sp auto door unlocker
TRANSCRIPT
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SP Office Gadget: Auto Door Unlocker
Hackware v3.0 (3 May 2017)SP Digital Tech Talk (29 Dec 2016)
By: Yeo Kheng Meng ([email protected])https://github.com/yeokm1/sp-auto-door-unlocker
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Problem?
• Tap staff pass on exit• Trouble for visitors
• Hassle of taking out pass
• Solution: • Exit without tapping pass
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Demo Video
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https://www.youtube.com/watch?v=IeWPlm1Xaz0
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Wireless remote unlocker
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• 12V battery source
• 2 buttons• DIP code-select switch
• Voltage-controlled oscillator (VCO)• Frequency determined by voltage
• 330Mhz SMC5326P-3• Some China chip• Unknown function• Cannot locate data sheet
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How the button triggers the signal?
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An electronic switch: Transistor
• Control current flow with another current flow
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The trigger: Active IR + Ultrasonic Sensor
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• Ultrasonic HC-SR04 v2• 3.3V logic compatible• Physical Domain
• Infrared (IR) Distance Sensor GP2Y0A21YKR• Effective range: 10 to 80cm• Active IR• Electromagnetic domain
• => Multi-modal integration / Sensor Fusion to avoid errors
Source: http://education.rec.ri.cmu.edu/content/electronics/boe/ir_sensor/1.html
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The brain: Microview
• Microview = Arduino + 64x48 OLED screen
• Runs on ATmega328P chip as with Arduino Uno
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= +
Source: http://makezine.com/2014/03/25/interview-with-marcus-schappi/
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Wireless Remote Modification
• Extend button circuit (brown)
• External 12V power (red and black)9
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Assembly
• Additional Components• Breadboard
• 12V DC Power Adapter
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Final Product
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Control 12V signal with 5V
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Source: https://electronics.stackexchange.com/a/70246
• Microview 5V Logic Level
• Remote is 12V Logic Level
• -> Active-Low Dual NPN transistor