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Re: PIC resources

d nixon
 

There is a ton of stuff for PICs online. There's also a PIC group on Yahoo.

-Mike



From: "Michael Carey" <mpc@...>
Reply-To: Electronics_101@...
To: <Electronics_101@...>
Subject: [Electronics_101] PIC resources
Date: Mon, 29 Oct 2001 16:51:35 +1100

How many people have experience with PIC's, I am looking to share code snippets with other people. Also if people have unique or interesting projects using PIC's I would be interested in knowing of them. I have my own PIC resource page - it generally deals with the Dick Smith PIC programmer and testbed, here is the url:

If you have a webpage on a PIC project or resources I would be interested in throwing in a link to it especially if it is a cool project or has similar value.
Cheers Michael C

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Re: books needed from india

Mounir Shita
 

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There?are tons of them. I will suggest to go to go through their selection, read the reviews by people who bought the book and find the one you want.
?
Mounir

-----Original Message-----
From: rahuljayawant@... [mailto:rahuljayawant@...]
Sent: Monday, October 29, 2001 10:06 AM
To: Electronics_101@...
Subject: [Electronics_101] books needed from india

hi i am a new member of this group.i am doing electronics and
telecommunication engg in india.i want to know are there any nice
books available for basic electronics and basic telecommunication by
which i can improve my fundamentals of electronics and
tlecommunication.



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Embedded System Design

Mounir Shita
 

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Hi everyone,
?
I can't remember who, but I think some people in here asked for good books in PICs and microcontrollers. I just found my old "microcontroller" book here in my office called "EMBEDDED SYSTEMS DESIGN" by Steve Heath. If my memory serves me right I got this book at Powell's Bookstore pretty cheap.
?
Its a very very good book that goes through everything you need to know to build your own 8 or 16 bit microprocessor or microcontroller circuit. Even talks about writing your own OS for it. A lot of examples and very easy to follow. I recommend this book to everyone who wants to learn about this subject.
?
Mounir

Mounir Shita – Hardware Engineer
Cognex Corporation In-Sight Products Group
15865 SW 74th Ave – Suite 105
Portland, OR 97224


?
books needed from india

[email protected]
 

hi i am a new member of this group.i am doing electronics and
telecommunication engg in india.i want to know are there any nice
books available for basic electronics and basic telecommunication by
which i can improve my fundamentals of electronics and
tlecommunication.
Re: lcd display

Himanshu Sharma
 

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Hey ,
?
But they come as kits..used in most of the colleges..... so all I asked was to contact any vendor and he will give him the code... and also the circuitary...I actually did? this stuff a few days ago...the code used comes burnt in the pre-loaded subroutines...
?
Regards :-),
?
--himanshu sharma

?
The place to start is with the data sheet of the LCD display device, this should provide the information as to what kind of interface is required and the format of the data sent to the device. I haven't actually worked with any LCD devices but I think there are two types. One has a built in character set with fixed positions for each, the other would be some kind of element matrix where the user can determine images or characters by implementing combinations of bits. In either case they usually require a continuous string of data since they are multiplexed, one set of bits is turned on, then the next, and the next, etc. The process is not difficult to understand but there is great diversity in interface strategies.

?
Re: Fuses--for kevin;-)

Himanshu Sharma
 

开云体育

hey ,
?
just to add...now we use polysilicon instead of the metal...:-)
?
Regards :-),
?
--himanshu sharma

----- Original Message -----
Sent: Monday, October 29, 2001 9:54 PM
Subject: Re: [Electronics_101] Re: Fuses vs. resistors

I'm new to this group so missed the CMOS topic (which I would have
enjoyed)...? CMOS transistors use metal as interconnects -? mainly
aluminum.? The latest silicon processes are beginning to use Copper as
interconnects.? This is fairly widely publicized so you may all know this.

The CMOS transistor itself is made of standard P and N type silicon? (with
various doping levels) along with Poly-Silicon for the gate and a bunch of
silicon dioxide for the gate dielectric.

Metal is still a very important issue in IC design.? See my previous
comments on electromigration...

KV.

________________________________________________
?? Kevin Vannorsdel???? IBM Arm Electronics Development
408-256-6492??? Tie 276-6492??? kv@...??? KF6YCI

Please respond to Electronics_101@...
To:???? Electronics_101@...
cc:
Subject:??????? Re: [Electronics_101] Re: Fuses vs. resistors



heros,

> or that the length of a wire has nothing to do with resistence
>?? - mark
>
> > But I do find it surprising that one who likes to get things stated
> correctly does not want a wire to be called a resistor!!

