![]() ![]() Int ledState = LOW // ledState used to set the LED variables that do not need to be saved Int interval = 1000 // interval at which to blink (milliseconds) =Ĭonst byte EEPROM_ID = 0x99 // used to identify if valid data in EEPROMīyte ledPin = 13 // the number of the LED pin Description : Blink LED with rate store in Arduino Build-in EEPROM Listing 5-1: Blink LED with rate value store in Arduino Build-in EEPROM /*= This sketch blinks an LED using values read from EEPROM and allows the values to be changed using the Serial Monitor: ![]() Use the EEPROM library to read and write values in EEPROM memory If you want to store more data than this, it might be time to think about using SD cards. NOTE: Any data written to the EEPROM remains there even when the Arduino boards is switched off.Ī good use of the EEPROM library would be to store settings in between Arduino restarts-for example, constants that might be used by an LCD interface, data in a counting application, or the highest score in a game. Reads the value of a byte stored at a location in EEPROM Table 5.2: The functions available in the EEPROM library Function The EEPROM library gives sketches access to the Arduino’s EEPROM and provides two functions, read and write, as shown in table 5.2. Arduino Mega board is based on an ATMega2560 it has 4,096 bytes of EEPROM memory. NOTE: The Arduino Uno is based on an ATMega328 it has 1,024 bytes of EEPROM memory. ![]() Table 5.1 EEPROM memory on microcontrollers used on Arduino boards Microcontroller Table 5.1 lists the amount of EEPROM memory available on the microcontrollers used on different Arduino boards. The amount of EEPROM on an Arduino board is dependent on the microcontroller at its core.
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