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Our reason for writing this was to examine another way to get more output pins when using an Arduino or compatible board. However you can use any combination of three logic lines to turn on or off eight mutually exclusive outputs.
If you leave E3 low, no outputs can be set to high. The input combination required for each output is described in this table from the data sheet: Notice that columns with an X can be set either high or low, but you must not leave them floating, so always connect or set an X to high or low.
If you need to have active low outputs that is, outputs are high instead of low , there is the 74HC So now to do this in real life! Although only one output can be high at a time, if you scan them quick enough, you can create the illusion that all are on at once as in the video. Apart from LEDs and other items, you could use this IC to control stepper motors or even create a safe working environment on a model train layout. To conclude, the 74HC offers one of several ways to control more things with less control pins.
Ideal for mutually exclusive outputs, however if you needed more than one high at once, the 74HC shift register would be the better solution. To keep up to date with new posts at tronixstuff.
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