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'Firmware Scheduling'
1998\07\29@143648 by John Bellini

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I am trying to schedule a project that is in the planning phase now.
The project consists of a power supply and the beginnings of a
communications system which will interconnect all of our future products
with a centralized Control Panel.  The power supply consists of two
16C74 type processor utilizing most of the resources (A/D, UART, SPI /
I2C, timers, interrupts, external EERPOM and memory) on both chips.  The
two processors communicate with each other and only one of them talks to
the outside world.

Everything is done is real time with long and short reaction times
required.  As well as synchronization and waveform generation.  As you
can see, we will be fully utilizing these devices.

Any ideas on estimating a time for a project of this size (good
documentation, firmware development, design and implementation), please?


John Bellini

1998\07\29@172409 by Chris Eddy

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Um, just a wild stab (it's not that bad, as a consultant I cannot afford to
be too far off).

Design of the full concept and author a functional spec, 30 hours.

Design all of the schematic and PCB designs, 40 hours (any packaging extra).

Write the software AND get it to work very well, 200 to 220 hours.
This last item is the toughest.  Do you have a library of code and
experience to fall back on?  If you do, it may come together faster.  I
might manage to get it to work in 140 or so.  The novice will tripple that
time and still find bugs in the final product.  I would insist on 8 weeks of
non-interrupted design time, no intrusions to run up to accounting to fix
some broken PC's.

Just one man's opinion.
Chris Eddy, PE
Pioneer Microsystems, Inc.

John Bellini wrote:

{Quote hidden}

1998\07\29@175514 by Mike Wallace

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In a message dated 7/29/98 2:37:29 PM Eastern Daylight Time,
spam_OUTJBelliniTakeThisOuTspamSTATPOWER.COM writes:

<< I am trying to schedule a project that is in the planning phase now.
The project consists of a power supply and the beginnings of a
communications system which will interconnect all of our future products
with a centralized Control Panel.  The power supply consists of two
16C74 type processor utilizing most of the resources (A/D, UART, SPI /
I2C, timers, interrupts, external EERPOM and memory) on both chips.  The
two processors communicate with each other and only one of them talks to
the outside world.

Everything is done is real time with long and short reaction times
required.  As well as synchronization and waveform generation.  As you
can see, we will be fully utilizing these devices.

Any ideas on estimating a time for a project of this size (good
documentation, firmware development, design and implementation), please?
 >>

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Well, it depends on whether or not you do the project in house or a consultant
does it for you.  Most consultants will quote you 6 weeks (or whatever you
want to hear) and deliver in 12 months.  If you do the project in house I
would estimate 6 months to complete + 1 months for FCC + 3 months for
manufacturing time for a ready for market product.  If UL is required you will
have to add time for that as well.  If you want CE it may take you longer than
FCC.

Mike Wallace
////////////////////////////////////////////////////////////////


'Firmware Scheduling'
1998\08\02@204628 by Larry G. Nelson Sr.
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Without more detailed specifications I would say probably 3 to 4 man
months. This assumes all the correct tools are available and specs don't
change every other day.


At 11:33 AM 7/29/98 -0700, you wrote:
{Quote hidden}

Larry G. Nelson Sr.
.....L.NelsonKILLspamspam@spam@ieee.org
http://www.ultranet.com/~nr

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