fody weather station, wind sensor

flopp

It was a HT-01D sensor for measuring temp/hum. It is I2C and address is 0x28.
I found code for HYT 221 that worked fine.
https://github.com/stylesuxx/Arduino-HYT-221-I2C

gohan

I was looking at another product but your seems more easily hackable :)

dbemowsk

For anyone interested, I am in the process of designing a fully 3D printable weather station. The plan for the 3D printable parts will be:

rain gauge
combined wind speed and wind direction sensors
radiation shield that will house sensors for temp, humidity, barometric pressure and possibly a lux sensor.
central brain box for holding the MySensors electronics to control everything.

I am just finishing the wind speed and direction sensor parts today. I will post pics later. I have a post in this category for the rain gauge that will be part of the station. I am designing all the parts myself. I still need to figure out a few more parts plus the MySensors electronics and code. I'll post everything as I get the different parts done.

flopp

This post is deleted!

gohan

@flopp are you still using old library version? Are you going to make it a battery powered node or else? I noticed you didn't use any sleep in the code

flopp

@gohan said in fody weather station, wind sensor:

@flopp are you still using old library version?

Yes, this is for 1.5

Are you going to make it a battery powered node or else?I noticed you didn't use any sleep in the code

This is powered from a PC, not battery. I want data very often that's why it is not battery powered. I can also change the code if something is wrong.

flopp

This post is deleted!

sundberg84

@flopp - any more images? :)

flopp

@sundberg84
Can upload some later today.
I found that I have some problem with the NRf, so I need to open it up.
Will upload new code later today, as well.

flopp

This post is deleted!

flopp

some pictures

flopp

I am using this water proof connector for USB connection.
https://www.aliexpress.com/item/Free-Shipping-3-Sets-All-New-4-Pin-Waterproof-Electrical-Wire-Connector-Plug-HID-Male-female/32264045957.html

in sweden you can buy it at Biltema

flopp

I have not verify all the code yet.
Wind direction is correct.
Temp is little bit higher then another temp that I have on shadow so maybe the radiation shield is not working 100%
Hum: my other sensor that I have outdoor broke a few weeks ago, so nothing to compare with
Wind Speed: I want to verify with an RPM tool. I get some extra indication from reeed switch.
Every second indication is below 1000 micros which is 1 millisecond, which is 1000m/s
Rain: lucky or unlucky I have not had any rain when the mast was up and running

gohan

Maybe you need a better heat shield, did you try some aluminum foil?

flopp

@gohan said in fody weather station, wind sensor:

Maybe you need a better heat shield, did you try some aluminum foil?

Good idea :)
Should I have the foil inside the shield or outside?
Any pics if you done it yourself?
I think I need some air through the shield so it can cool down.

gohan

I haven't done anything yet, I'm just trying to apply some cheap physics 😀
I'd start from the outside and see what happens

flopp

@gohan
Ok, thanks.

I will try it tomorrow

flopp

New code again :frowning:
Wind speed: it compare between two interrupts if it is too quick, if more than 100000 micros it will not use it

#include <SPI.h>
#include <MySensor.h>  
#include <Wire.h>

#define WIND_CHILD 0
#define TEMP_CHILD 1
#define HUM_CHILD 2
#define RAIN_CHILD 3

MySensor gw;

MyMessage WSMsg(WIND_CHILD, V_WIND);
MyMessage WGMsg(WIND_CHILD, V_GUST);
MyMessage WDMsg(WIND_CHILD, V_DIRECTION);
MyMessage TempMsg(TEMP_CHILD, V_TEMP);
MyMessage HumMsg(HUM_CHILD, V_HUM);
MyMessage RainMsg(RAIN_CHILD, V_RAIN);
MyMessage RainCounterMsg(RAIN_CHILD,V_VAR1);

//Wind Speed
volatile unsigned long lastPulse = 0;
volatile unsigned long intervalSum;
unsigned long lastInterval = 0;
unsigned long looptime;
float WS = 0;
float WG = 0;
int WScount = 0;

//Wind Direction
int WDarray[8] = {0,45,90,135,180,225,270,315};
int WD;

//Rain
volatile float hwRainVolume = 0;   // Current rainvolume calculated in hardware.
float bucketSize = 0.4;   // mm per tip
boolean pcReceived = false; 
volatile unsigned long lastSend = 0;

// Temperature/Humidity
double hum = 0;
double temp = 0;

void setup() {
  
  Wire.begin();   //start i2c
  
  gw.begin(incomingMessage, AUTO, false);

