Code throwing errors after an IDE update

Question

I'm really new to coding for arduino. My current project is a monitor for my terrarium using an arduino UNO board, a DHT11 and a DS3231 RTC, displaying Temperature(from both DHT (in the terrarium) and the RTC (outside)) as well as time and humidity.

The code was functional, but recently the IDE said there were some updates (which I ran) and now it won't verify. All this code was basically obtained through examples for the hardware I'm using. Can someone please point me to what I need to correct?

The code as is ....

#include <DS3231.h>
#include <dht11.h>
#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
DS3231 rtc(SDA, SCL); 
dht11 DHT; //Note:DHT on behalf of the temperature and humidity sensor 
const int dht11_data = 6; 
int temp=0;
int hum=0;
#include "Wire.h"
#define DS3231_I2C_ADDRESS 0x68
 // Convert normal decimal numbers to binary coded decimal
byte decToBcd(byte val)
{
 return( (val/10*16) + (val%10) );
}
 // Convert binary coded decimal to normal decimal numbers
byte bcdToDec(byte val)
{
 return( (val/16*10) + (val%16) );
}
void setup()
{
 Wire.begin();
 // set the initial time here:
 // DS3231 seconds, minutes, hours, day, date, month, year
 // setDS3231time(30,42,21,4,26,11,14);
 rtc.begin(); //Initialize the rtc object
 lcd.begin(16,2); //Initialize LCD display
 lcd.print("Terrarium "); //Splash Screen text line 1
 lcd.setCursor(0,1); //Set Cursor Position for second line of Splash screen
 lcd.print("Monitor 1.3"); //Splash screen text line 2
 delay(3000); //Delay 3 seconds on Splash screen
 lcd.clear(); //Clear LCD
}
void setDS3231time(byte second, byte minute, byte hour, byte dayOfWeek, byte
dayOfMonth, byte month, byte year)
{
 // sets time and date data to DS3231
 Wire.beginTransmission(DS3231_I2C_ADDRESS);
 Wire.write(0); // set next input to start at the seconds register
 Wire.write(decToBcd(second)); // set seconds
 Wire.write(decToBcd(minute)); // set minutes
 Wire.write(decToBcd(hour)); // set hours
 Wire.write(decToBcd(dayOfWeek)); // set day of week (1=Sunday, 7=Saturday)
 Wire.write(decToBcd(dayOfMonth)); // set date (1 to 31)
 Wire.write(decToBcd(month)); // set month
 Wire.write(decToBcd(year)); // set year (0 to 99)
 Wire.endTransmission();
}
void readDS3231time(byte *second,byte *minute,byte *hour,byte *dayOfWeek,byte *dayOfMonth,byte *month,byte *year)
{
 Wire.beginTransmission(DS3231_I2C_ADDRESS);
 Wire.write(0); // set DS3231 register pointer to 00h
 Wire.endTransmission();
 Wire.requestFrom(DS3231_I2C_ADDRESS, 7);
 // request seven bytes of data from DS3231 starting from register 00h
 *second = bcdToDec(Wire.read() & 0x7f);
 *minute = bcdToDec(Wire.read());
 *hour = bcdToDec(Wire.read() & 0x3f);
 *dayOfWeek = bcdToDec(Wire.read());
 *dayOfMonth = bcdToDec(Wire.read());
 *month = bcdToDec(Wire.read());
 *year = bcdToDec(Wire.read());
}
void displayTime()
{
 DHT.read(dht11_data);
 temp=DHT.temperature;
 hum=DHT.humidity;
 lcd.clear(); //clear display
 lcd.print("rH="); //Display text rH= on LCD
 lcd.print(hum); //Display relative humidiy reading from DHT11
 lcd.print("%"); //Display Percent sign
 lcd.setCursor(9,0) ; //set cursor position
 lcd.print("Ti="); //display"Ti="
 lcd.print(temp); //Displays temperature reading from DHT11, designated is Internal Temperature
 lcd.write(0xDF); //Display custom characters '°'
 lcd.print("C"); //Display text "C" to designate Celsius units
 byte second, minute, hour, dayOfWeek, dayOfMonth, month, year;
 // retrieve data from DS3231
 readDS3231time(&second, &minute, &hour, &dayOfWeek, &dayOfMonth, &month, &year);
 // send it to the serial monitor
 lcd.setCursor(0,1);
 lcd.print(hour, DEC); //Displays hours value on LCD
 // convert the byte variable to a decimal number when displayed
 lcd.print(":"); //Displays ":" between hours and minutes
 if (minute<10)
 {
 lcd.print("0");
 }
 lcd.print(minute, DEC); //Displays Minutes value on the LCD
 lcd.setCursor(9,1);
 lcd.print ("Te:"); //Displays text "Te:" on LCD
 lcd.print(rtc.getTemp()); //Displays Temperature from DS3231 designated as "External Temperature"
}
void loop()
{
 displayTime(); // display the real-time clock data on the Serial Monitor,
 delay(1000); // every second
}

and the errors it is throwing are:

