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newbie.. need help.. plz!! ::)

 
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HDD
Semi Newbie


Joined: 20 Jul 2006
Posts: 6

PostPosted: Thu Jul 20, 2006 3:35 am    Post subject: newbie.. need help.. plz!! ::) Reply with quote

Hi, first I want to say is that this forums looks nice and is visited by many smart folks... Smile

Now... Im totally new to electronics... im good with computers... and I fiddle with electronics all the time.. but I want to build a simple thing.. and was wondering if someone could give me some guidence... Smile

The Project: Keypad, when number pressed to be stored in non-voletile memory (in case battery dies..) with time (and date if possible...) and be able to get the information in regular text to computer from that memory at later time...

If someone could tell me what i need... I have keypad... but what else is needed and how to wire from each number to what.. and how to connect to computer to be able to read the memory.... any help GREATLY appreciated...

Thanks!!
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Alan
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Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Thu Jul 20, 2006 6:37 pm    Post subject: Re: newbie.. need help.. plz!! ::) Reply with quote

HDD wrote:
Hi, first I want to say is that this forums looks nice and is visited by many smart folks... Smile

Now... Im totally new to electronics... im good with computers... and I fiddle with electronics all the time.. but I want to build a simple thing.. and was wondering if someone could give me some guidence... Smile

The Project: Keypad, when number pressed to be stored in non-voletile memory (in case battery dies..) with time (and date if possible...) and be able to get the information in regular text to computer from that memory at later time...

If someone could tell me what i need... I have keypad... but what else is needed and how to wire from each number to what.. and how to connect to computer to be able to read the memory.... any help GREATLY appreciated...

Thanks!!


Hi HDD,

Welcome to the forum, first thing I would recommend is starting with something a bit easier to get your feet wet. Starting a project that big right off the hop may be a bit large and could be shelved when a few roadblocks turn up. There is quite a bit more involved than simply hooking up a few wires for what you need.

If you want to continue with this project as your first what you will need is a microcontroller, programmer, programming language, some various hardware depending on how complex you want to make it.

There is no wrong way to start. Have a look at the keypad you have and see how you can interface to it. Most keypads are matrixed so that you don't need one connection per button. Have a look at this project by Bob Blick http://www.bobblick.com/techref/projects/lcdterm/lcdterm.html
It is a bit old, if you were to do this today the PIC that would be used would be a 16F628A but have a look and see how it was designed.

Good luck Smile
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PostPosted: Fri Jul 21, 2006 12:21 am    Post subject: Reply with quote

awsome.. thanks for the reply.. that looks like good reading... Smile

Btw here is some stuff I found that does what I would need almost.. how can I modify it for myself ... as in.. connect the keypad direct and have it log with time stamp as the other commercial logger does...
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Alan
Site Admin


Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Fri Jul 21, 2006 12:29 am    Post subject: Reply with quote

Anonymous wrote:
awsome.. thanks for the reply.. that looks like good reading... Smile

Btw here is some stuff I found that does what I would need almost.. how can I modify it for myself ... as in.. connect the keypad direct and have it log with time stamp as the other commercial logger does...


Just write the info to the eeprom memory when an event happens. If the device you are using does not have enought internal memory external memory is easy to use. Look up one wire eeproms.

http://www.google.com/search?hl=en&lr=&q=one+wire+eeproms&btnG=Search

That should get you started. Cool
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HDD
Semi Newbie


Joined: 20 Jul 2006
Posts: 6

PostPosted: Fri Jul 21, 2006 8:38 am    Post subject: Reply with quote

thnx for the reply Alan....


I decided to go simpler way... I will have a PS2 logger... so all I need to make is a custom matrix numeric keypad (only keys 0...9) with a connection to PS2 port... and it must act a real PC k/b... so I understand I will need a AMR? or what... what will be everything that I need.. and how to do it?
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Alan
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Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Fri Jul 21, 2006 5:04 pm    Post subject: Reply with quote

HDD wrote:
thnx for the reply Alan....


