leds light up circuit needed? - Electronic Circuits Projects Diagrams Free

cestudent · 26th November 2008, 04:16 PM

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 ?

ormo · 26th November 2008, 04:58 PM

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

Ubergeek63 · 26th November 2008, 05:24 PM

CircuitDB | 16 Stage Bi-Directional LED Sequencer theres a starting point

audioguru · 26th November 2008, 07:05 PM

A CD4017 can show LEDs sequencing one way directly and sequencing the other way through diodes.

Ubergeek63 · 26th November 2008, 07:22 PM

Quote:

Originally Posted by audioguru

A CD4017 can show LEDs sequencing one way directly and sequencing the other way through diodes.

if you do not mind being limited to 5 lamps

audioguru · 26th November 2008, 08:31 PM

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.

cestudent · 27th November 2008, 08:46 PM

thank u " ormo , Ubergeek63 & audioguru" for ur help

but i have a question , can i control this chip with Pic with up/down sequence??

blueroomelectronics · 27th November 2008, 09:28 PM

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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26th November 2008, 04:16 PM	#1
cestudent	leds light up circuit needed? 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 by cestudent; 26th November 2008 at 04:18 PM.

26th November 2008, 04:58 PM	#2
ormo	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 __________________ I don't necessarily understand it, I just talk a lot...

26th November 2008, 05:24 PM	#3
Ubergeek63	CircuitDB \| 16 Stage Bi-Directional LED Sequencer theres a starting point

26th November 2008, 07:05 PM	#4
audioguru	A CD4017 can show LEDs sequencing one way directly and sequencing the other way through diodes. __________________ Uncle $crooge

26th November 2008, 08:31 PM	#6
audioguru	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. __________________ Uncle $crooge

27th November 2008, 08:46 PM	#7
cestudent	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 by cestudent; 27th November 2008 at 08:49 PM.