Dryden Engineering

Dryden Engineering provides printed circuit design and layout of multi layer printed circuit boards. We also provide engineering services for circuit designs for customer applications.


Company Information.

  • President Glenn Gram.
  • Location Ann Arbor Michigan area.


    Contact Information.

  • Email Address: glenngram@drydeneng.com
  • Web Address: www.drydeneng.com
  • Office Phone number: (734)944-5105.


    Background Information on Dryden Engineering

    Dryden Engineering opened its doors for business in June of 2001.  Glenn Gram is the lead designer and has 5 years of experience in designing multilayer circuit boards. Glenn also has 15 years experience of circuit design


    Current Projects

  • Design and Layout of a power supply and network interface for a local school.
  • Silkscreen and layout for a local PCB supply house.
  • Design and layout of a PIC based home control system.
  • Design of a home Thermostat.


    Home Thermostat and it features.

  • 4 x 20 Line LCD Dispaly with LED Backlight.
  • Microchip PIC 16F877 CPU.
  • 4 AAA Batteries to keep time while main power is out.
  • EEPROM to keep user setup while power is out.
  • 4 Daily offsets to change the set temp. Heat and Cool.
  • Pre and Post fan turn on and off times.
  • 1 RS 232 port and 1 RS485 port for connection to a PC.
  • Heat relay and LED.
  • Cool relay and LED.
  • Fan relay and LED.
  • Aux relay and LED.
  • Battery low indication.
  • Furnace Filter change notice.
  • Software to run on a PC to monitor and log and setup the Thermostat.


    Bare Thermostat board with out the LCD.


    Prototype Thermostat board.


    Installed in a home the finished Thermostat.


    Windows software to setup and control the Thermostat.


    Wall Unit for home monitoring and control .

  • Microchip PIC 16F877 CPU.
  • 1 9 volt Batteries to keep time and setup while main power is out.
  • EEPROM to keep user setup while power is out.
  • 1 RS 232 port and 1 RS485 port for connection to a PC.
  • Battery low indication.
  • 4 Temp sensing channels.
  • 8 Channels for either digital inputs or digital outputs.
  • Light level sensor.
  • 3 relays to turn on and off high voltage or high current sources.
  • 4 optically isolated inputs.
  • 94db Alarm.
  • Power over RS485 port.
  • Software to run on a PC to monitor and log and setup the Wall Unit.



  • Pictures of the balloon flights.

    Last Revised: 6/21/2011