The doorbot is responsible for scanning key fobs and unlocking the door for members. The software is written in Typescript and deployed to a Raspberry Pi. It expects to use the Wiegand protocol for reading fobs.

Implementation of the system is split up into a few repositories:

• https://github.com/frezik/doorbotts - The base system
• https://github.com/frezik/rpi-doorbot-ts - Raspberry Pi-specific code
• https://github.com/bodgery/bodgery-doorbot-ts - Bodgery-specific code

TODO: add deployment code repository.

There are currently two doorbots. “Edd” takes care of the cleanroom doors, and “Hodor” is in the woodshop. These both check that keys are valid using “Tyrion”, the main server for the member database.

A new doorbot can be built with the following components:

• 12V power supply: https://www.amazon.com/gp/product/B00D7CWSCG/ (if only driving a single solenoid lock, this can be slimmed down to 10A, or even 5A)
• 4x power supply holders: https://www.thingiverse.com/thing:2062755
• 120V power socket w/switch: https://www.amazon.com/URBEST-Module-Switch-Socket-IEC320/dp/B00ME5YAPK
• 5V voltage converter: https://www.amazon.com/gp/product/B00J3MHRNO
• Micro-USB cable (can be short)
• 3/8“ plywood sheet, 2'x4'
• Raspberry Pi (a multicore model is strongly recommended)
• Raspberry Pi mounting bracket: https://www.thingiverse.com/thing:2480304
• Raspberry Pi prototype breakout board (see below): https://www.amazon.com/gp/product/B07BF8Z3HS
• SD card (8GB or more, recommend A1 rated or better)
• DB9 port breakout board pair: https://www.amazon.com/gp/product/B071ZLNDYT
• Mounting bracket for DB9 (you'll need to use OpenSCAD to convert this to an STL): https://github.com/bodgery/bodgery-doorbot-ts/blob/master/hardware/cable-mount.scad
• 120mm computer fan: https://www.amazon.com/ARCTIC-F12-Standard-Configuration-possible/dp/B002KTVFTE
• Red and Black hookup wire
• Wood screws that won't poke through the plywood when you screw in the mounts
• 4-pin molex computer connector
• C13 power cable (standard computer power cable): https://www.amazon.com/gp/product/B005WKJQ4E

TODO: picture of the inside of a completed doorbot

First, make the box by cutting the plywood on a laser cutter using this pattern: https://github.com/bodgery/bodgery-doorbot-ts/blob/master/hardware/bodgery-doorbot-box.svg. Run off all the 3D printed parts (power supply holders, Pi bracket, DB9 bracket). Install Raspbian to the SD card.

Using the brackets, screw down the power supply and Raspberry Pi, as well as the 5V power converter and the fan. The Pi should be placed near the open slot in the back, so you can plug in an Ethernet cable later.

Cut the end off the micro-USB cable, with enough length to run between the Pi and the 5V power converter. Connect the power wire (usually red) to the 5V output, and the ground (black) line to ground. Use hookup wire to connect the 12V output from the power supply to the input of the 5V converter, as well as the ground line.

Connect the 12V line of the molex connector (yellow wire) to the 12V power supply output, as well as the two central ground pins on the connector. Connect this to the fan.

Connect the hot/neutral/ground wires of the power supply to the plug. WARNING: These connections will be handling 120V power. Be sure they are well insulated and appropriately sized.

At this point, you should be able to plugin everything and have the Pi bootup.

TODO: Instructions on building the breakout board

TODO: Instructions on wiring the DB9 port