Hello,
I'm looking into building an 8x8 matrix and would like to activate each column one at a time. The pic I'd like to use only has 20 pins and I would only like to use three pins to control the columns. Now to do this I have bcd decoder (74HC/HCT42). But this decoder turns on 7 pins and turns 1 OFF and I'd like to the opposite??? Can I use the pin that is currently OFF as ground?
Thanks
I'm looking into building an 8x8 matrix and would like to activate each column one at a time. The pic I'd like to use only has 20 pins and I would only like to use three pins to control the columns. Now to do this I have bcd decoder (74HC/HCT42). But this decoder turns on 7 pins and turns 1 OFF and I'd like to the opposite??? Can I use the pin that is currently OFF as ground?
Thanks