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Topic: I want lock lcd after 50 times on and off (Read 1 time) previous topic - next topic


hi this is om  from mumbai india ,I am making one my  project using arduino at328 p pu controoler and I am using lcd 16x4. I have done all coding and my system is working good. I am display length by potentiometer 10k in meter.
I want to add one extra features please help.
I want to lock my screen after 50 times on and off.
After 50 times It wil ask a password that I will enter only then it will show the actual display


storing the on/off count in nonvolatile memory like eeprom inside microcontroller or outside device like 24c08 (2kb  eeprom) or sd card may help. i was not successful in inside eeprom but sucessful on sd card. i used it for commercial product.

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