leds light up circuit needed?

C

cestudent

New Member
hello guys
how r u all?

am a new member here . i have a problem which i want to light up for example : 4 leds one by one " led1 on then led2 on ...." like this . i dont know how to do that . can anyone plz help with the circuit design coz i need it for my project
coz am doing lift project and i want these leds light up with the movement of the lift ?
 
Last edited:
If you just want a strip of 4 lights to light in sequence then have a look at the CMOS 4017. Connect outputs 1-4 to the LEDs and then link output 5 to the reset. Use a 555 timer or a crystal oscillator for the clock input
 
A CD4017 can show LEDs sequencing one way directly and sequencing the other way through diodes.
 
One CD4017 with diodes can light 6 LEDs back and forth.
More CD4017 ICs can be cascaded and with many more diodes to drive many more LEDs.
 
thank u " ormo , Ubergeek63 & audioguru" for ur help

but i have a question , can i control this chip with Pic with up/down sequence??
 
Last edited:
This is a Cylon / Knight Rider LED sequence written for my Junebug kit.
It flashes 6 charlieplexed LEDs using a PIC18F1320
Code: 
; DIP Switch (SW6) must have TUTOR on (SW6-1,2,3) all other switches off
list p=18F1320
include <p18F1320.inc>
CONFIG OSC = INTIO2, WDT = OFF, LVP = OFF
LED macro x,y ; MACRO LED <PORTA>, <TRISA>
    movlw x
    movwf LATA ; LATA = x
    movlw y
    movwf TRISA ; TRISA = y
    call Delay ; call the Delay subroutine
    endm ; end macro
Count equ 0 ; delay loop counter
    org 0 ; reset vector
    bsf ADCON1, 0 ; make RA0 digital
LED1  LED b'00000001', b'10111110' ; LED <PORTA>, <TRISA>
LED2r LED b'01000000', b'10111110' ; LED <PORTA>, <TRISA>
LED3r LED b'01000000', b'00111111' ; LED <PORTA>, <TRISA>
LED4r LED b'10000000', b'00111111' ; LED <PORTA>, <TRISA>
LED5r LED b'10000000', b'01111110' ; LED <PORTA>, <TRISA>
LED6  LED b'00000001', b'01111110' ; LED <PORTA>, <TRISA>
LED5l LED b'10000000', b'01111110' ; LED <PORTA>, <TRISA>
LED4l LED b'10000000', b'00111111' ; LED <PORTA>, <TRISA>
LED3l LED b'01000000', b'00111111' ; LED <PORTA>, <TRISA>
LED2l LED b'01000000', b'10111110' ; LED <PORTA>, <TRISA>
    bra LED1 ; loop forever
Delay decfsz Count, f ; decrement Count and skip when zero
    bra Delay ; not zero? repeat
    return ; return
END
 
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