  // Send the sketch version information to the gateway and Controller
  gw.sendSketchInfo("WeatherMast", "170427");

  gw.present(WIND_CHILD, S_WIND);
  gw.present(TEMP_CHILD, S_TEMP);
  gw.present(HUM_CHILD, S_HUM);
  gw.present(RAIN_CHILD, S_RAIN);

  gw.request(RAIN_CHILD, V_VAR1);
  gw.wait(5000);
  //pin 2 is rain, pin 3 is wind speed
  //pin 4-8, 14-16 is wind direction
  //configure pin 2-8 as an input and enable the internal pull-up resistor
  for (int i=2 ; i < 9 ; i++) {
    pinMode(i, INPUT_PULLUP);
  }
  //configure pin 14-16(A0-A2) as an input and enable the internal pull-up resistor
  for (int i=14 ; i < 17 ; i++) {
    pinMode(i, INPUT_PULLUP);
  }
  attachInterrupt(0, Rain, FALLING);    //rain
  attachInterrupt(1, WindSpeed, FALLING);   //wind speed
}

void loop()
{
  gw.wait(60000);
  detachInterrupt(1);
  looptime = micros();
  readTempHum();    //read temperature and humidity
  readWindDirection();    //read wind direction
  resend((WSMsg.set(WS, 1)),3);
  WS = 0;  //reset wind speed, useful if there is no wind otherwise old value will be sent to Controller
  resend((WGMsg.set(WG, 1)),3);
  WG = 0;   //reset gust
  resend((WDMsg.set(WD, 1)),3);
  resend((RainMsg.set((float)hwRainVolume,2)),3);
  resend((TempMsg.set(temp, 1)),3);
  resend((HumMsg.set(hum, 1)),3);
  lastPulse += micros() - looptime;
  attachInterrupt(1, WindSpeed, FALLING);   //wind speed
}

void readWindDirection()
{
  //check in what direction the wind is. First sensor that have light will be the direction
  int i = 4;
  for (i; i < 9 ; i++){
    if (!digitalRead(i)){
      WD = WDarray[i-4];
      return;
    }
  }
  i = 14;
  for (i; i < 17 ; i++){
    if (!digitalRead(i)){
      WD = WDarray[i-9];
      return;
    }
  }
}

void Rain()
{ 
  unsigned long currentTime = millis();
  if (!pcReceived) {      
    gw.request(RAIN_CHILD, V_VAR1);
    Serial.println("Request rainCount");
    gw.process();
    return;
  }
  if (currentTime - lastSend > 5000) {      
  hwRainVolume = hwRainVolume + bucketSize;
  resend((RainCounterMsg.set(hwRainVolume,2)),3);
  resend((RainMsg.set((float)hwRainVolume,2)),3);
  lastSend=currentTime;
  }
}

void WindSpeed()
{
  detachInterrupt(1);
  volatile unsigned long newPulse = micros();  
  unsigned long interval = newPulse-lastPulse;
  if (interval<16000L) { // Sometimes we get wrong interrupt. 16000L = ~30 m/s
    attachInterrupt(1, WindSpeed, FALLING);
    lastPulse = newPulse;
    return;
  }
  long a = interval-lastInterval;
  a = abs(a);
  lastInterval = interval;
  if (a > 100000) {  
    lastPulse = newPulse;
    attachInterrupt(1, WindSpeed, FALLING);
    return;
  }
  else {
    lastPulse = newPulse;
    WS = (0.4775/(interval/1000000.0));   
    if (WS > WG) {
      WG = WS;
    }
  }
  attachInterrupt(1, WindSpeed, FALLING);
}

void readTempHum()
{
  Wire.beginTransmission(0x28);   // Begin transmission with given device on I2C bus
  Wire.requestFrom(0x28, 4);      // Request 4 bytes 
  if(Wire.available() == 4) {                   
    int b1 = Wire.read();
    int b2 = Wire.read();
    int b3 = Wire.read();
    int b4 = Wire.read();
    
    Wire.endTransmission();           // End transmission and release I2C bus
    
    // combine humidity bytes and calculate humidity
    int rawHumidity = b1 << 8 | b2;
    // compound bitwise to get 14 bit measurement first two bits
    // are status/stall bit (see intro text)
    rawHumidity =  (rawHumidity &= 0x3FFF);
    hum = 100.0 / pow(2,14) * rawHumidity;
    
    // combine temperature bytes and calculate temperature
    b4 = (b4 >> 2); // Mask away 2 least significant bits see HYT 221 doc
    int rawTemperature = b3 << 6 | b4;
    temp = 165.0 / pow(2,14) * rawTemperature - 40;
   }
}

void incomingMessage(const MyMessage &message)
{
  if (message.type==V_VAR1) {
    hwRainVolume = message.getFloat();
    pcReceived = true;
    Serial.print("Received last pulse count from gw: ");
    Serial.println(hwRainVolume,2);   
  }
}

void resend(MyMessage &msg, int repeats)
{
  int repeat = 1;
  int repeatdelay = 0;
  boolean sendOK = false;

  while ((sendOK == false) and (repeat < repeats)) {
    if (gw.send(msg)) {
      sendOK = true;
    }
    else {
      sendOK = false;
      Serial.print("Error ");
      Serial.println(repeat);
      repeatdelay += 500;
    }
    repeat++; delay(repeatdelay);
  }
}

EDIT: added

WS = 0;

in loop

gohan

So, how is the hacking going? :)

flopp

@gohan
Thanks for asking :)
It is working good, but I don't trust the wind speed. I have lots of "ghost" indications from the reed
switch, I tried to remove it with code in two different ways but anyway I get some high values. I will order a wind speed meter and check against that one. I also record a slow-mo video when it spins in front of a fan(2.5m/s) and it is correct but it is difficult to test it with 10 m/s,

If anyone are inreseted what's inside the receiver that was included from Fody. It look like this

fody weather station, wind sensor

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