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'[PIC] Pic Tutor (Pic Micro)'
2006\01\17@073332 by Alex Rogers

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Hi again

Thanks to everyone for their help so far.  I still haven't got my programmer
working yet, though.  :-(

I believe the board that I have (picture at http://www.smartcti.com/pictutor.jpg)
may be a pre-cursor of the PicMicro (formerly PicTutor) at
http://www.epemag.com/cdptut.htm.  I seem to remember this software though I
have of course lost it.  (Does anyone have a schematic diagram of this -
version 2.1?)

It is basically a 'quick and dirty' programmer.  Only pins 2, 3 and ground
are connected from the parallel cable.  The circuit diagram (as best as I
could do) is at http://www.smartcti.com/ptdiagram.jpg. I haven't show the circuit
for the 'demo' part of the PCB because it is too complex for me to draw.  I
can check certain bits if need be.  I don't know the values of the
capacitors or resistors (they're too small). Also, I might have drawn the
zener diode the wrong way around.

I am now using a different PC (I have tried two in fact) from before and
this may be the problem.  Using WinPicProg and Fpp, I have made sure that
the signals are being sent to RB7 and RB6 on the chip (they appear at around
3.5v when high), but I am worried that either this voltage isn't high enough
or that the data is being sent too fast.  Both WinPicProg and Fpp appear to
have maximum values for 'delays'.  Also, I can't find any instructions or
help for either program with a view to how to set the timers etc.  

I have even tried really small programs but still no good.

The power supply I am using is 18v at 750ma.  MCLR registers 13.1v when
high.  Vdd registers 5.0v. when high.

I don't mind adding extra circuits to the board (within reason) but wonder
whether it would just be easier to scrap the board and start again.  This
would be a shame though as the board is very useful as a 'demonstrator'
because it has the buttons and LEDs.

Thanks in advance

Alex




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2006\01\17@194610 by Keith

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You know for $35 you can buy a pickit...
I bought one 3 weeks ago and have been using it for 3 weeks.
I have a program on it that reads a pot and outputs a PWM to run an LED.
My next step is to add fixed point math and scale the pot values

not to be crude, but what have you done in a year???

Keith

{Original Message removed}

2006\01\17@210422 by kravnus wolf

picon face
Perhaps he wants to know more about a PIC programmer.
Let him
experiment. Anyway, debugging a PIC programmer as a
FIRST
PIC project is a bad choice(Too much info. to grasp).
I do recommend PICKIT2 or ICD2 since they are READY
made and has a lot of docs. Once you are more ready
you can go back to understanding why the old PIC
programmer failed.

John

--- Keith <spam_OUTpicTakeThisOuTspamcorvettengineering.com> wrote:

{Quote hidden}

> {Original Message removed}

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