've found our code helpful,
please buy us a round!
Distributed as-is; no warranty is given.
*******************************************************************************/
int RAIN = D2;
int WSPEED = D3;
int winddir = A0;
float currentTime = 0;
//Global Variables
//-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
long lastSecond; //The millis counter to see when a second rolls by
byte seconds; //When it hits 60, increase the current minute
byte minutes; //Keeps track of where we are in various arrays of data
//We need to keep track of the following variables:
//Wind speed/dir each update (no storage)
//Wind gust/dir over the day (no storage)
//Wind speed/dir, avg over 2 minutes (store 1 per second)
//Wind gust/dir over last 10 minutes (store 1 per minute)
//Rain over the past hour (store 1 per minute)
//Total rain over date (store one per day)
//These are all the weather values that wunderground expects:
float windspeedmph = 0; // [mph instantaneous wind speed]
long lastWindCheck = 0;
volatile float dailyrainin = 0; // [rain inches so far today in local time]
float humidity = 0;
float tempf = 0;
float pascals = 0;
float altf = 0;
float rainin = 0;
float windir = 0;
float humTempF = 0; //humidity sensor temp reading, fahrenheit
float humTempC = 0; //humidity sensor temp reading, celsius
float baroTempF = 0; //barometer sensor temp reading, fahrenheit
float baroTempC = 0; //barometer sensor temp reading, celsius
float dewptF = 0;
float dewptC = 0;
float inches = 0;
float tempC = 0;
int count = 0;
// volatiles are subject to modification by IRQs
volatile long lastWindIRQ = 0;
volatile byte windClicks = 0;
volatile unsigned long raintime, rainlast, raininterval, rain;
//Wunderground Vars
//char SERVER[] = "rtupdate.wunderground.com"; //Rapidfire update server - for multiple sends per minute
char SERVER [] = "weatherstation.wunderground.com"; //Standard server - for sends once per minute or less
char WEBPAGE [] = "GET /weatherstation/updateweatherstation.php?";
//Station Identification
char ID [] = "KNYESSEX3"; //Your station ID here
char PASSWORD [] = "xxREMOVEDxx"; //your Weather Underground password here
TCPClient client;
//Create Instance of HTU21D or SI7021 temp and humidity sensor and MPL3115A2 barrometric sensor
Weather sensor;
//Interrupt routines (these are called by the hardware interrupts, not by the main code)
//-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
void rainIRQ()
// Count rain gauge bucket tips as they occur
// Activated by the magnet and reed switch in the rain gauge, attached to input D2
{
raintime = millis(); // grab current time
raininterval = raintime - rainlast; // calculate interval between this and last event
if (raininterval > 10) // ignore switch-bounce glitches less than 10mS after initial edge
{
dailyrainin += 0.011; //Each dump is 0.011" of water
rainlast = raintime; // set up for next event
}
}
void wspeedIRQ()
// Activated by the magnet in the anemometer (2 ticks per rotation), attached to input D3
{
if (millis() - lastWindIRQ > 10) // Ignore switch-bounce glitches less than 10ms (142MPH max reading) after the reed switch closes
{
windClicks++; //There is 1.492MPH for each click per second.
}
}
//---------------------------------------------------------------
void setup()
{
pinMode(WSPEED, INPUT_PULLUP); // input from wind meters windspeed sensor
pinMode(RAIN, INPUT_PULLUP); // input from wind meters rain gauge sensor
Serial.begin(9600); // open serial over USB
// Make sure your Serial Terminal app is closed before powering your device
// Now open your Serial Terminal, and hit any key to continue!
//This line pauses the Serial port until a key is pressed
//Initialize the I2C sensors and ping them
sensor.begin();
/*You can only receive acurate barrometric readings or acurate altitiude
readings at a given time, not both at the same time. The following two lines
tell the sensor what mode to use. You could easily write a function that
takes a reading in one made and then switches to the other mode to grab that
reading, resulting in data that contains both acurate altitude and barrometric
readings. For this example, we will only be using the barometer mode. Be sure
to only uncomment one line at a time. */
sensor.setModeBarometer();//Set to Barometer Mode
//baro.setModeAltimeter();//Set to altimeter Mode
//These are additional MPL3115A2 functions the MUST be called for the sensor to work.
sensor.setOversampleRate(7); // Set Oversample rate
//Call with a rate from 0 to 7. See page 33 for table of ratios.
