projects:electronics:7segdisplay

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projects:electronics:7segdisplay [2008/06/01 23:23] – 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 
 +</file>
  
 ====== PIC18 assembly code lookup table ====== ====== PIC18 assembly code lookup table ======
- ;Lookup Table for 7-seg +<file mpasm saa1065lookup.asm> 
- ;TODO Add test to make sure number is 0x0F or below +;Lookup Table for 7-seg 
- ;DP is Bit 7 +;TODO Add test to make sure number is 0x0F or below 
- SEG_LOOKUP +;DP is Bit 7 
- MOVWF Temp,A +SEG_LOOKUP 
- MOVLW 0x10 + MOVWF Temp,A 
- SUBWF Temp,A + MOVLW 0x10 
- BTFSC STATUS,C + SUBWF Temp,A 
- RETLW B'11000000' ; Return 0xC0 if over 0x0F - Light up DP and G segments + BTFSC STATUS,C 
- BCF STATUS,C + RETLW B'11000000' ; Return 0xC0 if over 0x0F - Light up DP and G segments 
- RLCF Temp,w + BCF STATUS,C 
- ADDWF PCL,F + RLCF Temp,w 
- RETLW B'00111111' ; 0 + ADDWF PCL,F 
- RETLW B'00000110' ; 1 + RETLW B'00111111' ; 0 
- RETLW B'01011011' ; 2 + RETLW B'00000110' ; 1 
- RETLW B'01001111' ; 3 + RETLW B'01011011' ; 2 
- RETLW B'01100110' ; 4 + RETLW B'01001111' ; 3 
- RETLW B'01101101' ; 5 + RETLW B'01100110' ; 4 
- RETLW B'01111101' ; 6 + RETLW B'01101101' ; 5 
- RETLW B'00000111' ; 7 + RETLW B'01111101' ; 6 
- RETLW B'01111111' ; 8 + RETLW B'00000111' ; 7 
- RETLW B'01100111' ; 9 + RETLW B'01111111' ; 8 
- RETLW B'01110111' ; A + RETLW B'01100111' ; 9 
- RETLW B'01111100' ; B + RETLW B'01110111' ; A 
- RETLW B'01011000' ; C + RETLW B'01111100' ; B 
- RETLW B'01011110' ; D + RETLW B'01011000' ; C 
- RETLW B'01111001' ; E + RETLW B'01011110' ; D 
- RETLW B'01110001' ; F + RETLW B'01111001' ; E 
- ;End of Lookup + RETLW B'01110001' ; F 
 +;End of Lookup 
 +</file>
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