Fix Low memory available, stability problems may occur Arduino

There are three pools of memory in the microcontrollers used on Arduino boards (e.g. the ATmega168):

Flash memory (program space), is where the Arduino sketch is stored.
SRAM (static random access memory) is where the sketch creates and manipulates variables when it runs.
EEPROM is memory space that programmers can use to store long-term information.
Flash memory and EEPROM memory are non-volatile (the information persists after the power is turned off). SRAM is volatile and will be lost when the power is cycled.

Note: Flash (PROGMEM) memory can only be populated at program burn time. You can’t change the values in the flash after the program has started running.

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