Help Lcd1602 + Esp12F Arduino Project

Projects General Guidance
1

Hello

I would like to done a project domotic with a old Lcd shield 1602 and a Esp12F

I have followed this video :

I have test the two files INO of this video I have succeed for a Arduino file here :

#include <LiquidCrystal.h>
const int rs=D1, en=D2, d4=D4, d5=D5, d6=D6, d7=D7;
LiquidCrystal lcd(rs,en,d4,d5,d6,d7); //select the pins used on the LCD panel

void setup(){
  
   lcd.begin(16, 2);
   lcd.clear();
   Serial.begin(9600);    
}
 
void loop(){

 lcd.setCursor(0,1);
 lcd.clear();
 lcd.print(analogRead(A0)); //read anolog pin A0
 delay(100);
 Serial.println("Moniteur Série prêt");
 Serial.println(analogRead(A0));

}

For the second file INO here I have error :

#define SELECT_KEY   1
#define LEFT_KEY     2
#define DOWN_KEY     3
#define UP_KEY       4
#define RIGHT_KEY    5

#include <LiquidCrystal.h>
const int rs=D1, en=D2, d4=D4, d5=D5, d6=D6, d7=D7;
LiquidCrystal lcd(rs,en,d4,d5,d6,d7); //select the pins used on the LCD panel

int menuPos = 0;

String menuLines[6] =
{
  "Settings",
  "Reset",
  "Main Site",
  "Server IP",
  "Get Data",
  "Return"
};

void setup() {

  lcd.begin( 16, 2 );
  
}

void loop() {

   lcd.clear();
   lcd.print(">"); lcd.print( menuLines[ menuPos ] );
   lcd.setCursor(0, 1); lcd.print( menuLines[ menuPos + 1] );

   if( getKeyID() == UP_KEY ) menuPos--;
   if( getKeyID() == DOWN_KEY ) menuPos++;

   if( menuPos < 0 ) menuPos = 0;
   if( menuPos > 5 ) menuPos = 5;

   delay(100);
  

}

int getKeyID()
{
  int aRead = analogRead( A0 );

  if( aRead > 500 ) return 0;                //no key is pressed
  if( aRead > 420  ) return SELECT_KEY;      //select key 
  if( aRead > 350  ) return LEFT_KEY;        //left key
  if( aRead > 300  ) return DOWN_KEY;        //right key
  if( aRead > 150   ) return UP_KEY;         //up key
  if( aRead < 30   ) return RIGHT_KEY;       //right key
}

Here the error I have at the compilation :

C:\Users\Claude\Documents\Sketchs Arduino\nodemcu-lcd-shield-main\shield_ENG\shield_ENG.ino: In function 'int getKeyID()':
C:\Users\Claude\Documents\Sketchs Arduino\nodemcu-lcd-shield-main\shield_ENG\shield_ENG.ino:56:1: error: control reaches end of non-void function [-Werror=return-type]
   56 | }
      | ^
cc1plus.exe: some warnings being treated as errors

exit status 1

Compilation error: control reaches end of non-void function [-Werror=return-type]

Does anyone has an explanation, sorry I'am newbee with arduino

2

Hello
I have found a response (for the general culture or Arduino....and all the new bee like me)

It needeed to add a line at the end "return 0"

The sketche become like this :


#define SELECT_KEY   1
#define LEFT_KEY     2
#define DOWN_KEY     3
#define UP_KEY       4
#define RIGHT_KEY    5

#include <LiquidCrystal.h>
const int rs=D1, en=D2, d4=D4, d5=D5, d6=D6, d7=D7;
LiquidCrystal lcd(rs,en,d4,d5,d6,d7); //select the pins used on the LCD panel

int menuPos = 0;

String menuLines[6] =
{
  "Settings",
  "Reset",
  "Main Site",
  "Server IP",
  "Get Data",
  "Return"
};

void setup() {

  lcd.begin( 16, 2 );
  
}

void loop() {

   lcd.clear();
   lcd.print(">"); lcd.print( menuLines[ menuPos ] );
   lcd.setCursor(0, 1); lcd.print( menuLines[ menuPos + 1] );

   if( getKeyID() == UP_KEY ) menuPos--;
   if( getKeyID() == DOWN_KEY ) menuPos++;

   if( menuPos < 0 ) menuPos = 0;
   if( menuPos > 5 ) menuPos = 5;

   delay(100);
  

}

int getKeyID()
{
  int aRead = analogRead( A0 );

  if( aRead > 500 ) return 0;                //no key is pressed
  if( aRead > 420  ) return SELECT_KEY;      //select key 
  if( aRead > 350  ) return LEFT_KEY;        //left key
  if( aRead > 300  ) return DOWN_KEY;        //right key
  if( aRead > 150   ) return UP_KEY;         //up key
  if( aRead < 30   ) return RIGHT_KEY;       //right key

  return 0;
}
3

Working now?

4

If you have problems "String()"

Try an array of strings


char *menuLines[] = {
  "Settings",
  "Reset",
  "Main Site",
  "Server IP",
  "Get Data",
  "Return"
};

The following probably happens when you go "below" SETTINGS or "above RETURN... you do not error check for too many UP_KEY or DOWN_KEY

Compilation error: control reaches end of non-void function [-Werror=return-type]
5

@Railroader

Yes the solution I propose give 100% results and the sketche function all OK

@xfpd

I will try in the next day your proposition of solution for complete the post and help anyone
Thanks

6

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