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Analog PLC


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I'm a student in final year but I don't have background in electrical. So I have a lot of problem when i make an analog PLC using at90s8535.


The main problem that i'm dealing right now is what kind of external memory that i should use. at90s8535 support SPI for communication with other device, but I can't find serial eeprom that support SPI here. I tried to use at24c04, which only support I2C, but i'm still confused about how to generate or receiving the 'acknowledge' thing....;p;


So is there anybody can help me with this problem or giving me sample interface program.....?


Thank you very much......




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