Nuts and Volts - June 2017

the 32 levels can be aligned to the transitions of the five MSBs of an eight-bit digital-to-analog converter (DAC) so that the DAC output bits indicate the status of each door. Alternatively, the DAC could feed a microprocessor and lookup table to decipher the status of all five doors.

With a microprocessor, you could easily add alarm, arm, disarm, and logging features. Depending on the number of doors, a stabilized constant current square wave drive of the series string of diode modules would probably be required. I haven’t built this particular addition, so here is your opportunity for a design project and a follow-up article. NV

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