Storing Array of Strings in Program Memory

Projects Programming
1

So I want to conserve RAM by storing my array of Strings for my LCD in the flash memory of my arduino ATMega328P. I am using v. 1.6.7 of the IDE. When I upload this code without the array it runs correctly, however with the array it compiles and uploads but the LCD is blank...

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
//#include <avr/progspace.h>
#define num_saved_wands 5
#define I2C_ADDR    0x27
#define BACKLIGHT_PIN     3
#define En_pin  2
#define Rw_pin  1
#define Rs_pin  0
#define D4_pin  4
#define D5_pin  5
#define D6_pin  6
#define D7_pin  7
LiquidCrystal_I2C  lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);


void setup() {
  lcd.begin (16,2); 
  lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
  lcd.setBacklight(HIGH);
  lcd.home();
  lcd.print(F(" Welcome to the"));  
  lcd.setCursor (0,1);
  lcd.print(F(" LCD"));
  delay(2000);
  lcd.clear();
 
}//end setup

PROGMEM const String Menu[9][4] = {
  {"Adjs","Imgs","Text","Functions"},   //1
  {"1-Wand","2-Bands","Rainbow", ""},//2   //Adjust
  {"1-Saved","2-Create","3-Main",""},  //3   //Adjust --> Wand
  {"1-Saved","2-Create","3-Main",""},  //4   //Adjust --> Bands
  {"Main","","",""},                           //5   //Adjust --> Rainbow
  {"Run","Main","",""},                      //6   //Imgs
  {"1-Saved","2-Create","3-Main",""},  //7   //Text      
  {"Run","Main","",""},                      //8   //Text Run
  {"Main","","",""}                            //9   //Functions
};

void loop() {
}//end loop

Thanks.

2

See the example at nongnu.org for PROGMEM which shows how to use PROGMEM for arrays of strings. (Google)

Mark

3

holmes4:
See the example at nongnu.org for PROGMEM which shows how to use PROGMEM for arrays of strings. (Google)

Mark

Not that strings and Strings are NOT the same thing. One can store strings in PROGMEM. One can NOT store Strings in PROGMEM.