Solid State Timer help (NAC)

[Richard J Lebens]

I am not volunteering but…   How much electronics expertise do you
have?    Since you posted this you must have a computer with a COM port
and some experience.  I have been playing with a new line of parts
trying to talk on an automotive J1850 bus.

Motorola is marketing a line of micro-controllers named NITRON (
mc68hc908QT4 ).  They come in 8 pin or 16 pin packages.  They contain
an internal oscillator, reset circuit, 4k of flash memory 128 bytes of
RAM, a Timer Interface Module, I/O port and an 8 bit A/D (if you wanted
some feedback on motor current or pressure for example).  This would be
ideal for your app.

In single part quantities they cost about a dollar.  Motorola is very
actively marketing this line.  They have a demo kit that contains an
etched PC board 9 pin cable and Metrowerks development system software
for $25.  It used to be free and if you are in the business or know a
distributor I bet you could talk him out of one.  I think it is
MC908DEMOqt4.  With this you can program and debug (ICE) the part with
no additional hardware through the com port on your PC.  Like I say I
have been playing and it took a couple hours to figure out Metroworks
Code Warrior software but it is pretty cool.

Sorry no quick and cheap solution but good luck.  Be careful and do a
failure modes and effects analysis.

--- ScottyCBoy at aol.com wrote:
> --
> [ Picked text/plain from multipart/alternative ]
> Sorry for the lack of Audi content but I'm in need of some
> electronics
> expertise. I need to construct a solid state dual timer module for
> the high
> pressure scuba and paintball compressors that I am rebuilding and
> manufacturing. I can purchase a series of time delay relays but they
> are
> extremely expensive. I need two simple timer circuits, on that will
> control
> the bleed valve (30 minutes on 2 minutes off 30 on 2 off...)  and a
> circuit
> that controls the motor, it will run for two minutes when the
> compressor
> switch or pressure switch is shut off. In payment I can offer used
> Audi
> parts,beer, or scuba and paintball accessories...
>
> Thanks in Advance,
> Scott
>


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