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PS/2 Keylogger based on
PIC12F675 - This is a keylogger based on PIC12F675 with
64K EEPROM ( 24LC512 ). When keylogger is connected between PC and keyboard it will record every keypress to
memory. By pressing a button recorded data will be sent back to PC so user can read it. No need. . .
Remote IR Terminal
- This unit provide 2 way IR communications using a numeric keypad and an LCD display. Data is sent and received
in ASCII with no regard to what the data means to any particular device.
. . . [Luhan Monat - Mesa Arizona]
RF pad - Differently from the usual combination locks, this circuit replaces RF remote controls.
Enter the correct combination to transmit a code compatible with the popular remotes based on the MM53200, UM3750
and UM86409 - and, of course, Nutchips. . . . [Alberto Ricci Bitti]
RS-232C port scans remote keypad - 12/04/97 EDN Design Idea In many embedded or control applications, you might prefer to use
a small, customized keypad with your PC-based system rather than a full-fledged alphanumeric keyboard. You may
also need to locate the keypad some distance from. . . [by SK Shenoy, NPOL, Kochi, India]
Scheme Improves On Low-Cost Keyboard - 10/30/03 EDN Design Idea You can easily improve on a previous Design Idea to produce a
slightly simpler resistor arrangement with better timing balance between switches, using a single resistor value
(Reference 1, Figure 1]. . . . [by Martin O'Hara, Telematica Systems Ltd, Cranfield, Bedfordshire, UK]
Security Circuit Eschews Sophistication - 05/26/94 EDN Design Idea Because of the many states involved in implementing sequential
combination locks, most designers use a microcontroller or a PLD. But for those die-hard discrete designers who
don't want to bother with debugging programs, here's a. . . [by Cheng Chen, AEG, Ajax, ON, Canada]
Security Keypad - This Electronic Code Lock uses a 12-keys keypad is used to enter a password and open an
electrick lock or any other device with a signal. Uses an 8-pin PIC 12F629. . . . [Jose Pino designer]
Security Keypad II - An improved version that can be used on security vaults, Doors with electric latches,
Alarms, Safety devices and many other uses. It uses an HITACHI LCD (16x1 or 8x1) and a matrix keypad. The HEX
code is available for 16F84A and 16F628. . . . [Jose Pino]
Ser-Key 10-Key Serial Keypad Encoder - Schematic only, no circuit description. . . [Reynold's Elec]
Single-wire keypad interface frees microcontroller-I/O pins - 03/31/05 EDN Design Idea Using this interface topology, you can reduce the number of
keypad interface wires to just one and thus save critical microcontroller I/O ports. . . [by Israel Schleicher,
Prescott Valley AZ]
Sun Type 5 keyboard on the PC - Many people have dreamed of having their Sun Type 5 keyboard attached to their PC. Now with
this adapter, it is finally possible. Because the standard Sun keyboards use TTL RS232 at 1200 bps to talk to the
Suns, it's relatively easy to make them talk to any non-Sun computer by converting this to true RS232. However
PC's don't understand keyboards hooked up to serial ports without special drivers. While such drivers do exist
you will still need to keep a PC keyboard about if you want to change the BIOS setup etc. . . [Jonathan A.
Buzzard] |
