Hello everyone,
I'm trying to read and log data from a linear displacement and DHT11 sensor on an LCD and SD Card while using a button to start/stop the reading and loadig.
Here is the code i'm using :
#include <ezButton.h>
#include <RTClib.h>
#include <DHT.h>
#include <DHT_U.h>
#include <Adafruit_ADS1X15.h>
#include <LiquidCrystal_I2C.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#define DHTPIN 3 // Digital pin connected to the DHT sensor dht DHT11; //Sensor object named as DHT
#define DHTTYPE DHT11 // DHT 11
#define LOOP_STATE_STOPPED 0
#define LOOP_STATE_STARTED 1
ezButton button(2); // create ezButton object that attach to pin 2;
DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);
Adafruit_ADS1115 ads;
RTC_DS1307 RTC;
char daysoftheweek [7][12] = {"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};
int loopState = LOOP_STATE_STOPPED; //button state
int samplingfreq; //sampling frequency [milliseconds]
int sensorValue = 0; //for the raw data
float distance = 0; //for the calibrated distance
float h; // Humidity
float t;// Temperature as Celsius (the default)
const char* filename = "Displacements.txt";
File dataFile;
DateTime now;
// the setup routine runs once when you press reset:
void setup() {
// initialize serial communication at 115200 bits per second:
Serial.begin(115200);
// some info to know what is on the Arduino
Serial.println("KTR-100mm Displacement sensor, DHT11, LCD, Buttons.");
Serial.print("\n"); //linebreak
Serial.println("--------------------------------------------------");
//-----------------Taking care of LCD-------------------
//NOTE: if you cannot see the text on the LCD, try to change the potmeter on the back of it.
//Sometimes you just have wrong contrast settings and nothing shows up on the screen because of it.
lcd.begin(16,2); // initialize the lcd
lcd.backlight(); //initialize backlight
//------------------------------------------------------
lcd.clear(); //clear the LCD
lcd.setCursor(0, 0); //Defining positon to write from first row,first column .
lcd.print("KTR-100mm"); //some message
lcd.setCursor(0, 1); //Cursor is moved to the 2nd line of the LCD
lcd.print("Reading displ."); //You can write 16 Characters per line .
delay(3000); //wait 3 sec
// seting pinMode for pin 10 (SD Chipselect)
pinMode(10, OUTPUT);
//----Set default------
dht.begin();
// Check if any reads failed and exit early (to try again).
if (isnan(h) || isnan(t) ) {
Serial.println(F("Failed to read from DHT sensor!"));
lcd.clear(); //clear the LCD
lcd.setCursor(0, 0); //Defining positon to write from first row,first column .
lcd.print("DHT failed"); //some message
// don't do anything more:
return;}
RTC.begin();
//check or the Real Time Clock is on
if (! RTC.isrunning()) {
Serial.println("RTC is NOT running!");
// following line sets the RTC to the date & time this sketch was compiled
// uncomment it & upload to set the time, date and start run the RTC!
RTC.adjust(DateTime(__DATE__, __TIME__));
}
// see if the card is present and can be initialized:
if (!SD.begin(10)) {
Serial.println("Error : Push the reset button");
lcd.clear(); //clear the LCD
lcd.setCursor(0, 0); //Defining positon to write from first row,first column .
lcd.print("SD Card failed"); //some message
for (;;);
}
//----------------Initializing SD Card---------------------
// open the file. note that only one file can be open at a time,
// so you have to close this one before opening another.
//write down the date (year / month / day)
//prints only the start, so if the logger runs for sevenal days you only findt the start back at the begin.
now = RTC.now();
dataFile = SD.open(filename, FILE_WRITE);
dataFile.print("Start logging on: ");
dataFile.print(now.year(),DEC);
dataFile.print('/');
dataFile.print(now.month(),DEC);
dataFile.print('/');
dataFile.print(now.day(),DEC);
dataFile.println(" ");
dataFile.println("mm");
dataFile.println(",");
dataFile.println("Celsius");
dataFile.println(",");
dataFile.println("%");
dataFile.println(",");
dataFile.println("Time");
dataFile.close();
button.setDebounceTime(50); // set debounce time to 50 milliseconds
}
// the loop routine runs over and over again forever:
void loop() {
button.loop(); // MUST call the loop() function first
if (button.isPressed()) {
if (loopState == LOOP_STATE_STOPPED)
loopState = LOOP_STATE_STARTED;
else // if(loopState == LOOP_STATE_STARTED)
loopState = LOOP_STATE_STOPPED;
}
if (loopState == LOOP_STATE_STARTED) {
//read the time
now = RTC.now();
//--------------------------Reading data and sending to PC-----------------------------------------
// read the input on analog pin 0:
sensorValue = analogRead(A0);
// Convert the analog reading (which goes from 0 - 1023) to a distance (0 - 100 mm):
distance = sensorValue * (100.0 / 1023);
// Read Humidity
h = dht.readHumidity();
// Read temperature as Celsius (the default)
t = dht.readTemperature();
//---------------------------------Serial printout-------------------------------------------------
Serial.print("\n"); //linebreak
Serial.print("Displacement = "); //tab for separation
Serial.print(distance, 4); //calibrated data (displacement), 4 decimals
Serial.print(" mm");
Serial.print("\n"); //linebreak
Serial.print("Current humidity = ");
Serial.print(h);
Serial.print("% ");
Serial.print("\t"); //tab for separation
Serial.print("temperature = ");
Serial.print(t);
Serial.print("C ");
Serial.print("\n"); //linebreak
Serial.print("--------------------------------------------------------------------");
//-----------------------------------------LCD Printout------------------------------------------
lcd.clear(); //clear LCD
lcd.setCursor(0, 0); //Defining positon to write from first row,first column .
lcd.print(" ");
lcd.print(distance, 4); // calibrated data (displacement), 4 decimals
lcd.print(" mm");
lcd.setCursor(0, 1); //Defining positon to write from second row,first column .
lcd.print(t);
lcd.print(" C ");
lcd.print(h);
lcd.print(" %");
//-------------------------Writing on SD Card---------------------------------------------------
// open the file. note that only one file can be open at a time,
// so you have to close this one before opening another.
dataFile = SD.open(filename, FILE_WRITE);
// if the file is available, write to it:
// log the temperature and time.
if (dataFile.available()) {
dataFile.print(distance);
dataFile.print(",");
dataFile.print(t);
dataFile.print(",");
dataFile.print(h);
dataFile.print(",");
dataFile.print(now.hour(),DEC);
dataFile.print(":");
dataFile.print(now.minute(),DEC);
dataFile.print(":");
dataFile.println(now.second(),DEC);
dataFile.close();
// print to the serial port too:
Serial.print("\n"); //linebreak
Serial.println("data stored");
}
// if the file isn't open, pop up an error:
else {
Serial.print("\n"); //linebreak
Serial.println("error opening Displacements.txt");
}
delay(50);
}
}
everything works perfectly exept when it comes to writing data on the sd card i get this error due to not being able to open the file :
KTR-100mm Displacement sensor, DHT11, LCD, ButKTR-100mm Displacement sensor, DHT11, LCD, Buttons.
--------------------------------------------------
Displacement = 99.5112 mm
Current humidity = 71.00% temperature = 22.60C
--------------------------------------------------------------------
error opening Displacements.txt
My sd card is formated at FAT32 but i can't find the problem, tryed a lot for the last couple of days.
any help is apreciated.
