Hi everyone,
I am very new to using Arduino and have managed (after some effort) to put together my first useable sketch for automating some LED lights for my bonsai.
I have am using a DHT 11 sensor for temp and humidity, TEMT light sensor and trying to log it all the data to an SD card and display on LCD.
I have managed to do pretty much all of this, however I can only log a single piece of information from the DHT sensor onto the SD card. I would like to log all of this information and the info from the TEMT Light sensor as well.
I have tried trying to create separate folders on the SD card for each piece of info, but that didn't work rather seemed to corrupt the SD card. What I want to do is have the info appear comma delimited so I can export to excel and get some graphs going.
Could anyone point me in the right direction? This is what i have so far - I am sure its hilariously inefficient and poorly written, but as I say this is probably my first real sketch that actually works.
Thanks to anyone who take the time to read and reply.
#include <SPI.h>
#include <SD.h>
#include "DHT.h"
#define DHTPIN 2 Pin 2
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);
int lightSensor = 0;
int lightValue = 0;
int LEDS= 3;
const int chipSelect = 10;
unsigned long second= 1000;
unsigned long minute= 60000;
unsigned long previousMillis=0;
the loop
void setup()
{
pinMode(10, OUTPUT);
pinMode (LEDS, OUTPUT);
Serial.begin(9600);
lcd.begin(16,2);
lcd.setCursor(0,0);
lcd.print("Hello, world!");
delay(1000);
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Initializing SD card...");
if (!SD.begin(chipSelect)) {
Serial.println("Card failed, or not present");
// don't do anything more:
return;
}
delay (1000);
lcd.clear();
lcd.setCursor(0,0); //Start at character 4 on line 0
lcd.print("Initializing SD card...");
SD.remove("datalog.txt");
delay (1000);
lcd.clear();
}
void loop()
{
// Following code initialise sensor and checks it it working
float h = dht.readHumidity(); // Read temperature as Celsius
float t = dht.readTemperature(); // Read temperature as Fahrenheit
float f = dht.readTemperature(true);
// Check if any reads failed and exit early (to try again).
if (isnan(h) || isnan(t) || isnan(f))
{
Serial.println("Failed to read from DHT sensor!");
return;
lcd.setCursor(0,0);
lcd.print("Failed to read from DHT sensor!");
}
//The print on LCD code
lcd.setCursor(0,0);
lcd.print("H");
lcd.setCursor(2,0);
lcd.print(h);
lcd.setCursor(7,0);
lcd.print("%");
lcd.setCursor(0,1);
lcd.print("T");
lcd.setCursor(2,1);
lcd.print(t); // prints temperature in Celcius
lcd.setCursor(7,1);
lcd.print("c");
lcd.setCursor(9,1);
lcd.print(f); // prints temperature in Faherenheit
lcd.setCursor(14,1);
lcd.print("f");
// Following code create minute delay between reading light sensor and recording data
lightValue = analogRead(lightSensor);
unsigned long currentMillis = millis();
if ((unsigned long)(currentMillis - previousMillis) >= 60000)
{
lcd.setCursor(9,0);
lcd.print("L ");
lcd.setCursor(11,0);
lcd.print(lightValue);
File dataFile = SD.open("datalog.txt", FILE_WRITE); // HERE I NEED TO WRITE ALL THE DATA RECEIVED FROM THE SENSORS I CAN ONLY WRITE TEMP at the moment 't'
if (dataFile) {
dataFile.println(t);
dataFile.close();
}
// if the file isn't open, pop up an error:
else {
lcd.setCursor(11,0);
lcd.print("FILE ERROR");
}
previousMillis = currentMillis;
if (lightValue >= 20)
{digitalWrite (LEDS,HIGH);}
else
{digitalWrite (LEDS,LOW);}
}
}