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L298N logic 0 help

Discussion in 'General Electronics Discussion' started by dizwold, Nov 14, 2013.

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  1. dizwold


    Nov 14, 2013
    Hi. I'm looking at using a L298N motor driver to power 2x 3v motors for a walker type robot. I would like to control it from 4 spst analogue switches, ie 1 for forward, 1 for back, 1 for left and 1 for right, thus moving the motors accordingly. I will be using a 6v circuit, but how would I get a logic 0 to apply to the 2nd I/P as I would need a logic 1 to I/P 1 and logic 0 to I/p 2 and visa-versa and the same on the other side of the H bridge?
    Could anyone please help and advise?
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    To get a logic 0, tie the input to 0V, for a logic 1, tie it to Vcc.

    If you want to do this via a switch, use the switch to connect the input to the appropriate rail and wire a resistor (1k should be fine) from the input to the other rail.

    This means that pressing the switch will assert the desired logic level.
  3. dizwold


    Nov 14, 2013
    Nice 1 Steve, never thought of that, have been getting my head in a twist looking at multiplexers and stuff. 20 years without touching a soldering iron, maybe I should leave it that way. LOL.
    Cheers Steve, thanks for the post.
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