Layout Control Mother Board

Posted on Feb 7, 2014

The purpose of the layout control mother board is to provide a simple way to allow people to control portions of their layout. The layout control motherboard consists of a single microcontroller that interfaces to the MRNet bus and a number of slots into which inexpensive control and sensor boards can be plugged in. All of the control and sensor b

Layout Control Mother Board
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oards share the single microcontroller on the motherboard. The sensor and control boards that plug into the layout control mother board are meant to be quite inexpensive. The interface circuitry that must be on each control and sensor card consists of 1 74LS14 Hex Schmitt Trigger (Jameco 46640 @ $. 25 ea) and 1 74LS165 8-bit shift register (Jameco 46877 @ $. 49 ea). The motherboard provides regulated 5 volts to each board using a simple 7805 based power supply. In addition, the boards are provided unregulated positive and negative voltages that can be used to switch relays and the like. This control board provides a means to independently control up to 32 LED`s. The LED`s can be either simple ones or tri-color LED`s. This board should be useful for building a turnout control panel, lighting track-side signal lights, of lighting individual building lights. This control board provides a means to sense up to 24 distinct inputs. These inputs can be buttons on a turnout control panel, turnout sensors, etc. Debouncing for SPST switches is done in software, whereas a DPST switch occupies two inputs. The controller talks to the control and sensor boards via a simple 4 wire bus. Each board implements a long shift register of 8-bit bytes. The output of control and sensor board is directed to the input of the next sensor board. The output of the last sensor board is automatically routed back to the microcontroller for reading. A...

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