107 lines
6.6 KiB
Plaintext
107 lines
6.6 KiB
Plaintext
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SCHEMATIC FOR AN OPTOELECTRONIC KEY LOCK
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BY JOE SCHARF
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* DENOTES A CONNECTED WIRE OR A FOOTNOTE
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_______________________________________________________________________________
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o------*------------------------------------------------------------------+
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| +-----*---*---*---*-----------*----------------*----*----- |
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| --- --- | | | | | | |
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| ^ ^ |+ | | | R5> | | *
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| T1 |D1-D4|C1--- > > | R4 10K> Q2 | |
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)||(---* | ^^^ > > +---^^^-*----+ > E/ )||
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)||( | | | R1> R2> | | *--[B )||
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)||(---|-----* | | | | | R6> C\ )||
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| | | | | *-----+ | | > | |
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| --- --- | | | | | | > | |
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| ^ ^ | | +---+ | | PC3v C/ | +---+
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| | | | v C/ | | --- [B | *-----+
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115V | | | | ---PC1 [B | Q1 C/ | E\ o o |
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60 Hz | +-----*---* | E\--|--+ +--*---[B | | |SSR| R7>
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| | v C/ | | | E\ PC4v C/ o --- >
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| | ---PC2 [B | |R3> | --- [B | --- >
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| | | E\--*--+ > | | E\ o | C2 |
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| | | > | | | | o ---
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| | | | |PC5v C/ | | ---
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| | | | | --- [B | | |
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| | | | | | E\ | | |
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| | | | | | | *-----+
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| +---*------------------*-----*---*--------*---+ |
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o-----+--------------------------------------------------------------------+
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_______________________________________________________________________________
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PARTS LIST
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T1: 115 TO 6.3V,.6A:STANCOR P-6465 OR TRIAD F-13X
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D1-D4: 1N4000 OR SIMILAR
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C1: 500 uF/10V ELECTROLYTIC
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C2: .05 uF/200V
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SSR (Solid State Relay): CRYDOM D1202 OR EQUIVALENT
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R1,R4: 120 OHM,.50W
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R3,R5: 10K,.50W
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R2,R6: 6.8K,.50W
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R7: 470 OHM, .50W
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Q1: 2N5172 OR ANY GENERAL PURPOSE NPN
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Q2: 2N5354 OR ANY GENERAL PURPOSE PNP
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PHOTOCOUPLERS: (PC):GE H13A1 OR EQUIVALENT
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SOLENOID: ANY 120V UNIT UP YO 1A COIL CURRENT SUCH AS GUARDIAN 2HD-120VAC
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FOOTNOTE---
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* - SOLENOID - JUST MAKING SURE YOU KNOW WHAT THIS PART IS.
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NOTE: THE NUMBER OF PHOTOCOUPLERS CAN BE FROM TWO TO SIX. SEE BELOW.
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_______________________________________________________________________________
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THIS PROJECT USES A SOLID STATE RELAY TO DRIVE A SOLENOID. IT IS CONTROLLED BY
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A PHOTOCOUPLER TRANSISTOR CIRCUIT. THE PHOTOCOUPLERS (PC'S) USED ARE OF
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INERRUPTER TYPE. HEY HAVE A .12 BY .30-INCH SLOT BETWEEN LED EMITTER
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AND TRANSISTOR DETECTOR. WHEN THE SLOT IS EMPTY OR FILLED WITH AN
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INFRARED TRANSMISSIVE MATERIAL, THE PHOTOTRANSISTOR WILL CONDUCT CURRENT IN
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RESPONSE TO THE LIGHT OF THE LED. IF THE SLOT IS FILLED WITH AN OPAQUE, THE
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TRANSISITOR WILL REMAIN OFF. THE ENTIRE SLOT IS NOT SENSITIVE. THE SENSITIVE
