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  • AlinA14 commented on chr's instructable LED Cube 8x8x85 months ago
    LED Cube 8x8x8

    Is there some other way other than gray coding in software to avoid 74HC138 glitches

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  • AlinA14 followed SuperTech-IT5 months ago
  • AlinA14 commented on chr's instructable LED Cube 8x8x85 months ago
    LED Cube 8x8x8

    hey can you please help me.IC 74hc138 is misbehaving. I suspect it to be race hazard.Wrong latches are being selected by the address selecter.the following sequence seems to fix the proplem.void draw(char *buffer){ PORTB=0b00001000; PORTA=buffer[0]; PORTB=0b00001001; PORTA=buffer[1]; PORTB=0b00001101; PORTA=buffer[5]; PORTB=0b00001100; PORTA=buffer[4]; PORTB=0b00001110; PORTA=buffer[6]; PORTB=0b00001010; PORTA=buffer[2]; PORTB=0b00001011; PORTA=buffer[3]; PORTB=0b00001111; PORTA=buffer[7]; PORTB=0b00001000; PORTB=0b00000000;}What I did was to change one logical state in the input to decoder at a time.some sites recommend temporary disabling of output to prevent race hazards.how did you deal with this issue>pls help

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