Great question—this is exactly the kind of detail that saves you from prematurely wearing out your EEPROM down the line! Let’s break this down clearly:

核心结论：写入与已存储值相同的变量，不会消耗EEPROM的擦写周期 #

Here’s why:

• EEPROM cells work by first erasing a cell (setting all bits to 1) before writing new data (flipping specific bits to 0). A full "erase-write" cycle is what counts against the 100,000 limit.
• The Arduino EEPROM.put() function is smart enough to compare the existing value in the EEPROM with the value you’re trying to write. If they’re identical, it skips the entire write process entirely—no erase, no write, no cycle used.

对你的24小时复位场景的建议 #

Since you’re doing a daily software reset and need to persist parameters between resets:

• Whenever your Arduino boots up, you can safely use EEPROM.get() to load your saved parameters.
• When you receive a serial command to update a parameter, use EEPROM.put() to save the new value. Only this update will count as a cycle (if the value actually changed).
• For your daily reset: if you’re just reloading the existing parameters without modifying them, calling EEPROM.put() again with the same values won’t touch the EEPROM at all—so no cycles get wasted here.

额外小提示 #

If you ever want to verify this behavior, you can add a quick debug check: read the current EEPROM value first, compare it to the value you want to write, and only call EEPROM.put() if they differ. Though honestly, the built-in put() function already handles this for you, so it’s just a redundant sanity check if you’re feeling cautious.

With 100,000 cycles, even if you updated a parameter every single day, that’s over 270 years of use—so your setup is totally safe from EEPROM wear under normal conditions.

内容的提问来源于stack exchange，提问作者user7320967