Help on Circuit

kogula14 · Mar 13, 2007

Hi. Currently i have to do a microp 8085 project. so i select to do a traffic controller circuit using 8085. Actually i try to start from basic so i found "THIS" diagram from website and upload it in attachment.My question is
- is it i have to add IC other than 8085 microp to make sure it function such as eeprom IC?
-what is the simple method that can be apply to edit the circuit that i upload?
- OR this circuit totally have to change if want use 8085 on it.

Thanks.

gregmcc · Mar 14, 2007

it would have to change completely - the circuit uses a 555 timer and a decade counter. The 8085 is a intel microprocessor. Does it have to be a microprocessor project - can you not use a microcontroller like the 16f628 or something similiar.

Update:
I see you've already posted a question about the traffic controller!!
https://www.electro-tech-online.com/threads/traffic-light-controller.27986/?highlight=traffic

blueroomelectronics · Mar 14, 2007

Kind of a strange circuit. You will always have the RED led lit if you light a GREEN or AMBER LED.

PS use a micro that can drive LEDs directly, like a PIC or ATMEL.

kchriste · Mar 15, 2007

Kind of a strange circuit. You will always have the RED led lit if you light a GREEN or AMBER LED.

Yes.... Just like a real traffic light. When the East/West traffic light is yellow or Green, the North/South traffic light is red...etc....

blueroomelectronics · Mar 15, 2007

In Canada we have double red in both directions for a moment. I built a fun traffic light for a display. Uses muxed LEDs on GPIO 2, 4 & 5 (3 wire, 6 LEDs)

Ugly code (first draft) but it works. Even does advance on flashing green.
g=flashing green

Sequence Rg, RG, RA, RR, gR, GR, AR, RR (repeat)

Code:

 ;LEDs are connected to GPIO 2,4 & 5
         list     p=12C508
         include <P12C508.inc>
         __CONFIG _WDT_OFF &_IntRC_OSC
         cblock 0x007
         d1
         d2
         Count                      ;loop counter
         LCount                     ;longer counter
         endc
         org        0
         movlw    b'11001110'
         option
Start
; Green will flash for 1/2 the time (Advance Green for Turning)
         movlw    .6
         movwf    LCount
         clrf        Count             ;Reset Count
RlGr    call        Red1              ;Red left
         btfss      LCount, 2
         goto       NoFlash
         btfsc      Count, 6
         call        Green2            ;Green on
         btfss      Count, 6
         call        LEDoff            ;All LEDs off
         goto      Done1
NoFlash  call     Green2
Done1    decfsz   Count
          goto     RlGr              ;Wait
          decfsz   LCount
          goto     RlGr
         
          movlw    .150
          movwf    Count             ;Loop count
RlAr     call     Red1              ;Red left
          call     Amber2            ;Green right  
          decfsz   Count
          goto     $-3             ;Wait
         
          movlw    .150
          movwf    Count             ;Loop count
RR       call     Red1              ;Red left
          call     Red2            ;Green right  
          decfsz   Count
          goto     $-3              ;Wait
                 
          movlw    .6
          movwf    LCount
          clrf      Count             ;Reset Count
RrGl     call      Red2              ;Red left
          btfss    LCount, 2
          goto     N_Flash
          btfsc    Count, 6
          call      Green1            ;Green on
          btfss    Count, 6
          call       LEDoff            ;All LEDs off
          goto     Done2
N_Flash  call     Green1
Done2    decfsz   Count
         goto     RrGl              ;Wait
         decfsz   LCount
         goto     RrGl
         
         movlw    .150
         movwf    Count             ;Loop count
RrAl     call     Red2              ;Red right
         call     Amber1           ;Green left
         decfsz   Count
         goto     $-3
         
;Red Red
         movlw    .150
         movwf    Count             ;Loop count
         call     Red1              ;Red left
         call     Red2            ;Green right  
         decfsz   Count
         goto     $-3              ;Wait
         
         goto     Start

Red1    movlw    b'11011011'       ;RED left
          tris    GPIO
          movlw    b'00100000'
          movwf    GPIO
          goto    R80ms

Red2    movlw    b'11001111'       ;RED left
          tris    GPIO
          movlw    b'00100000'
          movwf    GPIO
          goto    R80ms

Amber1    movlw    b'11101011'       ;Amber left
         tris    GPIO
         movlw    b'00010000'
         movwf    GPIO
         goto    R80ms

Amber2    movlw    b'11101011'       ;Amber right
         tris    GPIO
         movlw    b'00000100'
         movwf    GPIO
         goto    R80ms

Green1    movlw    b'11011011'       ;Green left
         tris    GPIO
         movlw    b'00000100'
         movwf    GPIO
         goto    R80ms

Green2   movlw    b'11001111'       ;Green right
         tris    GPIO
         movlw    b'00010000'
         movwf    GPIO
         goto     R80ms

LEDoff   movlw    b'11111111'       ;No LEDs
         tris    GPIO
         nop                        ;Timing 
         nop
         goto     R80ms       

R80ms    movlw    0x57                ;refresh loop 2x40ms
            movwf    d1
            movlw    0x03
            movwf    d2
Delay_0
           decfsz    d1, f
           goto    $+2
           decfsz    d2, f
           goto    Delay_0
            retlw    0
           end

kchriste · Mar 15, 2007

In Canada we have double red in both directions for a moment.

I've often wondered WHY we have that since most people are asleep at the light and do not wakeup until it's been green for 2-3 seconds anyway.

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