PROGMEM - Arduino Reference

Keep constant data in flash (program) memory only, instead of copying it to SRAM when the program starts. There’s a description of the various types of memory available on an Arduino board. The PROGMEM keyword is a variable modifier, it should be used only with the datatypes defined in pgmspace.h. It tells the compiler "keep this information in flash memory only", instead of copying it to SRAM at

[delhicurry]

sharpのエアコンには、212個の要素の配列が必要となり、３つ以上用意すると、SRAM不足で動作しないので、メモリ退避が必要。

[mickey24]

PROGMEM enables us to store data in flash (program) memory instead of SRAM.