ESP8266 Weather Station Timer Issue
Posted: Fri Mar 03, 2017 10:05 pmI some code that I am trying to used on an ESP8266 and I am having some issues with the interrupt timers and I don't know how to fix it. Below is the code that I am using to gather wind speed and direction. If someone would be kind enough to take a look and see what might the issue is that would be great.
Code: Select all
#include "TimerOne.h" // Timer Interrupt set to 2 second for read sensors
#include <math.h>
#define WindSensorPin (14) // The pin location of the anemometer sensor
// NOT Connected Yet #define WindVanePin (A4) // The pin the wind vane sensor is connected to
#define VaneOffset 0; // define the anemometer offset from magnetic north
int VaneValue; // raw analog value from wind vane
int Direction; // translated 0 - 360 direction
int CalDirection; // converted value with offset applied
int LastValue;
volatile bool IsSampleRequired; // this is set true every 2.5s. Get wind speed
volatile unsigned int TimerCount; // used to determine 2.5sec timer count
volatile unsigned long Rotations; // cup rotation counter used in interrupt routine
volatile unsigned long ContactBounceTime; // Timer to avoid contact bounce in interrupt routine
float WindSpeed; // speed miles per hour
void setup() {
LastValue = 0;
IsSampleRequired = false;
TimerCount = 0;
Rotations = 0; // Set Rotations to 0 ready for calculations
Serial.begin(9600);
pinMode(WindSensorPin, INPUT);
attachInterrupt(digitalPinToInterrupt(WindSensorPin), isr_rotation, FALLING);
Serial.println("Davis Anemometer Test");
Serial.println("Speed (MPH)\tKnots\tDirection\tStrength");
// Setup the timer intterupt
Timer1.initialize(500000);
Timer1.attachInterrupt(isr_timer);
}
void loop() {
getWindDirection();
// Only update the display if change greater than 5 degrees.
if(abs(CalDirection - LastValue) > 5)
{
LastValue = CalDirection;
}
if(IsSampleRequired)
{
// convert to mp/h using the formula V=P(2.25/T)
// V = P(2.25/2.5) = P * 0.9
WindSpeed = Rotations * 0.9;
Rotations = 0; // Reset count for next sample
IsSampleRequired = false;
Serial.print(WindSpeed); Serial.print("\t\t");
Serial.print(getKnots(WindSpeed)); Serial.print("\t");
Serial.print(CalDirection);
getHeading(CalDirection); Serial.print("\t\t");
getWindStrength(WindSpeed);
}
}
// isr routine fr timer interrupt
void isr_timer() {
TimerCount++;
if(TimerCount == 5)
{
IsSampleRequired = true;
TimerCount = 0;
}
}
// This is the function that the interrupt calls to increment the rotation count
void isr_rotation () {
if ((millis() - ContactBounceTime) > 15 ) { // debounce the switch contact.
Rotations++;
ContactBounceTime = millis();
}
}
// Convert MPH to Knots
float getKnots(float speed) {
return speed * 0.868976;
}
// Get Wind Direction
void getWindDirection() {
VaneValue = analogRead(WindVanePin);
Direction = map(VaneValue, 0, 1023, 0, 360);
CalDirection = Direction + VaneOffset;
if(CalDirection > 360)
CalDirection = CalDirection - 360;
if(CalDirection < 0)
CalDirection = CalDirection + 360;
}
// Converts compass direction to heading
void getHeading(int direction) {
if(direction < 22)
Serial.print(" N");
else if (direction < 67)
Serial.print(" NE");
else if (direction < 112)
Serial.print(" E");
else if (direction < 157)
Serial.print(" SE");
else if (direction < 212)
Serial.print(" S");
else if (direction < 247)
Serial.print(" SW");
else if (direction < 292)
Serial.print(" W");
else if (direction < 337)
Serial.print(" NW");
else
Serial.print(" N");
}
// converts wind speed to wind strength
void getWindStrength(float speed)
{
if(speed < 2)
Serial.println("Calm");
else if(speed >= 2 && speed < 4)
Serial.println("Light Air");
else if(speed >= 4 && speed < 8)
Serial.println("Light Breeze");
else if(speed >= 8 && speed < 13)
Serial.println("Gentle Breeze");
else if(speed >= 13 && speed < 18)
Serial.println("Moderate Breeze");
else if(speed >= 18 && speed < 25)
Serial.println("Fresh Breeze");
else if(speed >= 25 && speed < 31)
Serial.println("Strong Breeze");
else if(speed >= 31 && speed < 39)
Serial.println("Near Gale");
else
Serial.println("RUN");
}