> > Arduino: 1.8.3 (Windows 10), Board: "Arduino/Genuino Uno"
> 
> Terrarium_Monitor_1.3:8: error: no matching function for call to
> 'DS3231::DS3231(const uint8_t&, const uint8_t&)'
> 
> DS3231 rtc(SDA, SCL); 
> 
> ^
> 
> F:\Arduino Kit Stuff\my
> sketches\Terrarium_Monitor_1.3\Terrarium_Monitor_1.3.ino:8:21: note:
> candidates are:
> 
> In file included from F:\Arduino Kit Stuff\my
> sketches\Terrarium_Monitor_1.3\Terrarium_Monitor_1.3.ino:1:0:
> 
> C:\Users\Ursinos\Documents\Arduino\libraries\DS3231/DS3231.h:64:3:
> note: DS3231::DS3231()
> 
> DS3231();
> 
> ^
> 
> C:\Users\Ursinos\Documents\Arduino\libraries\DS3231/DS3231.h:64:3:
> note: candidate expects 0 arguments, 2 provided
> 
> C:\Users\Ursinos\Documents\Arduino\libraries\DS3231/DS3231.h:60:7:
> note: constexpr DS3231::DS3231(const DS3231&)
> 
> class DS3231 {
> 
> ^
> 
> C:\Users\Ursinos\Documents\Arduino\libraries\DS3231/DS3231.h:60:7:
> note: candidate expects 1 argument, 2 provided
> 
> C:\Users\Ursinos\Documents\Arduino\libraries\DS3231/DS3231.h:60:7:
> note: constexpr DS3231::DS3231(DS3231&&)
> 
> C:\Users\Ursinos\Documents\Arduino\libraries\DS3231/DS3231.h:60:7:
> note: candidate expects 1 argument, 2 provided
> 
> F:\Arduino Kit Stuff\my
> sketches\Terrarium_Monitor_1.3\Terrarium_Monitor_1.3.ino: In function
> 'void setup()':
> 
> Terrarium_Monitor_1.3:34: error: 'class DS3231' has no member named
> 'begin'
> 
> rtc.begin(); //Initialize the rtc object
> 
> ^
> 
> F:\Arduino Kit Stuff\my
> sketches\Terrarium_Monitor_1.3\Terrarium_Monitor_1.3.ino: In function
> 'void displayTime()':
> 
> Terrarium_Monitor_1.3:112: error: 'class DS3231' has no member named
> 'getTemp'
> 
> lcd.print(rtc.getTemp()); //Displays Temperature from DS3231
> designated as "External Temperature"
> 
> ^
> 
> Multiple libraries were found for "LiquidCrystal.h" Used: E:\Program
> Files (x86)\Arduino\libraries\LiquidCrystal Not used:
> C:\Users\Ursinos\Documents\Arduino\libraries\arduino_136712 exit
> status 1 no matching function for call to 'DS3231::DS3231(const
> uint8_t&, const uint8_t&)'
> 
> This report would have more information with "Show verbose output
> during compilation" option enabled in File -> Preferences.

As I said, I was working when I uploaded it to my arduino on last changes a week ago (and it's still running on the board right now), but after doing the updates to the libraries and whatnot, it's now throwing all these errors. I know the code isn't very elegant, I'm still learning. Please help

edit: After altering the line as advised in the answers, I now get the following errors.

Arduino: 1.8.3 (Windows 10), Board: "Arduino/Genuino Uno"
F:\Arduino Kit Stuff\my sketches\Terrarium_Monitor_1.3 \Terrarium_Monitor_1.3.ino: In function 'void setup()':
Terrarium_Monitor_1.3:34: error: 'class DS3231' has no member named 'begin'
 rtc.begin(); //Initialize the rtc object
 ^
F:\Arduino Kit Stuff\my sketches\Terrarium_Monitor_1.3 \Terrarium_Monitor_1.3.ino: In function 'void displayTime()':
Terrarium_Monitor_1.3:112: error: 'class DS3231' has no member named 'getTemp'
 lcd.print(rtc.getTemp()); //Displays Temperature from DS3231 designated as "External Temperature"
 ^
Multiple libraries were found for "LiquidCrystal.h"
 Used: E:\Program Files (x86)\Arduino\libraries\LiquidCrystal
 Not used: C:\Users\Ursinos\Documents\Arduino\libraries \arduino_136712
exit status 1
'class DS3231' has no member named 'begin'
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

Could this have anything to do with my Arduino IDE being version 1.8.3 instead of the newest version?

• Juraj: the I2C (Wire) pins SDA and SCL are constant on Uno. no need to give them into the constructor. change DS3231 rtc(SDA, SCL); to DS3231 rtc;
• Ursinos: huh, that's pretty weird since so many of the code examples I've come across have it entered like I had it.
• Juraj: because the libraries are cross platform and on some platforms you can choose the pins. and in new version they disabled for AVR the constructor with parameters

Answer 1

I found this online but I can not verify it.

http://www.instructables.com/topics/no-matching-function-for-call-to-DS3231DS3231const/

The relevant part for you I think is:

I don't know where you get the syntax

DS3231 rtc (SDA, SCL);

My copy of the DS3231 library says you need only DS3231 rtc; //no arguments. BUT you need the Wire library.

So change your code and make sure you have the Wire library.

• Ursinos: I have the wire library installed and included. I tried changing that segment of code and it did not help
• Ursinos: actually, I figured out what I did wrong the first time I tried changing it. It cleared the error for that one segment, Editing original post to show new errors.
• Juraj: so why did you accept the answer?
• Ursinos: because it was part of the problem

Answer 2

Alright, so I figured it out by gasp going and reading the documentation for the DS3231 library I'm using.

It seems when the library updated, one of the keywords changed.

so, after removing the (SDA, SCL) from the one line, I had to remove the line

rtc.begin();

and change

lcd.print(rtc.getTemp()); 

to

lcd.print(rtc.getTemperature());

thanks for the help :D

• Nick Gammon: Thanks for advising us of that. Personally I don't update the IDE very often. What is the point? I currently use 1.6.9. It works, and there is a danger if you upgrade then things stop working. It's not as if your Arduino has to connect to some new-fangled printer that was only released last week.