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Help me make a stand-alone 4x4 keypad

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sdf123

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Hello everyone,

I am working on a keypad logger DIY project which is quite simple to someone with experience, but for a newbie like me, it's a hughe task, so I hope someone can help me out a little bit.

The target of the project is like this:

Make a stand-alone 4x4 keypad with battery and circuit which can record the every keystroke on the keypad and with time stamp. The data will then be transfered to computer after certain amount of data has been recorded. The connection method can be usb, rs232 etc. Also the circuit board is expected to be as small as possible to fit in the keypad casing.

Thank you.
 

24lc02 connect to rs232

One of the easiest way to go is to use PICAXE-18X (PIC microcontroller with BASIC interpreter) ..
Its BASIC dialect includes I2C commands, so you can easily connect RTC (Real time clock) such as DS1307 (or similar) and EEPROM (memory) 24LCXX-series (for example 24LC02 - 256 bytes) ..
This microcontroller connects directly to PC's serial port and does not require any RS-232 driver IC or any special programmer ..
It has enough pins to connect 4x4 keypad, and writing program in BASIC - even if at this stage you may not have any experience in it - will take something like a couple of hours ..

All info on this dirt cheap but powerful & exceptionally easy to use microcontrollers you can find at:
**broken link removed**

Regards,
IanP
 

    sdf123

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