Revision as of 13:42, 4 December 2008

The PIC HomeCockpit Controller (PHCC) Motherboard

Description

The PHCC motherboard is the core component of the PHCC system. It connects to the computer via serial port (RS-232) or via USB.

A PIC18F452 microcontroller is used as the "heart" of PHCC. It is responsible for communicating with the PC via a simple protocol and it scans the Analog inputs as well as the keymatrix every few milliseconds.

The motherboard houses the following subsystems:

• 35 analog inputs (3 priority, 32 normal) in form of a pinheader with 3 terminals for each analog input
• 16 connectors for 16 keymatrix daughterboards (64 inputs per board). For IDC flat ribbon cables.
• a RS-232 serial port (for Null Modem cables) with level converter (MAX232)
• a socket for USB interface board
• an I2C port
• a connector for Output daughterboards of "Type A" (DOA) using a 2x5 pinheader for IDC flat ribbon cables.
• and a connector for output daughterboards of "Type B" (DOB) using a 2x5 pinheader for IDC flat ribbon cables.

Schematic and Layout

Current revision (Rev.4B) of the motherboard (Sept 28th 2004):

Rev.4B Schematic

Rev.4B Layout

Revision 4 schematic and layout (Aug 16th 2004):

Rev.4 Schematic

Rev.4 Layout

Assembly Instructions

work in progress, pictures to accompany descriptions soon.

• text only, Rev.4: Motherboard_Rev4_assembly_tutorial.txt
• text only, Rev.4B: Motherboard_Rev4b_assembly_tutorial.txt

Download

See download page

Note about Resistors: all resitors are standard kind, ie. 1/4W, carbon film, +/-10% (Its generally a good idea to get lots of 10k and 330R resistors. the 10k are for pullups, the 330R for LEDs)

Board Errata

The Rev.4 boards as sent to the boardhouse have a tiny mistake:
The numbering of the capacitors skips C8/9.

Changes between Revisions: