Magnetic Door Lock with Secret Knock, IR Sensor, & Web App

In this project I build a magnetic lock for my home office, that opens if you know the secret knock. Oh… and it has a few more tricks up its sleeve too.

Code & Wiring Diagram: https://github.com/calebbrewer/secret-knock-magnetic-door-lock

App Code: https://codepen.io/calebbrewer/pen/dJKBmw

3D Models

49mm Electromagnet Mounting Bracket: https://www.thingiverse.com/thing:3189573

Sensor Cap/Cover: https://www.thingiverse.com/thing:3205430

Project Box: https://www.thingiverse.com/thing:3205421

Parts (Affiliate Links)

49mm Electromagnet: https://www.ebay.com/itm/88-LB-40kg-Electric-Lifting-Magnet-Electromagnet-Solenoid-Lift-Holding-49mm/172144498657?hash=item28149c97e1:g:mrIAAOSwtfhYpfpj:rk:1:pf:1

Perfboard: https://www.ebay.com/itm/32PCS-Double-Sided-PCB-Proto-Perf-Board-Through-Plated-2x8-3x7-4x6-5x7-7x9cm/253702194892?hash=item3b11d446cc:rk:1:pf:0

ESP8266 Dev Board: https://www.ebay.com/itm/NodeMcu-Lua-WIFI-Internet-Things-development-board-based-ESP8266-CP2102-module/201542946669?hash=item2eece54f6d:g:thoAAOSw5rBbOvnA:rk:5:pf:1&frcectupt=true

N-Channel MOSFET: https://www.ebay.com/itm/10pcs-FQP30N06L-FQP-30N06L-60V-LOGIC-N-Channel-MOSFET-TO-220/181026718383?epid=668235664&hash=item2a260882af:g:QfMAAOSwYXVYx21E:rk:2:pf:1&frcectupt=true

Piezo Transducer: https://www.ebay.com/itm/Luvay-12Pcs-Piezo-Pickup-Transducer-Prewired-27mm-Contact-Microphone-Trigge/392169765067?hash=item5b4f23b8cb:g:yu8AAOSwHu5b5Or7:rk:17:pf:0

IR Proximity Sensor (This is not the one I used, but I would get it & run it from the PSU): https://www.ebay.com/itm/HC-SR501-PIR-IR-Passive-Infrared-Motion-Detector-Sensor-Module-Arduino-HCSR501/382572427755?hash=item591317f9eb:rk:1:pf:0

Operational Amplifier Module: https://www.ebay.com/itm/2Pcs-LM358-100-Times-Gain-Signal-Amplification-Amplifier-Operational-Module-I-cl/232238643405?epid=926478297&hash=item36128078cd:rk:1:pf:0