Thursday, March 11, 2010
upload test (1x)PIC16F887A [Microntroller Unit, storage everything and process everything] (1x)20mhz crystal [clock source for the processor] (1x) LM317 [power supply for LED, and LED brightness control] (1x) 10K pot [adjust voltage on the LM317 IC for LED brightess control] (1x) 220ohm resistor [feedback for LM317 IC operation} (1x) 78L05 100ma fix 5V regulator [PIC power supply] (2x) 18pf capacitor [crystal filter] (3x) SN75468 IC [21 column LED cathod current sink] (8x) PN2907A [8 row LED anode current source] (4x) NO pushbutton [for changing menu and character setup] (4x) 0.1uf capacitors [filter noise on pusbutton switch] (1x) 2200uf 10V capacitor [5-voltage line filter] (1x) 8pair-DIP switch (for change mode from programming the PIC to normal operation and also in future, for cascading multiple board ]
http://www.youtube.com/watch?v=ZqFMbjsWD4E&hl=en
