hw07sol - is HIGH This closes a relay which turns on the...

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SOLUTION 1/2 ECSE-2610 Computer Components and Operations Homework # 07: Four-way switch design Due Wednesday, March 24, 2010 in studio 1. Block diagram of Stair Lights, Switches, and Controller: 125V AC Relay Lights 3 floor switches / 3 w i r e s Parity checker Cut-off Master Switch 2. Truth Table: T0 T1 T2 T3 GO 0 X X X 0 1 0 0 0 0 1 0 0 1 1 1 0 1 0 1 1 0 1 1 0 1 1 0 0 1 1 1 0 1 0 1 1 1 0 0 1 1 1 1 1 4. Description Three SPDT switches (T1, T2, T3) are connected to +5V and Ground. The outputs of these switches are connected to an EXLUSIVE NOR (XNOR) gate D00001. Flipping any switch negates the output of the XNOR gate. The output of D00001 is combined with the output of the master switch T0 by means of AND gate D00002. The output of D00002 is connected to terminal GO. When the output of D0001 is LOW and the master switch is HIGH (+5V), the output of D00002, which is connected to terminal GO,
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Unformatted text preview: is HIGH. This closes a relay which turns on the lights. When GO is LOW (0V), the relay opens, interrupts the current, and the lights go off. SOLUTION 2/2 3. Logic Diagram: T0 T3 T2 T1 GO MYSWITCHES GN SECTION 000 March 15, 2010 +5V Master Swutch 1 D0001 D0002 MASTER-OFF_LOW FIRST-FLOOR SECOND_FLOOR GROUND-FLOOR LIGHTS-ON LOW LIGHT 5. Parts List Circuit: SWITCHES Date: Wednesday, October 14, 2009 - 8:55 PM Device Type Num. Used Value References AND-2 (1-Inv) 1 D0002 xnor_3 1 D0001 5V Power Supply, wires, circuit board 6. Netlist +5V FIRST-FLOOR D00001- GO D0002-3 GROUND-FLOOR D00001- Ground MASTER-OFF_LOW D0002-1 S00001 D00001- D0002-2 SECOND_FLOOR D00001- [[A three-input EXOR and an AND gate without an inverting input would also work.]]...
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This note was uploaded on 01/27/2011 for the course ECSE 2610 taught by Professor Ji during the Spring '08 term at Rensselaer Polytechnic Institute.

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hw07sol - is HIGH This closes a relay which turns on the...

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