Hi. i am working on a alarm system project use a Arduino to read 8 inputs which are coming through a 8 stage static register ( CD4021BE) i am have a problem now which switch has been closed and which one is open i need some help with the programming to now which input is which i have found some cod…

home alarm system

billcramer07 January 28, 2011, 5:37am 3

Have a look at this Security Sensor Shield for Arduino | Freetronics
It may simplify your project.

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