Blog from August, 2015

LeonardoClockTestPrelim.7z V1.0

Despite from 2 different companies, they can share the same library since the command and registers protocol is the same.

• DS3231 has internal thermal compensated crystal which makes it more precise
   
• The https://detail.tmall.com/item.htm?id=520058075274&toSite=main Module with DS3231 also contains an AT24C32 I2C eeprom
• Important:

  • Do not buy TINY RTC module , it has design flaws

    See : http://forum.arduino.cc/index.php?topic=177297.0

    

• Server will have
  • 1 vCPU
  • 4GB vRAM
  • 100GB vHDD

• Service ip is at 158.132.58.98
• Will open port 26001 as test port, and 26002 for ftp upload.

• Network configured using 1-gigabit switch (MikroTik RB260GS), 1-gigabit router(MikroTik RB951G-2HnD RouterOS)
• Up-link port links to gigabit switch
  • gigabit switch links to
    • iproto.sd.polyu.edu.hk (158.132.58.97)
    • V611 printer(158.132.58.17)
    • gigabit router(158.132.58.98) act as:
      • service forwarding/web proxy for
        • new server (open source project confluence/jira, web server)
      • office PC and wireless AP
        • Firewall rules still to be applied to block dynamic dhcp client to access 158.132.52.* before opening up for student helper use.