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'PICStart 16B1 and old PC ?'
1995\05\07@204634 by Byron A Jeff

picon face
> Hello,
> two small questions:
> after hanging around here for some time and not saving most of the traffic
> to disk, I have one stupid and one less stupid question. The stupid
> question first:
> Is the PICStart 16B1 Kit a good starting point for working/playing with
> PICs ? For the time being, I'll probably focus on the '84, mainly for
> monetary reasons - the reprogrammable Versions of the other PICs are simply
> too expensive in low quantities.

It sure is a good point. But for a 16C84 you can actually do one better
and build your own programmer. Take a look on*

These files describe a 16C84 programmer developed by David Tait. Works
quite well.

Also all of the microchip programming tools are available at

BTW if this is a dumb question I'd sure like to see your smart ones ;-)

> And the probably less stupid question: will the PICStart 16B1 work on/with
> an old plain-vanilla notebook under DOS (8086-comp. V20, 2 Meg RAM,
> serial/parallel port, CGA screen) ? Speed will hopefully be not an issue.

Yes it will. Speed is not an issue. Runs off a serial port.
Currently I use mine connected to a notebook running Linux. Works fine with
the DOS emulator for Linux. That way I can do other stuff while I'm working
on my PIC development.

> And a last question :-) : is the list still alive ? It was very quiet
> during the last few days.

It sure is. It goes though it's lulls until someone posts something



1995\05\09@141457 by Chuck McManis

Markus asked:

   No problem there. Does anyone have code and hardware descriptions
   (board layout ? he asks hopefully) for a r/c electronic speed control
   based on a PIC ?

Well in the July '95 issue of Circuit Cellar Ink there is an article
(by me) on building an electronic speed control out of a 16C54. The
specs are:

       single input, bidirectional control (.8ms = full reverse, 2.1ms =
       full forward with 100 proportional steps in between. 1.4 - 1.6
       mS == brake (lower legs of the bridge shorted))

       output is four bits (high side left and right, low side left and right)
       that I use to drive an optoisolator and from there a MOSFET bridge.

The output is a 2Khz PWM waveform. (You can get 4Khz if you only want
50 forward and reverse directions)

I didn't think of adding soft-start, that might be possible (the PIC
is _really_ busy capturing the input pulse and converting it to PWM)

I've got the code in both MicroChip and Parallax mnemonics, I'll check
with CCI about releasing it prior to publication.

As for a stepper controller that would be pretty cool to but I've not
done that one.

My speed control uses port a (0 - 3) to control the bridge and one bit
of port B for input. Someone (I'm terrible with names, sorry about that)
suggested that if they would like it to simply take an 8 bit value (signed)
for speed. That could easily be done as well (actually it would free up
some cycles for other stuff like braking.)


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