To write data into the EEPROM, you use the EEPROM.write() function that takes in two arguments. To include the EEPROM library: #include Write You can easily read and write into the EEPROM using the EEPROM library. We’ll exemplify this with an example later in this post in the Example: Arduino EEPROM remember stored LED state. To solve this problem, you can save the lamp’s state in the EEPROM and add a condition to your sketch to initially check whether the state of the lamp corresponds to the state previously saved in the EEPROM. You want the Arduino to remember what was happening before losing power and return to the last state. When the power backs on, the lamp stays off – it doesn’t keep its last change.You’re controlling a lamp with your Arduino and the lamp is on.It is specially useful to remember the last state of a variable or to remember how many times an appliance was activated.įor example, imagine the following scenario: The EEPROM is useful in Arduino projects that need to keep data even when the Arduino resets or when power is removed. Applications in Arduino projects – Remember last state This means you can read from the EEPROM as many times as you want without compromising its life expectancy. In Arduino, the EEPROM is specified to handle 100 000 write/erase cycles for each position. However, if you need to store more data you can get an external EEPROM. Take a look at the table below: Microcontroller The bytes you can store on EEPROM dependson the microcontrollers on the Arduino boards. How many bytes can you store?Įach EEPROM position can save one byte, which means you can only store 8-bit numbers, which includes integer values between 0 and 255. In Arduino, you can read and write from the EEPROM easily using the EEPROM library. The EEPROM can be read, erased and re-written electronically.
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