Since these quotes are all mixed up and shortened I don't know who said
what
and for certain what he said. Here's my parting shot on the fuze,
resistor,
etc. topic.
I was wrong when I originally said that a fuze has no resistance, and of
course the resistance is required for it to fuze, i.e. blow, when it's
rated
current passes through it.? That something has resistance doesn't make it
a
resistor. If it did we'd have to call everything that is not an insulator
a
resistors, transformers, wires, fuzes, etc. A resistor is not simply a
device
that has resistance but one in which resistance is utilized as part of the
circuit design, to achieve a voltage drop when connected in series, to
bypass
current in a device when in parallel, i.e. shunt like the old D'Arsonval
(SP?) analog meters when used to measure current. Someone earlier said
that
CMOS devices actually no longer use Metal, I don't know whether that is
so,
but we don't stop calling them CMOS, which may be why I didn't know that
metal is no longer used in their manufacture.

Anyway, that's my swan song on the issue.

Jim



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Re: Fuses vs. resistors

Jim Purcell
 

Kevin,

Yep- you are right... I should have said MOS transistor. It is a
CMOS process.
I wonder where the 'other guy' got the idea that metal is no longer used in
MOS devices.

Jim
Re: Light Activated Alarm

Himanshu Sharma
 

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Hey ,
?
put a 555 circuit in front of it in monostable mode that will give a desired time for the switch to be on.... or if you want it to be continuous then use it in bistable mode...(reffer the data-sheets..)
?
Regards :-),
?
--himanshu sharma

----- Original Message -----
Sent: Tuesday, October 30, 2001 12:39 AM
Subject: RE: [Electronics_101] Light Activated Alarm

Jim,
?
Thank you for your response. It seems that the photo transistor is conducting enough to send minimal current through the relay but not enough to activate the switch, so to speak. My problem is that I need the circuit to be such that the alarm continues, even if light is removed from the photo transistor. Could you tell me more about "putting the alarm device in series with the collector and VCC. Again, I appreciate your help.
?
Sincerely,
?
Kenyon Jones
?
-----Original Message-----
From: Jim Purcell [mailto:jpurcell@...]
Sent: Friday, October 26, 2001 5:16 PM
To: Electronics_101@...
Subject: Re: [Electronics_101] Light Activated Alarm

Mounir,
However, if you have the phototransistor turning on/off a relay. And you have a piezo on the other side of the realy, the this resitance shoulder matter. Cause the relay can only be on or off, nothing in between.
Yes, but it the photo transistor is not conducting enough to operate the relay or it's on the raged edge of conduction it might not work as well as it should. I would try dumping the relay and putting the alarm device in series with the collector and Vcc.

Jim

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Re: newbie inquiry

Jim Purcell
 

av1a,
Please tell me that 12VDC ~ 2Amps ~ 230 Watts (PC power Supply) don't kill , as i've tried it.

You mean you are writing from 'the other side', i.e. you are dead?? What can shock you depends on many factors. Most people can stand voltages up to 60 or 70 volts. The amound you can stand depends on your body resistance. I can probably stand a bit more because I'm an old fart with dry skin. I can't make anything of your line above, the 12 V ~ 2 amps. part wouldn't shock anyone and the current the person would draw depends on is skin resitance, no matter how much current the ps can deliver. That is only a maximum.? I don't know what the next thing is about, will 230 volts should you? Most probably, Kill you? Depends on whether you were able to let go. Also is this DC or AC. If AC is it 50/60 Hz. or RF.? RF travels along the surface of the conductor and peole can withstand voltages capable of producing giant arcs. Nichola Tesla use his Tesla Coil to counter Tom Edisons charge that AS was too dangerous to use for distribution of electrical power, proving that even geniouses can be short sighted when their own commercial interestes are being challenged. It probably also demonstrates that Edison was more likely a persistance tinkerer than a techno genious, that and a good manager of his 'assistants' efforts.
?Does anyone have a chart that tells me when to touch & when to wear rubber gloves

If in doubt use the gloves. :-).? If the voltage is less than 100 you can probably get by without the gloves. If you avoid completing any circuits it is also possible in some cases to avoid shocks. Sometimes equipment must be operated with the dangerous components exposed, always assume that such devices can bite you. Avoid touching them with both hands. The dangerous path is across your heart. The general rule is, turn it off, but if you can't keep one hand behind you.

Jim
Re: all my freinds

Himanshu Sharma
 

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hey ,
?
No offence.!!
what i say is that hackers are not bad and niether they are evil...those who use these cheats for abuse are bad....we learn and try it out but always keep that in my mind that it should not hurt anyone....And for the hacking...I difine it as a way to do the same thing in?a different way....Happy learning...
?
Sorry if I said BAD/Objectionable to anyone...!!:-)
?
Regards :-),
?
--himanshu sharma


I think what he is asking is more along the lines of preventing hacking - understanding how hacking works so that one can safeguard their systems from such things.
?
Who said that it [hacking] is a bad work

The people who get hacked say so. Burglers might try to justify what they do, their victims know better.

