Switch case Trouble

Projects Programming
1

can i initialize the "case" in a switch case?

in my program i would like to start in the off "mode"

i get this error:
error: 'Mode' does not name a type; did you mean 'tone'?

where i try to do this
Mode =(0); //initial start in the off mode

// scope :  turn on and off a unit using the digital control fed to relay. The goal is to run the required cycle counts or till the unit dies
// On /off  requirement, example: 5 min on 3 min off.
// cycle counts are counted on an additional device. 
//this program only used to turn on and off unit. 


const int ledPin1 = 12; 

Onrequirement = 5;   //change on time here 
Offrequirement = 3;  //change off time here 

Mode  =(0); //initial start in the off mode

void setup() {
  Serial.begin(9600);
  pinMode(ledPin1, OUTPUT);
  
 
}

void loop() {
  
  switch (Mode);
  
    case 1; // On Mode
    
      if (Ontime  < Onrequirment)
       { 
        digitalWrite(ledPin1, HIGH);
        Ontime++;
        delay(5000);
        Serial.print Mode;
        Serial.println (Ontime);
       }

        Else  if 
        {
          Mode = 2;
          Ontime = 0;
        }

        break;

        
     case 2; // Off Mode
    
      if (Offtime  < Offrequirment)
       { 
        digitalWrite(ledPin1, Low);
        Offtime++;
        delay(5000);
        Serial.print Mode;
        Serial.println (Offtime);
       }

        Else  if 
        {
          Mode = (1);
          Offtime = 0;
        }

        break;
        
}
2

Start by fixing the basic problems with the sketch that you posted

For instance

Onrequirement = 5;   //change on time here
Offrequirement = 3;  //change off time here

Mode = (0);  //initial start in the off mode

This code is not in a function so will not compile

3 
    switch (Mode)
        ;

    case 1; // On Mode

And these too

  1. What is the first semicolon doing there ?

  2. case statements use a colon not a semicolon

4

Also you may want to read up on how switch()... case() works. You can do what you want much simpler with the proper code.

5

and this

      Else  if

That should be else rather than Else, and you don't have a condition for the else if anyway

6

oh, Are you saying it needs to be in the void setup instead?

7

I think you have to use case:

8

You could declare them as global variables and define their value outside of a function if that is what you want to do but they must have a data type in order to do that

What data type do you want those variables to have ?

9

There are so many errors in your code that it is difficult to describe them.
So I corrected it and I'm posting the corrected code.
I defined some variables that were not defined and assigned the value 0.

Hth

// scope :  turn on and off a unit using the digital control fed to relay. The goal is to run the required cycle counts or till the unit dies
// On /off  requirement, example: 5 min on 3 min off.
// cycle counts are counted on an additional device.
//this program only used to turn on and off unit.

const int ledPin1 = 12;
int Onrequirement = 5;   //change on time here
int Offrequirement = 3;  //change off time here
int Ontime = 0;
int Offtime = 0;
int Mode  = 0; //initial start in the off mode
//------------------------------------------------------------------
void setup() {
  Serial.begin(9600);
  pinMode(ledPin1, OUTPUT);
}
//------------------------------------------------------------------
void loop() {
  switch (Mode) {
    case 1: // On Mode
      if (Ontime  < Onrequirement) {
        digitalWrite(ledPin1, HIGH);
        Ontime++;
        delay(5000);
        Serial.print (Mode);
        Serial.println (Ontime);
      }
      else  {
        Mode = 2;
        Ontime = 0;
      }
      break;
    case 2: // Off Mode
      if (Offtime  < Offrequirement) {
        digitalWrite(ledPin1, LOW);
        Offtime++;
        delay(5000);
        Serial.print( Mode);
        Serial.println (Offtime);
      }
      else {
        Mode = (1);
        Offtime = 0;
      }
      break;
  }
}
10

You can absolutely do what you are aiming for. Any code you wanna write can be in a switch/case case.

But you'll have to get the pesky syntax right and as has been said…

… this may not be the best way to accomplish whatever it is your goal.

a7

11

i was planning on
1 for on mode (case 1)
2 for off mode (case2 )

12

yes i think that is my biggest handycap the syntax

13

Compare your code with the code by @ruilviana in post #9 and learn from it :wink:

14

The syntax is not difficult and your faults have been pointed out to you

  1. The switch statement does not end with a semicolon
  2. The case statements end end with a colon, not a semicolon
  3. Variables must be declared with a data type
  4. Variables can be defined as part of the declaration
  5. The else statement is all lowercase, not Else
  6. else/if requires a condition
  7. You can give the switch variable a value before the switch/case is executed for the first time. Indeed, the switch variable must have a value before the switch/case is executed
15

ur update works as i intended, i need to improve on my syntax and learn some basic concepts of Arduino.

i was close 80 % but no cigar
thanks everyone for the input.

i will save this as one of my templates for later projects