It depends on what you are doing.
The cyclic redundancy check will only detect an error, while the hamming code can also correct many types of errors. However to perform this correction the extra error detection parity bits required in hamming code are many more than the bits needed for cyclic redundancy check, per data byte being checked.
Normally cyclic redundancy check is done on large block of data that can be resent or retried to get the correct block of data (e.g. telecommunication channels, disk sectors).
Normally hamming code is done on individual bytes or words of computer memory.
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There are different types of industrial timer like ON Timer, OFF timer, Cyclic Timer, sequential timer there basic function is the same to turn ON/OFF devices at particular time or after a specific durations check this link for a simple microcontroller based ON timer where where a device is turned ON for a specific duration after a switch is pressed http://www.dnatechindia.com/index.php/Code-Library/8051_ASSEMBLY/ON-Timer-Program.html here is another link for adjustable cyclic timer where a device is turned ON/OFF continuously for a specific duration http://www.dnatechindia.com/index.php/Kits/Microcontroller-Kits/Adjustable-Cyclic-Timer.html
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Yes. You can check the datasheets and will see that MKP has better properties than MKT. But MKT is cheaper.
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