sensor_reader_328p.ino

/**************************************************************
 *
 * primabot Davis Sensor Reader
 * 
 * target prosesor: Atmega 328p
 * 
 * Widoyo
 * 20 Okt 2020
 * 
 **************************************************************/
#include <sensirion.h>

#define BUCKET_PIN  2
#define SOLAR_RAD_PIN A3
#define MEASURE_PERIODE 300
#define WIND_DIRECTION_PIN  A2
#define WIND_SPEED_PIN    3
#define BOUNCE_LIMIT 1000

sensirion sht(A4, A5);
volatile byte tick = 0;  // Tipping Bucket TICK
volatile int windrot = 0; // tick putaran wind speed
int wind_speed = 0;

void setup() {
  Serial.begin(9600);
  // put your setup code here, to run once:
  attachInterrupt(digitalPinToInterrupt(BUCKET_PIN), ticking, CHANGE);
  attachInterrupt(digitalPinToInterrupt(WIND_SPEED_PIN), wind_rot, FALLING);

}

String line = "";

void loop() {
  // put your main code here, to run repeatedly:
  static bool request = false;
  while (Serial.available()) {
    char c = Serial.read();
    Serial.print(c);
    if (c == 10) {
      Serial.print("line");
      if (line == ":#") request = true;
      line = "";
    } else {
      line += c;
    }
    Serial.print(line);
  }

  if (request){
    Serial.print(F("SHT Status: "));
    Serial.println(sht.readStatus());
    String data = "tick="+tick;
    data += ";temp=";
    data += readTemp();
    data += ";humi=";
    data += readHumi();
    data += ";wind_speed=";
    data += readWindSpeed();
    data += ";wind_dir=";
    data += readWindDirection(readWindVane());
    data += ";solar_rad=";
    data += readSunRadiation();
    request = false;
    Serial.println(data.c_str());
    Serial.println("Requested.");
    tick = 0;
    windrot = 0;
  }
}

void ticking() {
  static unsigned long last_millis = 0;
  unsigned long m = millis();
  if (m - last_millis < BOUNCE_LIMIT) {
    // terjadi bounce
  } else {
    if (digitalRead(BUCKET_PIN) == LOW) {
      tick++;
    }
  }
  last_millis = millis();
}

void wind_rot() {
  // ISR wind rotation  
  static unsigned long last_millis = 0;
  unsigned long m = millis();
  if (millis() - last_millis > 15) {
    windrot++;
    last_millis = m;    
  }
}

int readSunRadiation() {
  int rad = analogRead(SOLAR_RAD_PIN);
  int solar_rad = (int)(rad * 1000 / 1.67);
  return rad; // mW/M2
}

int readWindSpeed() {
  float t = 2.25 / MEASURE_PERIODE;
  int ws = (int)(windrot * t);
  
  return windrot;
}

int readWindVane() {
  int vane_value = analogRead(WIND_DIRECTION_PIN);
  int dir_degree = map(vane_value, 0, 4095, 0, 360);
  
  return vane_value;
}

// Converts compass direction to heading
String readWindDirection(int direction) {
  //
  String dir;
  if(direction < 22)
    dir = "U";
  else if (direction < 67)
    dir = "TL";
  else if (direction < 112)
    dir = "T";
  else if (direction < 157)
    dir = "Te";
  else if (direction < 212)
    dir = "S";
  else if (direction < 247)
    dir = "BD";
  else if (direction < 292)
    dir = "B";
  else if (direction < 337)
    dir = "BL";
  else
    dir = "U";
  return dir;
} 


float readTemp() {
  return sht.readTemperatureC();
}

float readHumi() {
  return sht.readHumidity();
}