DIY-Calculator Hardware:Hardware Project

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-New LCD module tested and integrated. The original planned 20x1 LCD module is hard to get, so we evaluated additionally 20x2 types (this mainly has impact on the mechanical hardware design).+New LCD module tested and integrated. The originally planned 20x1 LCD module is hard to get, so we evaluated additionally 20x2 types (this mainly has impact on the mechanical hardware design).
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Revision as of 13:48, 14 October 2006

Blockdiagram
Enlarge
Blockdiagram

The layout will somewhat resemble the layout of the (virtual) DIY Calculator with an 20x1 character LC display and a 70 keys sensor key matrix. Additionally there are connectivity means for a host PC:

  • Serial (RS-232) for uploading user programs and providing a console to the DIY Calculator CPU
  • A JTAG programming connector; this connects to the PC's parallel port and enables the user to load new designs into the FPGA
  • Additionally there will be sockets for external ROM/RAM chips and a large prototyping area for free use.


Project status (9.Oct.2006):

New LCD module tested and integrated. The originally planned 20x1 LCD module is hard to get, so we evaluated additionally 20x2 types (this mainly has impact on the mechanical hardware design).

Project status (31.Aug.2006):

Testing sensor pads
Enlarge
Testing sensor pads
~3uS skew
Enlarge
~3uS skew


Test of sensor keypad was successful. Here are the photos

Project status (13.Aug.2006):

Prototype PCB layout completed. Here are the "final" schematics:

keypad mechanics:

and the layout:

Bare FPGA Board
Enlarge
Bare FPGA Board
Keypad prototype
Enlarge
Keypad prototype


Test of sensor keypad is in progress.

Project status (7.Aug.2006):

We decided to separate the functionality into two PCBs: the FPGA with surrounding components and the sensor keypad. This gives even more flexibility for different I/O modules. Here are the updated schematics:

Project status (19.Jul.2006):

schematics completed, PCB layout work started

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