...and by the way breaking into computers is not the only hacking... we have phone-phreaking...

All are as morally wrong as what the burgler does.

even overclocking...

I assume you are talking about the more legitimate kind of hacking, trying to learn about and optimise computer software and hardware.

so please mind what you say...and most importantly it requires skill...

So does burglary, but that does not make it right. As for 'minding what he says' any conversations about preventing crime are perfectly valid. Conversations about preventing crime are the ones that are suspect.
?

Jim
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Re: Fuses vs. resistors

Kevin Vannorsdel
 

Yep- you are right... I should have said MOS transistor. It is a
CMOS process.

________________________________________________
Kevin Vannorsdel IBM Arm Electronics Development
408-256-6492 Tie 276-6492 kv@... KF6YCI

Please respond to Electronics_101@...
To: Electronics_101@...
cc:
Subject: Re: [Electronics_101] Re: Fuses vs. resistors



Kevin,

The CMOS transistor itself is made of standard P and N type silicon
(with
various doping levels) along with Poly-Silicon for the gate and a bunch
of
silicon dioxide for the gate dielectric.

Metal is still a very important issue in IC design. See my previous
comments on electromigration...
Are we talking about IC's or transistors. I have never heard of a CMOS
transistor, since the very idea of the C part is the coupling of two MOS
transistor of opposite polarity. I have not kept abreast of the bleeding
edge of solid state development, but either someone is confused or I
am even further behind than I thought.

Jim



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Re: Digest Number 134

Himanshu Sharma
 

开云体育

Hey ,
?
may be I disagree with this that the charge is not stored?at?the plates...
?
The capacitance depends on the dielectrics because that determines the field that the two plates can have between them...
?
And I cann't figure out if the charge was staored in the dielectrics then vaccum will have no charges..???
?
what I say is that charges are stored at the metal plates...this is what we use to derive the relations in CMOS transistors...!!
?
?Regards :-),
?
--himanshu sharma


Sorry, but the charge is stored in the dielectric. That's why the amount of
capacitance depends in part on the kind of dielectric. A conductor will not
store a charge, only provide a path for it. Insulators respond to the potential
difference and the atoms get distorted in the sense that some lose or gain
electrons. Any imbalance in the atoms of a conductor equalizes when the current
stops, not so with insulators. The fact that I can't see how a vacuum stores a
charge doesn't alter the fact that it is the dielectric that stores the charge.

Jim



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Re: Fuses vs. resistors

Jim Purcell
 

Kevin,

The CMOS transistor itself is made of standard P and N type silicon (with
various doping levels) along with Poly-Silicon for the gate and a bunch of
silicon dioxide for the gate dielectric.

Metal is still a very important issue in IC design. See my previous
comments on electromigration...
Are we talking about IC's or transistors. I have never heard of a CMOS
transistor, since the very idea of the C part is the coupling of two MOS
transistor of opposite polarity. I have not kept abreast of the bleeding
edge of solid state development, but either someone is confused or I
am even further behind than I thought.

Jim
Re: Fuses 60 volts???

Jim Purcell
 

Kevin,

Ever here of a fuse with 60 volts ACROSS it? Come on... power is the
only thing that generates heat... this is either I^2 R or V^2 / R or
I*E... you can't get any of these to equal something without a
resistance... period.
You're behind the times, no one is disputing that now that I know of.

Jim
Re: Light Activated Alarm

Jim Purcell
 

Kenyon,
Thank you for your response. It seems that the photo transistor is conducting enough to send minimal current through the relay but not enough to activate the switch, so to speak.

In this case you will probably require a second transistor, connect the phot transistor with the collector at Vcc and the emitter on the base of the second transistor. This way the first tranny provides bias to the second. Put the relay in series with the second transistors collector and Vcc.
The emitter can go to ground, i.e. p.s. comnon. These would both be NPN transistors else you can turn the power supply upside down, i.e. pos. grounded etc.

My problem is that I need the circuit to be such that the alarm continues, even if light is removed from the photo transistor.

This will require a latching device. If you are using a ralay instead of a solid state device you can use an auxilliary set of contacts to hold the relay in after the lighe 'goes away'. Or you could possibly use an SCR (silocon control rectifier) in place of the second transistor, these devices stay on once triggered.

Could you tell me more about "putting the alarm device in series with the collector and VCC.