//Sets the over sample rate. Datasheet calls for 128 but you can set it
//from 1 to 128 samples. The higher the oversample rate the greater
//the time between data samples.
sensor.enableEventFlags(); //Necessary register calls to enble temp, baro ansd alt
seconds = 0;
lastSecond = millis();
// attach external interrupt pins to IRQ functions
attachInterrupt(RAIN, rainIRQ, FALLING);
attachInterrupt(WSPEED, wspeedIRQ, FALLING);
// turn on interrupts
interrupts();
}
//---------------------------------------------------------------
void loop()
{
//Get readings from all sensors
getWeather();
//Rather than use a delay, keeping track of a counter allows the photon to
sendToWU();
//reset daily rain counter @ 12:00 am ET,,,,based on utc time zone
currentTime = Time.now();
if ((Time.hour(currentTime) == 4) && (Time.minute(currentTime) == 0) && (Time.second(currentTime) == 0)){
dailyrainin = 0;
}
}
//---------------------------------------------------------------
void printInfo()
{
Serial.print(" Wind_Speed:");
Serial.print(windspeedmph, 1);
Serial.print("mph, ");
Serial.print("Rain:");
Serial.print(rainin, 2);
Serial.print("in., ");
Serial.print("Temp:");
Serial.print(tempf);
Serial.print("F, ");
Serial.print("Humidity:");
Serial.print(humidity);
Serial.print("%, ");
// Serial.print("Baro_Temp:");
// Serial.print(baroTemp);
//Serial.print("F, ");
Serial.print("Pressure:");
Serial.print(pascals/100);
Serial.print("hPa, ");
//The MPL3115A2 outputs the pressure in Pascals. However, most weather stations
//report pressure in hectopascals or millibars. Divide by 100 to get a reading
//more closely resembling what online weather reports may say in hPa or mb.
//Another common unit for pressure is Inches of Mercury (in.Hg). To convert
//from mb to in.Hg, use the following formula. P(inHg) = 0.0295300 * P(mb)
//More info on conversion can be found here:
//www.srh.noaa.gov/images/epz/wxcalc/pressureConversion.pdf
//If in altitude mode, print with these lines
//Serial.print("Altitude:");
//Serial.print(altf);
//Serial.println("ft.");
}
//---------------------------------------------------------------
//---------------------------------------------------------------
float get_wind_direction()
{
unsigned int adc;
adc = winddir; // get the current reading from the sensor
// The following table is ADC readings for the wind direction sensor output, sorted from low to high.
// Each threshold is the midpoint between adjacent headings. The output is degrees for that ADC reading.
// Note that these are not in compass degree order! See Weather Meters datasheet for more information.
//Wind Vains may vary in the values they return. To get exact wind direction,
//it is recomended that you AnalogRead the Wind Vain to make sure the values
//your wind vain output fall within the values listed below.
if(adc > 2270 && adc < 2290) return (4);//North
if(adc > 3220 && adc < 3299) return (1);//NE
if(adc > 3890 && adc < 3999) return (2);//East
if(adc > 3780 && adc < 3850) return (3);//SE
if(adc > 3570 && adc < 3650) return (0);//South
if(adc > 2790 && adc < 2850) return (5);//SW
if(adc > 1580 && adc < 1610) return (6);//West
if(adc > 1930 && adc < 1950) return (7);//NW
return (-1); // error, disconnected?
