DIY-Calculator Hardware:Hardware Project

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Revision as of 13:31, 14 October 2006; view current revision
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Blockdiagram
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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 original 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
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Testing sensor pads
~3uS skew
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~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
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Bare FPGA Board
Keypad prototype
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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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