how to loop a case till a new case is input

Projects Programming
1

i am using a key pad to control some led strips, it all works ok but i need case 2 to repeat until i select another case but i am struggling to find a way that works

 #include <Keypad.h>
#include <FastLED.h>
#define NUM_LEDS 20
#define NUM_STRIPS 2
int Speed = 15;



const byte ROWS = 4;
const byte COLS = 4;


CRGB dreamHead [NUM_LEDS];

char Keys [ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};
byte rowPins[ROWS] = {9, 8, 7, 6};
byte colPins[COLS] = {5, 4, 3, 2};

Keypad customKeypad = Keypad(makeKeymap(Keys), rowPins, colPins, ROWS, COLS);


void setup() {
  Serial.begin(9600);
  char customKey = customKeypad.getKey();
  FastLED.addLeds<NEOPIXEL, 13>(dreamHead, NUM_LEDS);
  FastLED.addLeds<NEOPIXEL, 12>(dreamHead, NUM_LEDS);
  if (customKey) {
    Serial.println(customKey);
  }

  fill_solid(dreamHead, NUM_LEDS, CRGB(0, 0, 0));
  FastLED[1].showLeds();

  fill_solid(dreamHead, NUM_LEDS, CRGB(0, 0, 0));
  FastLED[2].showLeds();


}
void fadeall() {
  for (int i = 0; i < NUM_LEDS; i++) {
    dreamHead[i].nscale8(200);
  }
}

void loop () {

  switch (customKeypad.getKey())
  {
    case '1':
      turnOn();
      break;
    case '2':
      startDream();
      break;
    case '0':
      turnOff();
      break;
  }
}


void turnOn() {
  fill_solid(dreamHead, NUM_LEDS, CRGB(0, 255, 0));
  FastLED[1].showLeds();
  fill_solid(dreamHead, NUM_LEDS, CRGB(0, 255, 0));
  FastLED[2].showLeds();
}

void startDream () {
  fill_solid(dreamHead, NUM_LEDS, CRGB(0, 255, 0));
  FastLED[1].showLeds();
  for (int i = 0; i < NUM_LEDS; i++) {
    dreamHead[i] = CRGB::Indigo;
    FastLED[2].showLeds();
    fadeall();
    delay(Speed);
  }


}


void turnOff() {
  fill_solid(dreamHead, NUM_LEDS, CRGB(0, 0, 0));
  FastLED.show();
}
2

Save the output from customKeypad.getKey() into a variable
Only enter the switch/case if the value indicates that a value has been read and use the value read as the switch value

3

have you got an example

4 
newInput = customKeypad.getKey();
if (newInput != NO_KEY)  //a key is pressed
{
  switchVariable = newInput;  //save the new value
}

switch (switchVariable)  //switch using the current value
{
  //cases go here
}
5

i have tried adding this to my code but im clearly doing it wrong as it wont accept it

6

Please post your complete amended code

7 
#include <Keypad.h>
#include <FastLED.h>
#define NUM_LEDS 20
#define NUM_STRIPS 2
int Speed = 15;



const byte ROWS = 4;
const byte COLS = 4;


CRGB dreamHead [NUM_LEDS];

char Keys [ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};
byte rowPins[ROWS] = {9, 8, 7, 6};
byte colPins[COLS] = {5, 4, 3, 2};

char key;
char state;

Keypad customKeypad = Keypad(makeKeymap(Keys), rowPins, colPins, ROWS, COLS);
int newInput = customKeypad.getKey();

void setup() {
  Serial.begin(9600);
   char customKey = customKeypad.getKey();
  FastLED.addLeds<NEOPIXEL, 13>(dreamHead, NUM_LEDS);
  FastLED.addLeds<NEOPIXEL, 12>(dreamHead, NUM_LEDS);
if (customKey) {
    Serial.println(customKey);
  }

  fill_solid(dreamHead, NUM_LEDS, CRGB(0, 0, 0));
  FastLED[1].showLeds();

  fill_solid(dreamHead, NUM_LEDS, CRGB(0, 0, 0));
  FastLED[2].showLeds();



}
void fadeall() {
  for (int i = 0; i < NUM_LEDS; i++) {
    dreamHead[i].nscale8(200);
  }
}

void loop () {
char newInput();
}


void newImput()
{newIput = customKeypad.getKey();
if (newImput !=NO_KEY)
{switchVariable = newImput;
}
switch (switchVariable)
 
    case '1':
      turnOn();
      break;
    case '2':
      startDream();
      break;
    case '0':
      turnOff();
      break;
  }
}


void turnOn() {
  fill_solid(dreamHead, NUM_LEDS, CRGB(0, 255, 0));
  FastLED[1].showLeds();
  fill_solid(dreamHead, NUM_LEDS, CRGB(0,255,0));
  FastLED[2].showLeds();
}

void startDream () {

  
  
  for (int i = 0; i < NUM_LEDS; i++) {
    dreamHead[i] = CRGB::Indigo;
    FastLED[2].showLeds();
    fadeall();
    delay(Speed);

  }

  
}


void turnOff() {
  fill_solid(dreamHead, NUM_LEDS, CRGB(0, 0, 0));
  FastLED.show();
}
8

got it working

#include <Keypad.h>
#include <FastLED.h>
#define NUM_LEDS 20
#define NUM_STRIPS 2
int Speed = 15;



const byte ROWS = 4;
const byte COLS = 4;


CRGB dreamHead [NUM_LEDS];

char Keys [ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};
byte rowPins[ROWS] = {9, 8, 7, 6};
byte colPins[COLS] = {5, 4, 3, 2};

char key;
char state;

Keypad customKeypad = Keypad(makeKeymap(Keys), rowPins, colPins, ROWS, COLS);
int newInput = customKeypad.getKey();

void setup() {
  Serial.begin(9600);
   char customKey = customKeypad.getKey();
  FastLED.addLeds<NEOPIXEL, 13>(dreamHead, NUM_LEDS);
  FastLED.addLeds<NEOPIXEL, 12>(dreamHead, NUM_LEDS);
if (customKey) {
    Serial.println(customKey);
  }

  fill_solid(dreamHead, NUM_LEDS, CRGB(0, 0, 0));
  FastLED[1].showLeds();

  fill_solid(dreamHead, NUM_LEDS, CRGB(0, 0, 0));
  FastLED[2].showLeds();



}
void fadeall() {
  for (int i = 0; i < NUM_LEDS; i++) {
    dreamHead[i].nscale8(200);
  }
}

void loop () {
listenForKey();
doStates();
}


void listenForKey()
{
  key = customKeypad.getKey();
  if (key !=NO_KEY)
  {state = key;
 Serial.println("a key was pressed");
  }
  else{
  Serial.print("waiting for key");
}
}

void doStates()
{
switch (state)
 {
    case '1':
      turnOn();
      break;
    case '2':
      startDream();
      break;
    case '0':
      turnOff();
      break;
  }
}


void turnOn() {
  fill_solid(dreamHead, NUM_LEDS, CRGB(0, 255, 0));
  FastLED[1].showLeds();
  fill_solid(dreamHead, NUM_LEDS, CRGB(0,255,0));
  FastLED[2].showLeds();
}

void startDream () {

  
  
  for (int i = 0; i < NUM_LEDS; i++) {
    dreamHead[i] = CRGB::Indigo;
    FastLED[2].showLeds();
    fadeall();
    delay(Speed);

  }

  
}


void turnOff() {
  fill_solid(dreamHead, NUM_LEDS, CRGB(0, 0, 0));
  FastLED.show();
}
9

Good news !