PIC Microcontroler based Keyboard Input

• Debounce KeySwitches with optional Push On/Off by Mike K8LH
• 3x4 Keyboard decoder by Chris Camerlin [camerlin at ovis.net] and Micheal Rigby Jones
• 3x4 Keypad Lock w/ 4 bit LCD by Bert Botha
• 4x4 Keypad for PIC 16x84 by Tom McGahee
• 4x4 Keypad Standard Scanning with 8 io pins
• 4x4 keyboard with only 4 io pins (8 diodes)
• 4x4 Keypad with 1 A/D pin (7 1% resistors)
• 7 switches with 1 A/D pin by Bob Axtell
• Input Multiplexing using 74HC251 or 4051 by Jinx
• Reading isolated switches

PC (PS2) Keyboard

• Jinx PC Keyboard Capture and Emulation using a PIC 18F1320
• Tony Kubek's pickbd2 PC-Keyboard emulator using a PIC16F84

Also:

• PIC Debounce
• Keyboard Encoding / Decoding
• PC Keyboards
• General Switch Debounce

See also:

• http://www.electronic-engineering.ch/microchip/projects/projects.html#kbd_if_3xx PS2
• http://www.bytecraft.com/touch.html A Touch Sensitive Circuit
• Scott Dattalo: Tweaking a PIC for debounce,
• http://www.mbhs.edu/~ojenkins/wearable/fiddler.html (Basic Stamp unit)
• http://www.hth.com/filelibrary/TXTFILES/keyboard.txt
• http://ourworld.compuserve.com/homepages/steve_lawther/keybinfo.htm keyboard to LCD display keyboard code viewer, with diagram etc.
• http://boole.stanford.edu/~gdefouw/kbd/pic.html (PIC 16C84 Keyboard Transmit Routine)
• http://www.arne.si/~mauricio/PIC.HTM
• http://www.geocities.com/SiliconValley/Bay/8302/keybrd.htm
• http://www.phlat.com/din/ad_MiniDinToDinKeyboard.html
• http://www.brouhaha.com/~eric/pic/
• http://www.mikerj.clara.net/keypad.html

Archive:

• PICList post "CHALLENGE: 4x4 keyboard and LCD with 1 port = 8 bits"
• PICList post "4x4 Keypad and LCD in 1 port" bert botha of Kulkoni-ITS South Africa replies: Please see my 3x4 keypad w/LCD to get an idea..

Questions: