The Mux: Difference between revisions
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A new PIC, a PIC18F2455 using a 20MHz crystal, has replaced this PIC through use of an extra 'daughter' board. This change in PIC was to allow easier coding, using C instead of assembler, and to provide USB capabilites. The source code can be found in [[Main Mux Source Code]]. | A new PIC, a PIC18F2455 using a 20MHz crystal, has replaced this PIC through use of an extra 'daughter' board. This change in PIC was to allow easier coding, using C instead of assembler, and to provide USB capabilites. The source code can be found in [[Main Mux Source Code]]. | ||
Six 74HC595 shift registers are daisy chanined together to form a single large serial-to-parallel converter to control all of the LEDs and the buzzer. The data is shifted in in the following order, with high to turn the LED/buzzer on: | |||
{|border="1" | |||
|+ ''Shift register output, leftmost exits chip first'' | |||
|Bottom Row Right LED | |||
|. | |||
|. | |||
|. | |||
|Bottom Row Left LED | |||
|2nd Row Right LED | |||
|. | |||
|. | |||
|. | |||
|2nd Row Left LED | |||
|3rd Row Right LED | |||
|. | |||
|. | |||
|. | |||
|3rd Row Left LED | |||
|Top Row Right Green LED | |||
|. | |||
|. | |||
|. | |||
|Top Row Left Green LED | |||
|Mux4 LED | |||
|Mux3 LED | |||
|Mux2 LED | |||
|Mux1 LED | |||
|Obey LED | |||
|Not Used | |||
|Not Used | |||
|Not Used | |||
|Buzzer | |||
|7-seg Top | |||
|7-seg Top Right | |||
|7-seg Bottom Right | |||
|7-seg Bottom | |||
|7-seg Bottom Left | |||
|7-seg Middle | |||
|7-seg Top Left | |||
|} | |||