Issues with v2.0

Open Access Control - Issues with v1.0 and v2.0 hardware

First off, the v2.x hardware has been very reliable and is installed at a number of locations. There are some quirks to this system however, especially since it was designed without ever having seen a commercial unit. Here are some things we would like to improve.

List of Limitations in the 2.x Hardware

• No Separate power or ground for each sensor input (1 sensors = 2 screw terminals)
• More consistent labeling desirable(some items start with 0, others with 1)
• Screw terminals obscure labels of pinouts.
• Standardize Wiegand and other pin layout and order
• Removable screw terminals (3.5 or 5mm) desirable for servicing
• Need to label NO, C, O for relay terminals
• Increased separation of trace spacing near relays
• Double ground planes need stitch vias for better immunity
• Eliminate ground plane around external relay traces
• Readers with <100uS pulses require external capacitors to work
• Break out ICSP pins from Arduino
• Consider adding an Arduino reset switch footprint
• Grounded components hard to solder. Consider going to a grid for ground plane
• Better regulator footprint or more spacing for heat sink
• Need more inputs and outputs for Wiegand reader beeper, LEDs
• Consider Arduino Mega support
• Look at RTC crystal and pick best temperature-compensation range
  • Maxim Crystal Selection Notes
• Think about on-board Ethernet
• Option for RS-485
• Option for SD card for local logging. Consider file system.
• Control costs (SMT design, cheaper components in some areas
  • Switching PSU circuit
  • Replace opto-isoloators with ESD absorbing devices. May also allow bi-directional support.
• Consider CPU that will handle encryption

Software Improvements

• Allow for server time syncing
• Re-number user database starting with 1 instead of 0
• Rewrite interrupt code to not need wrapper function
• Make interactive user editing more friendly
  • Need to save unedited fields
• Allow for SD card logging
• Consider SD card storage for user database
• Allow for connection to SQL database