projects:electronics:7segdisplay

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projects:electronics:7segdisplay [2008/05/22 21:46] – photonicsguyprojects:electronics:7segdisplay [2014/11/13 14:37] (current) – photonicsguy
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 {{:projects:electronics:7segdisplay:display_working.jpg?400 |Working Display}} {{:projects:electronics:7segdisplay:display_working.jpg?400 |Working Display}}
  
 +<note>**Arduino library available on [[https://github.com/Photonicsguy/SAA1064|Github]]**</note>
 This was one of my first doublesided and surfacemount boards. I made this board using Eagle for layout and then I used [[http://www.batchpcb.com|BatchPCB]] to manufacture the board. The board operates correctly, however, if I were to revise it, I would use a larger SMT resistor than the 0402 size. The board will be controlled via I2C from a PIC microcontroller, initially for the pressure sensor and later for other projects. This was one of my first doublesided and surfacemount boards. I made this board using Eagle for layout and then I used [[http://www.batchpcb.com|BatchPCB]] to manufacture the board. The board operates correctly, however, if I were to revise it, I would use a larger SMT resistor than the 0402 size. The board will be controlled via I2C from a PIC microcontroller, initially for the pressure sensor and later for other projects.
  
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 [[projects:electronics:7segdisplay:Schematic]] [[projects:electronics:7segdisplay:Schematic]]
  
-C1 is 2.7nf (2700pf)+C1, 2.7nf (2700pf)
  
-R1=R2=220Ohms+R1,R2 = 220 Ohms
  
 {{:projects:electronics:7seg.jpg?200| }} {{:projects:electronics:7seg.jpg?200| }}
  
-==== Constants ==== +====== Constants ====== 
- ; SAA1064 Constants +<file mpasm saa1065const.asm> 
- SAA1064ADDRESS EQU B'01110000' ; I2C Address +; SAA1064 Constants 
- SAA1064CONTROL EQU B'00000111' ; Control, bits 6:4 are for brightness +SAA1064ADDRESS EQU B'01110000' ; I2C Address 
- SAA1064SEGDASH EQU B'01000000' ; - +SAA1064CONTROL EQU B'00000111' ; Control, bits 6:4 are for brightness 
- SAA1064SEGDP EQU B'10000000' ; . +SAA1064SEGDASH EQU B'01000000' ; - 
- SAA1064SEGJ EQU B'00011110' ; J +SAA1064SEGDP EQU B'10000000' ; . 
- +SAA1064SEGJ EQU B'00011110' ; J 
-==== PIC18 assembly code lookup table ==== +</file>
- ;Lookup Table for 7-seg +
- ;TODO Add test to make sure number is 0x0F or below +
- ;DP is Bit 7 +
- SEG_LOOKUP +
- MOVWF Temp,A +
- MOVLW 0x10 +
- SUBWF Temp,A +
- BTFSC STATUS,C +
- RETLW B'11000000' ; Return 0xC0 if over 0x0F - Light up DP and G segments +
- BCF STATUS,C +
- RLCF Temp,w +
- ADDWF PCL,F +
- RETLW B'00111111' ; 0 +
- RETLW B'00000110' ; 1 +
- RETLW B'01011011' ; 2 +
- RETLW B'01001111' ; 3 +
- RETLW B'01100110' ; 4 +
- RETLW B'01101101' ; 5 +
- RETLW B'01111101' ; 6 +
- RETLW B'00000111' ; 7 +
- RETLW B'01111111' ; 8 +
- RETLW B'01100111' ; 9 +
- RETLW B'01110111' ; A +
- RETLW B'01111100' ; B +
- RETLW B'01011000' ; C +
- RETLW B'01011110' ; D +
- RETLW B'01111001' ; E +
- RETLW B'01110001' ; F +
- ;End of Lookup+
  
 +====== PIC18 assembly code lookup table ======
 +<file mpasm saa1065lookup.asm>
 +;Lookup Table for 7-seg
 +;TODO Add test to make sure number is 0x0F or below
 +;DP is Bit 7
 +SEG_LOOKUP
 + MOVWF Temp,A
 + MOVLW 0x10
 + SUBWF Temp,A
 + BTFSC STATUS,C
 + RETLW B'11000000' ; Return 0xC0 if over 0x0F - Light up DP and G segments
 + BCF STATUS,C
 + RLCF Temp,w
 + ADDWF PCL,F
 + RETLW B'00111111' ; 0
 + RETLW B'00000110' ; 1
 + RETLW B'01011011' ; 2
 + RETLW B'01001111' ; 3
 + RETLW B'01100110' ; 4
 + RETLW B'01101101' ; 5
 + RETLW B'01111101' ; 6
 + RETLW B'00000111' ; 7
 + RETLW B'01111111' ; 8
 + RETLW B'01100111' ; 9
 + RETLW B'01110111' ; A
 + RETLW B'01111100' ; B
 + RETLW B'01011000' ; C
 + RETLW B'01011110' ; D
 + RETLW B'01111001' ; E
 + RETLW B'01110001' ; F
 +;End of Lookup
 +</file>
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