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6 linked leds with 6 SPMom switches control

Discussion in 'LEDs and Optoelectronics' started by mollongghip, Feb 14, 2010.

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  1. mollongghip


    Feb 14, 2010
    Having difficulty even thinking of a way to do this, years out of electronics as a hobby.
    Looking to control 6 LEDS such that a single press on a single pole momentary switch will simultaneously extinguish any lit LED and light the LED above the switch.

    Think a row of six LEDS with six switches underneath. Press button 3 and LED3 lights, any other lit LED extinguishes.

    Any help appreciated, prefer discrete, however logic is OK -- definitely no microcontrollers, can do it that way but looking for simplicity.
    Thanks in advance


    ## Thinking about it it could be similar to a six input av switch with push buttons selecting the source -- effectively driving the led rather than passing a signal -- any takers -- I'm googling away
    Last edited: Feb 14, 2010
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Is this for some application like a "quiz button" or similar to indicate who hit the button first?

    Or do you want it to indicate the last button pressed? (It seems like the latter)

    Here is something I whipped up. It would probably work.

    It would start up with LEDs lit randomly. If you press the button for any LED not lit, the 2 gates IC1a and IC1b which form a bistable will change state, turning on the LED. Simultaneously a pulse will reset all other bistables.

    Oops, I should press the submit button I guess (having written this several hours ago :) )

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