While many of us have banished land line telephones from our houses, there are still quite a few people who utilize POTS lines today. These analog phone systems use Dual Tone Multi Frequency (DTMF) ...

#define FEATURE_MEMORIES // on the Arduino Due, you must have FEATURE_EEPROM_E24C1024 and E24C1024 EEPROM hardware in order to compile this // #define FEATURE_MEMORY_MACROS #define ...