/* Banganga-Bit v1.0
Based on a basic BMP085 barometer script which triggers a piezo buzzer
when its about to rain and reads the water level in a tank using an ultrasonic
rangefinder which maps to a series of LEDs
*/
#include “Barometer.h”
#include

//Barometer definitions
float temperature;
float pressure;
float atm;
float altitude;
Barometer myBarometer;
int pinSpeaker = 3; //Set up a speaker on a PWM pin (digital 9, 10, or 11)
const float p0 = 101325; // Pressure at sea level (Pa)
// Add these to the top of your program
const float currentAltitude = 1580.08; // current altitude in METERS
const float ePressure = p0 * pow((1-altitude/44330), 5.255); // expected pressure (in Pa) at altitude
float weatherDiff;

//Ultrasonic Definitions
//Digital pin 7 for reading in the pulse width from the MaxSonar device.
//This variable is a constant because the pin will not change throughout execution of this code.
const int pwPin = 7;
//variables needed to store values
long pulse, inches, cm;

void setup(){
pinMode(pinSpeaker, OUTPUT);
Serial.begin(9600);
myBarometer.init();
for (int i=8; i<14; i++){ pinMode(i, OUTPUT); //sets the led pins 8 to 13 to output }} void loop() { //Barometer loop temperature = myBarometer.bmp085GetTemperature(myBarometer.bmp085ReadUT()); //Get the temperature, bmp085ReadUT MUST be called first pressure = myBarometer.bmp085GetPressure(myBarometer.bmp085ReadUP());//Get the temperature altitude = myBarometer.calcAltitude(pressure); //Uncompensated caculation - in Meters atm = pressure / 101325; Serial.print("Temperature: "); Serial.print(temperature, 2); //display 2 decimal places Serial.println("deg C"); Serial.print("Pressure: "); Serial.print(pressure, 0); //whole number only. Serial.println(" Pa"); Serial.print("Ralated Atmosphere: "); Serial.println(atm, 4); //display 4 decimal places Serial.print("Altitude: "); Serial.print(altitude, 2); //display 2 decimal places Serial.println(" m"); // Add this into loop(), after you've calculated the pressure weatherDiff = pressure - ePressure; if(weatherDiff > 250){
Serial.println(“Sunny!”);
}
else if ((weatherDiff <= 250) || (weatherDiff >= -250)){
Serial.println(“Partly Cloudy”);
}
else if (weatherDiff > -250){
playTone(300, 160);
delay(150);
Serial.println(“Rain :-(“);
}

Serial.println();

//Ensure to turn off ALL LEDs before continuing
for (int i=8; i<14; i++){ digitalWrite(i, LOW); } pinMode(pwPin, INPUT); //Used to read in the pulse that is being sent by the MaxSonar device. //Pulse Width representation with a scale factor of 147 uS per Inch. pulse = pulseIn(pwPin, HIGH); //147uS per inch inches = pulse/147; //change inches to centimetres cm = inches * 2.54; Serial.print(inches); Serial.print("in, "); Serial.print(cm); Serial.print("cm"); Serial.println(); /* Read the ultrasonic Level Adjust the value 12 to 27.5 to span 8 to 13 */ int tanklevel = map(cm, 12, 27.5, 8, 13); // Make sure the value does not go beyond 4 or 13 int LEDnum = constrain(tanklevel, 8, 13); /*Call the blink function: this will turn the LED on for 10 milliseconds, and keep it off for only 1 millisecond. You can change the blink rate by changing these values, however, I want a quick response time when the flex sensor bends, hence the small values. LEDnum determines which LED gets turned on.*/ blink(LEDnum, 10,1); delay(1000); //wait a second and get values again. } // duration in mSecs, frequency in hertz void playTone(long duration, int freq) { duration *= 1000; int period = (1.0 / freq) * 1000000; long elapsed_time = 0; while (elapsed_time < duration) { digitalWrite(pinSpeaker,HIGH); delayMicroseconds(period / 2); digitalWrite(pinSpeaker, LOW); delayMicroseconds(period / 2); elapsed_time += (period); } } // The blink function - used to turn the LEDs on and off void blink(int LEDPin, int onTime, int offTime){ // Turn the LED on digitalWrite(LEDPin, HIGH); // Delay so that you can see the LED go On. delay(100); // Turn the LED Off digitalWrite(LEDPin, LOW); // Increase this Delay if you want to see an actual blinking effect. delay(0); }