Alt-BEAM Archive
Message #02615
To: beam@corp.sgi.com
From: "Jakub Pietracha" whraven@free.com.pl
Date: Sat, 24 Apr 1999 22:45:23 +0200
Subject: [alt-beam] PNC problems.
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content-type: text/plain;
Few days ago I wrote an e-mail about my PNC problems. I got only one leter =
but nothing constructive. The author of the leter treated me like complete =
ignorant who doesent know anything about electronics. And this is suppose t=
o be an educational mailing list! ANYONE who can help me please reply. I ma=
naged to go around the problem and designed my own PNC solution but I stel =
whant to know what was wrong with the previous circuit. Heres a copy of my =
previous e-mail:
---------------------------------------------------------------------------=
-----------------------------------------------
To all of you around the world. Help !!!
=
I am a beginer in BEAM. I've just built my thirst BEAM bot - a two motor wa=
lker driven by a microcore of four neurons. And as you might expected I hav=
e a problem with it. The microcore worked for the thirst time and the walke=
r walked perfectly but when I conected the PNC my problems begun. I've buil=
t my PNC this whay:
=
gnd
|
||
|| 2,2M ohm resistor
| signal diode
------inverter----|>|------ PIN 1
|
=3D 2,2 uF electro capacitor
|
vcc
=
It did something like this: at power up when the output of the PNC was high=
two pulses were runing around the net and when it turned low two neurons s=
tayed high. When I changed the polarisation of the diode at power up two ne=
urons stayed high until the output turned low and then two pulses started r=
uning around the microcore.
=
I've tryted everything: duble checked all components, used new ones, I've c=
hecked all the conections, replaced the IC (74HC14), played with polarisati=
on of the diode and capacitor, tyed conecting C to gnd and R to vcc (in thi=
s configuration at power up the output was low and then turned high), remov=
ed all of the flux from the PCB but nothing helped. I've also tryed all typ=
es of diodes that I hapened to have in my part box but they all had the sam=
e efect. The timing is also not the problem I've used capacitors up to 100u=
F and resistors up to 5 M ohms. I just dont have any clue what could go wro=
ng. I am rother advanced in electonics but it is the thirst time I am whour=
king with a microcore and I am realy confused.
=
Afthur some time I've built completly new microcore and PNC from new compon=
ents and a new PCB and even that didnt helped. Can anyone tel me what's wro=
ng with it? <:o)
=
Afthur some time I got fed up with that PNC design and decided to find my o=
wn solution:
=
vcc
|--------------------------------
=3D 2,2uF electro |
| |<---
-----inverter-----------| PNP transistor
| |----------------------------ex. pin 1
||
|| 2,2 M ohm =
|
gnd
=
It whourks but I steel dont know why I had the problems with the previous c=
ircuit.
=
Jakub Pietracha
whraven@free.com.pl
=
Ps.
Please excuse my english it is not my native lenguage and I dont use it as =
often as I would like to. Sory for all the mistakes.
=
------------------------------------------------------------------------
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content-type: text/html;
I am a beginer in BEAM. I've just built=
my =
thirst BEAM bot - a two motor walker driven by a microcore of four neurons.=
And =
as you might expected I have a problem with it. The microcore worked for th=
e =
thirst time and the walker walked perfectly but when I conected the PNC my =
problems begun. I've built my PNC this whay:
gnd
|
||
|| 2,2M ohm resistor
size=3D2>| =
; =
signal diode
------inverter----|>|------ PIN 1
|
=3D 2,2 uF electro capacitor
|
vcc
It did something like this: at power up=
when the =
output of the PNC was high two pulses were runing around the net and when i=
t =
turned low two neurons stayed high. When I changed the polarisation of the =
diode =
at power up two neurons stayed high until the output turned low and then tw=
o =
pulses started runing around the microcore.
I've tryted everything: duble checked a=
ll =
components, used new ones, I've checked all the conections, replaced the IC=
=
(74HC14), played with polarisation of the diode and capacitor, tyed conecti=
ng C =
to gnd and R to vcc (in this configuration at power up the output was low a=
nd =
then turned high), removed all of the flux from the PCB but nothing helped.=
I've =
also tryed all types of diodes that =
I hapened to have in my part box but =
they all =
had the same efect. The timing is also not the problem I've used capacitors=
up =
to 100uF and resistors up to 5 M ohms. I just dont have any clue what could=
go =
wrong. I am rother advanced in electonics but it is the thirst time I am =
whourking with a microcore and I am realy confused.
Afthur some time I've built completly new microcore and=
PNC =
from new components and a new PCB and even that didnt helped. Can anyone te=
l me =
what's wrong with it? <:o)
Afthur some time I got fed up with that PNC design and =
decided to find my own solution:
vcc
|--------------------------------
=3D 2,2uF =
electro |
>
size=3D2>| =
; &n=
bsp; =
|<---
-----inverter-----------| PNP =
transistor
size=3D2>| =
; &n=
bsp; =
|----------------------------ex. pin 1
||
|| 2,2 M ohm
|
gnd
It whourks but I steel dont know why I =
had the =
problems with the previous c
ONT =
color=3D#000000 size=3D2>ircuit.
Jakub Pietracha
Ps.
Please excuse my english it is not my native lenguage a=
nd I =
dont use it as often as I would like to. Sory for all the mistakes.<=
/DIV>
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