This is pretty strait foreward.? Connect one end of the relay to Vcc (p.s. +)
and the other end of the relay to the transistor collector. The emitter goes to ground, or p.s. common.? The base of a photo transistor goes to light, i.e. the light turns on the transistor.? Or if this is the second transistor it would be connected to the emitter of the first one.? What I have described here is a very simplified description. More specifics would depend on the nature of the devices used, etc.

Jim
Re: Capator tester

Jim Purcell
 

Michael,
Could anybody point me in the right direction to design a capacitor tester.

I assume you mean an instrument that will measure the capacitance as well as
test whether the capacitor is good. Many years ago I built an Eico kit capacitance
bridge. It use the principle of a wheatstone brige to measure capacitnace. Of
course it was the AC version of the bridge and the user manually ajusted the
bridge for a balance and read the capacitance according to where the pointer
pointed. That kind of instrument used the principle of capacitive reactance.
I think one side of the bridge consisted of one known and the unknown
capacitance and the other a fixed and a variable resistance. I confess
that Ihave not read any description of how the modern solid state
instruments work but I guess they are just automated implementations
of the old bridge circuits. In any they most likely depend on passing
AC through the capacitor and determining capacitance accoring to
a voltage drop across a component.


Jim

Re: Fw: communication concepts ??

Jim Purcell
 

angtengchat,
Talking about force, I wonder if a rocket could fly across a vacumn, which does not have anything at all.

They already have, to the moon, mars and beyond. And yes, as far as we know space is a vacuum.

I just wonder how could force produce motion if there's no friction for it to force a motion.

Unlike propellers or jet planes, rockets provide their own 'force', when the propellent is pushed out of the tail the equal and opposite force propells the rocket in the opposite direction, at least as long as the
fuel lasts.? As an aside, popular si fi shows like Star Trek do a disservice to peoples understanding of science vis a vis motion
through space. First off, most of the time the rockets are turned
off. And if you continue to expell the rocket gases the speed of
the object, i.e. ship, would continue to increase. AND the fuel
would be expended very soon. Second, they often talk about a
ship being 'dead in the water' after the engines stop. Unless
they fire engines in the opposite direction the ship will merely
continue in the last direction it was traveling. There are more
but one of the worst, is when we see external shots of the
ships and hear their sound. Since space is a vacuum the sound
could not be heard, even if the viewer were out there unprotected
by a ship. Of course I know that drama often dictates that
science take a back seat. Those cannons in Star Wars are far
more dramatic when they recoil like WW II cannon.

Jim

Re: tv to vga

[email protected]
 

开云体育

Hmm , ....this would be interesting
?
have you tried ? video section.
?
imran

-----Original Message-----
From: ejazabidi@... [mailto:ejazabidi@...]
Sent: Monday, October 29, 2001 7:59 AM
To: Electronics_101@...
Subject: [Electronics_101] Re: tv to vga

--- In Electronics_101@y..., "yahoo" wrote:
>
> >i need a circuit which convert my monitor into tv receiver.
> >i will be very thankfull.
>
>
> Do you want your VGA monitor receive RF television signals (like
channels 2-13) or just make a circut to convert NTSC video to VGA?

helo
yes i want my vga monitor receive rf tv signals. will u help me to
find a circuit for that?
thanx



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Re: lcd display

Jim Purcell
 

Himanshu,
Well for that I don't think that you will get the code in C but instead what you can do is contact any 8086 kit vendor and ask him for the Assembly code..he will surely help you with all the interfacing architectures...
The place to start is with the data sheet of the LCD display device, this should provide the information as to what kind of interface is required and the format of the data sent to the device. I haven't actually worked with any LCD devices but I think there are two types. One has a built in character set with fixed positions for each, the other would be some kind of element matrix where the user can determine images or characters by implementing combinations of bits. In either case they usually require a continuous string of data since they are multiplexed, one set of bits is turned on, then the next, and the next, etc. The process is not difficult to understand but there is great diversity in interface strategies.

Jim

Re: Automation

[email protected]
 

开云体育

This site has some great projects like Stepper controls project for CNC machine
?
?(need french translator to read)
?
also some PIC programmer PCB schematic ..
?
I'm looking for any of the automation projects (& Fanuc Manuals ;-)
?
imran

?-----Original Message-----

From: iman hermansyah [mailto:iman_hermansyah@...]
Sent: Monday, October 29, 2001 4:36 AM
To: Electronics_101@...
Subject: Re: [Electronics_101] Automation

Hi Iask,

I'm interesting in Automation too especially in
industrial intsrumentation and Automation,i work for
one of oil company at Instrument division.

iman

--- iasknoone@... wrote:
> I work as a Technical Support Engineer in Automation
> Division of a
> Turkish Company, Ozdisan Electronics....I would like
> to discuss about
> any kind of Automation and Electronics.
>
> If you have any special projects about Automation we
> may share it.
>
>
>
>


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