If you need more memory for Arduino projects and EEPROM in ATmega chip is too limited then this I2C EEPROM module is your best choice. It is based on the EEPROM AT24C256 chip with a capacity of 256 Kb. It communicates with Arduino via I2C bus, facilitates much easier data storage and increases Arduino design possibilities. Technical data Supply voltage: 1.5 - 5V used memory: 24C256 output: goldpin header connector r = 2.54mm number of pins: 4 dimensions: 20x12mm cable length: 20cm Chip above base code: 2ECL capacity 256kb AT24C256 CHIPs on the motherboard; Communication includes built-in I2C pull-up resistors on the board; All pins are guided and marked; https://elecena.pl/product/22620520/memory-module-at24c256-24c256-eeprom-to-i2c-arduino 2023-02-22 https://elecena.pl/product/22620520/memory-module-at24c256-24c256-eeprom-to-i2c-arduino 2025-10-29