Issues with v2.0: Difference between revisions
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(Created page with "===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. The system at [http...") |
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===Open Access Control - Issues with v1.0 and v2.0 hardware=== | ===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. | First off, the v2.x hardware has been very reliable and is installed at a number of locations. The system at [http://shop.23b.org 23b Shop] has been in production for over 1 year with no issues. 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. | ||
The system at [http://shop.23b.org 23b Shop] has been in production for over 1 year with no issues. | |||
There are some quirks to this system however, especially since it was designed without ever having seen a | |||
====List of Things to Improve in v3.0 Hardware==== | ====List of Things to Improve in v3.0 Hardware==== | ||
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* Consider adding an Arduino reset switch footprint | * Consider adding an Arduino reset switch footprint | ||
* Grounded components hard to solder. Consider going to a grid for ground plane | * Grounded components hard to solder. Consider going to a grid for ground plane | ||
* Better regulator footprint or more spacing for | * Better regulator footprint or more spacing for heat sink | ||
* Need more inputs and outputs for Wiegand reader beeper, LEDs | * Need more inputs and outputs for Wiegand reader beeper, LEDs | ||
* Consider Arduino Mega support | * Consider Arduino Mega support | ||
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** Replace opto-isoloators with ESD absorbing devices. May also allow bi-directional support. | ** Replace opto-isoloators with ESD absorbing devices. May also allow bi-directional support. | ||
* Consider CPU that will handle encryption | * Consider CPU that will handle encryption | ||
Revision as of 17:41, 30 October 2011
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. The system at 23b Shop has been in production for over 1 year with no issues. 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 Things to Improve in v3.0 Hardware
- Separate power or ground for each sensor input (1 sensors = 2 screw terminals)
- Consistent labeling (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
- 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