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Access Controller Gen2

The purpose of this wiki is to document the software and hardware design of the Second Generation Makerspace RFID access controllers.

Hardware outline

• Based on Rasperry Pi Pico W
• Firmware written in Rust
• Stores hashmap of valid RFID card hashes on onboard flash so can run without continuous network connectivity
• Checks with server and updates hashmap every 5 mins if required
• Provides logging updates to the server (queued if offline) to allow device usage to be tracked

Variants

• Mains powered (240VAC input) PCB

• Built in 16A relay for switching output device
• Uses integrated 240V->5V PSU module

• Low voltage powered PCB

• 3.3V to 5VDC input (up to 28VDC with optional DC-DC converter module)
• Pull-down FET, ideal for driving a solenoid/relay coil - eg the front door lock solenoid
• Diode to protect against back EMF from relay coil
• Able to communicate with another assembled PCB over RS485 using optional Uart-RS485 module, to allow card reader to be sited remotely