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PART IS ONLY A SMALL SIXTY-MIL AREA WITHIN THE GAP. IF AN OBJECT IS PLACED
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IN THE SLOT WITH A SIXTY-MIL HOLE IN THE CORRECT LOCATION, THE LED LIGHT WILL
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GET THROUGH TO THE TRANSISTOR. THE KEY LOCK USES AN ARRAY OF THESE
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INTERRUPTER PC'S WHICH ARE MIXED SO THAT ONLY THE CORRECT "LIGHT COMBINATION"
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WILL OPEN THE LOCK. WITH 4 PC'S THERE ARE 16 COMBINATIONS 5 GIVES 32 AND
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SO ON. THE CIRCUIT AS SHOWN CONTAINS 5 PC'S THE CIRCUIT WITHOUT CHANGING
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RESISTOR VALUES CAN ACCOMODATE FROM FOUR TO SIX PC'S WITH TWO OR THREE USED
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THE OPEN (NO LIGHT AS IN PC1 AND PC2) OR THE CLOSED MODE (LIGHT ON THE
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TRANSISTOR DETECTOR AS IN PC3-PC5) TO EXPAND THE OPEN TO FOUR COUPLERS
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R1 SHOULD BE REDUCED TO 82 OHMS AND ALL FOUR EMITTERS CONNECTED IN SERIES
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AND THE DETECTORS IN PARALLEL. TO EXPAND THE CLOSED COUPLERS TO FOUR,
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R4 MUST BE REDUCED TO 82 OHMS AND R2 AND R6 TO 5.6K
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TO ASSEMBLE THE ARRAY THE COUPLERS SHOULD BE CAREFULLY GLUED TOGETHER
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A SMALL AMOUNT OF EPOXY OR ONE OF THE SUPER GLUES ON ADJACENT SIDES
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WILL HOLD THIS ARRAY ANY EXCESS PLASTIC SHOULD BE TRIMMED WITH A SMALL BLADE
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TO INSURE THAT THE CENTERS ARE AT CONSTANT SPACINGS ALSO THE SLOTS MUST BE
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KEPT IN LINE ALONG BOTH THE TOPS AND SIDES OR PROBLAMS WILL RESULT LATER ON
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CARE MUST BE TAKES THAT NO GLUE GETS IN THE SLOTS ON THE DETECTORS OR
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EMITTERS. A SMALL PIECE OF PLASTIC OR METAL IS GLUED ON ONE ENDTO ACT AS A STOP
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FOR THE KEY, AND A COVER IS GLUED TO THE TOP OF THE SOUPLERS. THIS FORMS A
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TUNNEL OR KEYWAY.
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THE KEY CAN BE BUILT OUT OF PLASTIC OR METAL. THE LENGTH IS DETERMINED
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BY THE NUMBERS OF PC'S USED IN THE LOCK. ALLOW ONE-QUARTER INCH OF THE ENTIRE
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FOR EACH PC PLUS TWO INCHES FOR A HANDLE. IF THE KEY IS CUT PRECISELY, IT
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WILL SLIDE INTO THE TUNNEL WITHOUT MUCH UP AND DOWN PLAY. AT THIS POINT
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THE COMBINATION IS DETERMINED. DRILL A 1/16-INCH DIAMETER HOLE (ONLY AT
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THE CENTERS CORRESPONDING TO THE PC'S USED IN THE CLOSED MODE) THE HOLE
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PLACEMENT MUST BE ACCURATE. IF YOU DO NOT HAVE THE PROPER TOOLS
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TO ACCURATELY LOCATE THE HOLES, USE A LARGER DRILL BIT TO INSURE
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THAT THE LIGHT PATH IS CLEAR.
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THE ELECTRONICS CAN BE ASSEMBLED WITHIN A 4X5X6-INCH BOX
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THE PHOTOCOUPLER ARRAY CAN BE MOUNTED ON A PREFORATED CIRCUIT BOARD
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USING SEVERAL OF THE HOLES ON THE PC'S THE OPEN END OF THE PC TUNNEL SHOULD
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BE PLACED AT THE EDGE OF THE BOX WITH A HOLE LARGE ENOUGH FOR THE KEYTO ENTER
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THE TUNNEL. WHEN MAKING THE PC DISPLAY, MAKE SURE THAT THE CONNECTORS OF
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OF THE NORMALLY OPEN AND NORMALLY CLOSED COUPLERS ARE NOT INTERCHANGED
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ONCE THE UNIT IS ASSEMBLED, INSERTING THE KEY SHOULD ENERGISE THE SOLENOID
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IF NOT CHECK THE COLLECTOR VOLTAGE OF Q1.
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_______________________________________________________________________________
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WELL, THIS IS IT I GOT IT OUT OF A BOOK CALLED OPTOELECTRONICS GUIDEBOOK
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IF YOU HAVE ANY QUESTIONS LEAVE E-MAIL ON CHUCKS PLACE (304-776-7078)
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TO JOE SCHARF HOPE YOU ENJOY THIS AND IF YOU HAVE ANY UPLOAD THEM TO THE
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BOARD.
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_______________________________________________________________________________
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