Doorbot
Doorbot is a door entry system for my house. It has four main components:
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Keypad & RFID reader unit outside the front door
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Arduino with code to read the keypad and send packets over Ethernet. Housed in a laser cut wooden box
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Raspberry Pi running (awful) Python code, connected to a dual relay board
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Two 12V electromagnet door strikes (outer porch door and inner door)