Hello, I found a great SD weather logger project that I'm almost ready to carry out once I get the rest of my sensors soon hopefully. The problem is with a pressure sensor I bought. I thought it would be backwards compatible with the BMP180, but it is not. I found a library that does support this sensor, but haven't been able to figure out how to replace the pressure readings into the project I would like to do. Basically, I want to get just the pressure reading from the BMP280 and let the project code to the work to calculate proper sea level pressure, pretty much just like the current code would do, except with a BMP180. Any help would be greatly appreciated. Here is the YouTube link to the project I'm working on, which has all the links needed to carry out this project:
Here is the BMP280 library link: GitHub - mahfuz195/BMP280-arduino-library: This BMP280 sensor library uses I2C communication with Arduino/ESP8266 and read the Temperature( degC) , Pressure (mBar) and Altitude (m).
Here is the code from that YouTube project that I want to change to accommodate the BMP280:
#include <LowPower.h>
#include <BH1750.h>
#include <SFE_BMP180.h>
#include <DHT.h>
#include <Wire.h>
#include "Sodaq_DS3231.h"
#include <SD.h>
#include <SPI.h>
#define DHTPIN 2
#define DHTTYPE DHT22 // DHT 22 (AM2302)
#define ALTITUDE 216.0 // Altitude in Sparta, Greece
char TEMPERATURE = 'C' ; //Change it to F to log degrees Fahrenheit
int INTERVAL = 1; //interval of measurements in minutes
DateTime dt(2015, 12, 14, 9, 28, 40, 1); //Date and time
int CS_PIN = 10;
int ledPin = 7;
int POWERPIN = 3;
File file;
DHT dht(DHTPIN,DHTTYPE);
SFE_BMP180 pressureSensor;
BH1750 lightMeter;
int id = 0;
void setup ()
{
pinMode(POWERPIN, OUTPUT);
digitalWrite(POWERPIN,HIGH);
pinMode(ledPin, OUTPUT);
initializeSD();
//rtc.setDateTime(dt); //Adjust date-time as defined 'dt' above
}
void loop ()
{
String temperature;
String humidity;
String light;
String pressure;
String entryId;
String dateEntry;
id++;
digitalWrite(POWERPIN,HIGH);
digitalWrite(ledPin,HIGH);
delay(2000);
initSensors();
delay(10000);
entryId = String(id);
humidity = String(dht.readHumidity());
if(TEMPERATURE =='F')
{
temperature = String(dht.readTemperature(true));
}else
{
temperature = String(dht.readTemperature());
}
pressure = readPressure();
light = readLight();
dateEntry = DateLogEntry();
String entry = entryId+","+dateEntry+","+temperature+","+humidity+","+pressure+","+light;
writeEntryToFile(entry);
delay(2000);
sleepForMinutes(INTERVAL);
}
void initSensors()
{
Wire.begin();
rtc.begin();
dht.begin();
pressureSensor.begin();
lightMeter.begin();
}
void sleepForMinutes(int interval)
{
int i=0;
int seconds = interval*60;
int iterations = seconds/8;
for (byte i = 0; i <= A5; i++)
{
pinMode (i, OUTPUT); // changed as per below
digitalWrite (i, LOW); // ditto
}
digitalWrite(POWERPIN,LOW);
for(i=0;i<iterations;i++)
{
LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF);
}
}
float readPressureFromSensor()
{
char status;
double T,P,p0,a;
status = pressureSensor.startTemperature();
if (status != 0)
{
delay(status);
status = pressureSensor.getTemperature(T);
if (status != 0)
{
status = pressureSensor.startPressure(3);
if (status != 0)
{
delay(status);
status = pressureSensor.getPressure(P,T);
if (status != 0)
{
p0 = pressureSensor.sealevel(P,ALTITUDE);
return p0;
}
}
}
}
}
String DateLogEntry()
{
String dateEntry;
String year;
String month;
String day;
String hour;
String minute;
DateTime now = rtc.now();
year = String(now.year());
month = String(now.month());
day = String(now.date());
if(now.hour()<10)
{
hour = "0"+String(now.hour());
}else
{
hour = String(now.hour());
}
if(now.minute()<10)
{
minute = "0"+String(now.minute());
}else
{
minute = String(now.minute());
}
dateEntry = month+"/"+day+"/"+year+" "+hour+":"+minute;
return dateEntry;
}
String readLight()
{
uint16_t lux = lightMeter.readLightLevel();
return String(lux);
}
String readPressure()
{
String pressure;
pressure = String(readPressureFromSensor());
return pressure;
}
void initializeSD()
{
pinMode(10, OUTPUT); // change this to 53 on a mega // don't follow this!!
digitalWrite(10, HIGH); // Add this line
if (SD.begin(CS_PIN))
{
digitalWrite(ledPin,LOW);
} else
{
digitalWrite(ledPin,LOW);
delay(1000);
digitalWrite(ledPin,HIGH);
delay(1000);
digitalWrite(ledPin,LOW);
delay(1000);
digitalWrite(ledPin,HIGH);
return;
}
}
int openFileToWrite(char filename[])
{
file = SD.open(filename, FILE_WRITE);
if (file)
{
digitalWrite(ledPin,HIGH);
delay(200);
digitalWrite(ledPin,LOW);
delay(200);
digitalWrite(ledPin,HIGH);
delay(200);
digitalWrite(ledPin,LOW);
return 1;
} else
{
return 0;
}
}
int writeToFile(String text)
{
if (file)
{
file.println(text);
return 1;
} else
{
return 0;
}
}
void closeFile()
{
if (file)
{
file.close();
}
}
void writeEntryToFile(String entry)
{
openFileToWrite("log.txt");
writeToFile(entry);
closeFile();
}