I decided to go simpler way... I will have a PS2 logger... so all I need to make is a custom matrix numeric keypad (only keys 0...9) with a connection to PS2 port... and it must act a real PC k/b... so I understand I will need a AMR? or what... what will be everything that I need.. and how to do it?



Hi HDD,

am not familiar with the AMR. What is that? You could definitely do it that way. Here is some PS2 protocol information you will need:
http://www.networktechinc.com/ps2-prots.html
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HDD
Semi Newbie


Joined: 20 Jul 2006
Posts: 6

PostPosted: Fri Jul 21, 2006 7:48 pm    Post subject: Reply with quote

Does a k/b need to initialized or something when its plugged in? This is what I have...


+5V Power (http://www.audiotstation.com/forum/showthread.php?s=&threadid=25715&highlight=usb+battery)

----> +5V connected to PIN4 / GRND connected to PIN3 of male PS2 (http://www.networktechinc.com/ps2-prots.html) connector... then PS2 hardware key logger connected (http://www.keelog.com/diy.html) ... then keyboard.... but pressing any buttons doesnt work... how do i know its getting power and actually turning on? Shouldt it work in theory....?


Im trying to make the keylogger store data without a computer... so that i can retrieve it later... almost like a notepad... cept im walking around with a keyboard and no computer a batter at the end and a keylogger between the battery and the keyboard...


Anyways... if someone could shed some light on how I can provide power to the keyboard and the logger WITHOUT having a computer.. would be great...

Thanks!
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Alan
Site Admin


Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Fri Jul 21, 2006 7:53 pm    Post subject: Reply with quote

HDD wrote:
Does a k/b need to initialized or something when its plugged in? This is what I have...


+5V Power (http://www.audiotstation.com/forum/showthread.php?s=&threadid=25715&highlight=usb+battery)

----> +5V connected to PIN4 / GRND connected to PIN3 of male PS2 (http://www.networktechinc.com/ps2-prots.html) connector... then PS2 hardware key logger connected (http://www.keelog.com/diy.html) ... then keyboard.... but pressing any buttons doesnt work... how do i know its getting power and actually turning on? Shouldt it work in theory....?


Im trying to make the keylogger store data without a computer... so that i can retrieve it later... almost like a notepad... cept im walking around with a keyboard and no computer a batter at the end and a keylogger between the battery and the keyboard...


Anyways... if someone could shed some light on how I can provide power to the keyboard and the logger WITHOUT having a computer.. would be great...

Thanks!



What are the specs on the keypad you have?
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HDD
Semi Newbie


Joined: 20 Jul 2006
Posts: 6

PostPosted: Fri Jul 21, 2006 8:24 pm    Post subject: Reply with quote

its just a regular PS2 Numeric keypad....

like the first one on this site.... also reading some more... I guess I do have to initialize it somehow... so I need to build a power supply with something that initializes the k/b and accepts the input and talks back to thank for the input? ( http://www.computer-engineering.org/ )


Numeric Keypads:

http://www.keyovation.com/c-14-numeric-keypads.aspx
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jack
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PostPosted: Fri Aug 11, 2006 1:36 pm    Post subject: Reply with quote

Interesting... does the logger/KB have to be initialized by a computer? I thought the power/ground would feed the keyboard, and the KB's microcontroller would simply output the clock/data signals. However, these signals are open collectors, however I BELIEVE the the pull up resistor circuit is within the keyboard... not sure.

SO to answer your question if a keyboard connected to a logger with power/ground would suffice in a logging session... im not sure.. but someone here should know
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jack
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PostPosted: Fri Aug 11, 2006 1:37 pm    Post subject: bump Reply with quote

Interesting... does the logger/KB have to be initialized by a computer? I thought the power/ground would feed the keyboard, and the KB's microcontroller would simply output the clock/data signals. However, these signals are open collectors, however I BELIEVE the the pull up resistor circuit is within the keyboard... not sure.

SO to answer your question if a keyboard connected to a logger with power/ground would suffice in a logging session... im not sure.. but someone here should know
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PostPosted: Sat Aug 19, 2006 7:04 pm    Post subject: Reply with quote

amazing post Very Happy Smile
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