Hi everyone,
Arduino drives me a bit crazy these days. I have built a thing which can measure temperature, humidity of air and of soil and air pressure. I added a I2C Display and it connects via wifi to my router to catch time via NTP. It works fine. I wanted to add a data logger function for my measurements to save them to a SD-card. The simple Arduino example sketch works fine to me. However my own sketch works too, but nothing was saved to my SD-card and it says: "error opening datalog.txt". So this means the "SD.open" function fails. But why?
#include <LiquidCrystal_I2C.h>
#include <SPI.h>
#include <SD.h>
#include <DHT.h>
#include <Wire.h>
//Pressure Sensor
#include <Adafruit_BMP085.h>
#include <WiFi101.h>
#include "arduino_secrets.h"
//modified library
#include <NTPClient.h>
#include <WiFiUdp.h>
#define DHTPIN 8
#define DHTTYPE DHT22
#define SHUMSENSOR A0
DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x3F, 20, 4);
Adafruit_BMP085 bmp;
WiFiClient Client;
const int chipSelect = 4;
int status = WL_IDLE_STATUS;
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP);
void setup() {
bmp.begin();
dht.begin();
Serial.begin(9600);
lcd.init();
lcd.backlight();
analogReadResolution(12);
while(status != WL_CONNECTED) {
Serial.print("Verbinde zu SSID: ");
Serial.println(ssid);
status = WiFi.begin(ssid, pass);
delay(10000);
}
Serial.println("Verbunden!");
timeClient.begin();
// Set offset time in seconds to adjust for your timezone, for example:
// GMT +1 = 3600
// GMT +8 = 28800
// GMT -1 = -3600
// GMT 0 = 0
timeClient.setTimeOffset(7200);
while (!Serial);
Serial.print("Initializing SD card...");
if (!SD.begin(chipSelect)) {
Serial.println("initialization failed. Things to check:");
Serial.println("1. is a card inserted?");
Serial.println("2. is your wiring correct?");
Serial.println("3. did you change the chipSelect pin to match your shield or module?");
Serial.println("Note: press reset or reopen this serial monitor after fixing your issue!");
while (true);
}
Serial.println("initialization done.");
}
void loop() {
delay(2000);
//functions for LCD
readTempHum();
readPress();
readSHum();
writeSD();
while(!timeClient.update()) {
timeClient.forceUpdate();
}
Serial.print(timeClient.getFormattedDate());
Serial.print(", ");
Serial.print(timeClient.getFormattedTime());
Serial.print(", ");
Serial.print(dht.readTemperature(), 1);
Serial.print(" °C, ");
Serial.print(dht.readHumidity(), 1);
Serial.print(" hPa, ");
Serial.println(analogRead(SHUMSENSOR));
}
void readTempHum() {
lcd.setCursor(0, 0);
lcd.print("Temperatur: ");
lcd.setCursor(0, 1);
lcd.print("Luftfeuchte: ");
lcd.setCursor(13, 0);
lcd.print(dht.readTemperature(), 1);
lcd.setCursor(18, 0);
lcd.write(0xDF);
lcd.print("C");
lcd.setCursor(13, 1);
lcd.print(dht.readHumidity(), 1);
lcd.setCursor(17, 1);
lcd.print("%");
}
void readPress() {
lcd.setCursor(0, 2);
lcd.print("Luftdruck: ");
lcd.setCursor(13, 2);
lcd.print(bmp.readPressure() / 100);
lcd.print(" hPa");
}
void readSHum() {
lcd.setCursor(0, 3);
lcd.print("Bodenfeuchte: ");
lcd.setCursor(14, 3);
int bodenFeuchte = analogRead(SHUMSENSOR);
lcd.print(bodenFeuchte);
}
void writeSD() {
File dataFile = SD.open("datalog.txt", FILE_WRITE);
// if the file is available, write to it:
if (dataFile) {
dataFile.print(timeClient.getFormattedDate());
dataFile.print(", ");
dataFile.print(timeClient.getFormattedTime());
dataFile.print(", ");
dataFile.print(dht.readTemperature(), 1);
dataFile.print(" °C, ");
dataFile.print(dht.readHumidity(), 1);
dataFile.print(" hPa, ");
dataFile.println(analogRead(SHUMSENSOR));
dataFile.close();
}
// if the file isn't open, pop up an error:
else {
Serial.println("error opening datalog.txt");
}
}
Here a nicer view: #include <LiquidCrystal_I2C.h>#include <SPI.h>#include <SD.h>#include <DHT - Pastebin.com
Please help me, I tried many things, but nothing worked. 