}
//---------------------------------------------------------------
//Returns the instataneous wind speed
float get_wind_speed()
{
float deltaTime = millis() - lastWindCheck; //750ms
deltaTime /= 1000.0; //Covert to seconds
float windSpeed = (float)windClicks / deltaTime; //3 / 0.750s = 4
windClicks = 0; //Reset and start watching for new wind
lastWindCheck = millis();
windSpeed *= 1.492; //4 * 1.492 = 5.968MPH
/* Serial.println();
Serial.print("Windspeed:");
Serial.println(windSpeed);*/
return(windSpeed);
}
//---------------------------------------------------------------
void getWeather()
{
// Measure Relative Humidity from the HTU21D or Si7021
humidity = sensor.getRH();
// Measure Temperature from the HTU21D or Si7021
humTempC = sensor.getTemp();
humTempF = (humTempC * 9)/5 + 32;
// Temperature is measured every time RH is requested.
// It is faster, therefore, to read it from previous RH
// measurement with getTemp() instead with readTemp()
//Measure the Barometer temperature in F from the MPL3115A2
baroTempC = sensor.readBaroTemp();
baroTempF = (baroTempC * 9)/5 + 32; //convert the temperature to F
//Measure Pressure from the MPL3115A2
pascals = sensor.readPressure();
inches = pascals * 0.0002953; // Calc for converting Pa to inHg (Wunderground expects inHg)
//Average the temperature reading from both sensors
tempC=((humTempC+baroTempC)/2);
tempf=((humTempF+baroTempF)/2);
//Calculate Dew Point
dewptC = dewPoint(tempC, humidity);
dewptF = (dewptC * 9.0)/ 5.0 + 32.0;
//If in altitude mode, you can get a reading in feet with this line:
//float altf = sensor.readAltitudeFt();
//Calc winddir
winddir = get_wind_direction();
//Calc windspeed
windspeedmph = get_wind_speed();
//Calc windgustmph
//Calc windgustdir
//Report the largest windgust today
//windgustmph = 0;
// windgustdir = 0;
}
// dewPoint function from NOAA
// reference (1) : http://wahiduddin.net/calc/density_algorithms.htm
// reference (2) : http://www.colorado.edu/geography/weather_station/Geog_site/about.htm
//---------------------------------------------------------------
double dewPoint(double celsius, double humidity)
{
// (1) Saturation Vapor Pressure = ESGG(T)
double RATIO = 373.15 / (273.15 + celsius);
double RHS = -7.90298 * (RATIO - 1);
RHS += 5.02808 * log10(RATIO);
RHS += -1.3816e-7 * (pow(10, (11.344 * (1 - 1/RATIO ))) - 1) ;
RHS += 8.1328e-3 * (pow(10, (-3.49149 * (RATIO - 1))) - 1) ;
RHS += log10(1013.246);
// factor -3 is to adjust units - Vapor Pressure SVP * humidity
double VP = pow(10, RHS - 3) * humidity;
// (2) DEWPOINT = F(Vapor Pressure)
double T = log(VP/0.61078); // temp var
return (241.88 * T) / (17.558 - T);
}
void sendToWU()
{
Serial.println("connecting...");
Spark.publish("Wunderground", "Upload");
if (client.connect(SERVER, 80)) {
Serial.println("Connected");
client.print(WEBPAGE);
client.print("ID=");
client.print(ID);
client.print("&PASSWORD=");
client.print(PASSWORD);
client.print("&dateutc=now"); //can use 'now' instead of time if sending in real time
client.print("&tempf=");
client.print(tempf);
client.print("&dewptf=");
client.print(dewptF);
client.print("&humidity=");
client.print(humidity);
client.print("&baromin=");
client.print(inches);
client.print("&winddir=");
client.print(winddir);
client.print("&windspeedmph=");
client.print(windspeedmph);
client.print("&rainin=");
client.print(rainin);
client.print("&dailyrainin=");
client.print(dailyrainin);
Spark.publish ("Online", "Yes");
client.print("&action=updateraw"); //Standard update rate - for sending once a minute or less
//client.print("&softwaretype=Particle-Photon&action=updateraw&realtime=1&rtfreq=5"); //Rapid Fire update rate - for sending multiple times per minute, specify frequency in seconds
client.println();
Serial.println("Upload complete");
delay(60000); //Without the delay it goes to sleep too fast and the send is unreliable
}else{
Serial.println(F("Connection failed"));
return;
}
}