ESP8266-Arduino programming example-EEPROM read and write

EEPROM read/write

EEPROM (also known as E2PROM), which stands for Electrically Erasable Programmable Read Only Memory, is a non-volatile memory used in computers that is integrated in microcontrollers used in smart cards and remote keyless systems, andOther electronic devices store relatively small amounts of data by allowing individual bytes to be erased and reprogrammed.

EEPROMs are organized as arrays of floating gate transistors.EEPROM can be programmed and erased in-circuit by applying special programming signals.Originally, EEPROMs were limited to single-byte operations, which made them slower, but modern EEPROMs allow multi-byte page operations.EEPROMs have a limited erasing and reprogramming lifetime, now reaching one million operations in modern EEPROMs.In frequently reprogrammed EEPROMs, EEPROM lifetime is an important design consideration.

ESP8266 has 512 bytes of internal EEPROM which can be useful if you need to store some settings like IP address or some Wifi details.

1. Hardware preparation

• ESP8266 NodeMCU development board
• A data cable

2. Software preparation

• Arduino IDE or VSCode + PlatformIO

In the previous article, I gave a detailed introduction to how to build the ESP8266 development environment, please refer to:

• Development environment-based on Arduino IDE
• Development environment construction-based on PlatformIO

The pin introduction of ESP8266 NodeMCU is described in detail in the previous article, please refer to:

• Meet the ESP8266

3,