Introduction - If you have any usage issues, please Google them yourself
This document is the I2C bus to read and write EEPROM (AT24C02) test procedures the 1,2-foot jumper shorted JP6, JP10 shorted 1,2 feet, when the press KEY1, KEY2, KEY3 any key will correspond to key " 1" , " 2" , " 3" into the EEPROM, while digital has prompted, the program saves only the last key, when pressed KEY4, the program will read the last saved key, also showed the digital pipe.