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Building a Home Security System with BeagleBone by Bill Pretty

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Chapter 6. Automating Stuff

In the previous chapters we built and tested hardware for our alarm system. If you recall, the basic system came with four optically isolated outputs. If we assume that one output will be used to activate the strobe light and/or a siren (you can hook the two in parallel so long as they are both the same voltage, using a relay as shown at the end of Chapter 4, Building the Hardware), we are then left with three unused outputs. The BeagleBone adapter board also gives us the hardware capability to drive even more outputs. So now I am going to give some ideas about things you can do with these leftover outputs.

The low-current solenoid driver

The low-current solenoid driver circuit can be used to control things such as the ...

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